RussellMc
2021-05-25 13:53:32 UTC
Utterly superb WT design site.
Designs are largely low wattage and targeted at small developing country
use for water-pumping or electricity generation.
https://kdwindturbines.nl/?fbclid=IwAR02Yl_eoXqUe4HyMgm95MLXpktVcNO_ESoWa4U1XjCBa6swjVC2jRx4eqA
*Index*
https://kdwindturbines.nl/wp-content/uploads/2021/05/List-public-KD-reports.pdf
*Reports - all links*
https://kdwindturbines.nl/kd-reports/
*Bio / overview*
https://kdwindturbines.nl/wp-content/uploads/2019/08/KD-folder-August-2019.pdf
*Sequence of reports for self study*
https://kdwindturbines.nl/wp-content/uploads/2021/05/Sequence-of-KD-reports-for-self-study.pdf
_______________
Contact
Engineering Office Kragten Designing. Adriaan Kragten
Populierenlaan 51
5492 SG Sint-Oedenrode
The Netherlands
Telephone: + 31 (0)413 475770
E-mail: ***@kdwindturbines.nl
__________________________
*Memoirs of a motorcycle mechanic :-)*
https://kdwindturbines.nl/wp-content/uploads/2015/01/Memoirs-of-a-motorbike-mechanic.pdf
===================================
Overview of free public KD-reports of engineering office Kragten Design
(KD) 24 May 2021
All reports are in English except KD 35 which is available in English and
in Dutch and KD 709 and KD 713 which are in Dutch. The author of all
reports is ing. (B.Sc.) Adriaan Kragten. e-mail: ***@kdwindturbines.nl
website: www.kdwindturbines.nl.
Report title, year number number of pages
KD 35 Rotor design and matching for horizontal axis wind turbines, January
1999, reviewed February 2017. 62
KD 35 Nederlands Rotorontwerp en matching voor horizontale as windturbines,
februari 2017. 62
KD 78 Measurements performed on a generator with housing 5RN90L04V and a
4-pole armature equipped with neodymium magnets, March 2001, reviewed March
2015. 25
KD 82 Measurements performed on a generator with housing 5RN132M04V with a
standard 400/690 V winding provided with a 4-pole armature with neodymium
magnets, June 2001. 18
KD 97 Determination of Cq for low values of . Deriving the Cp- and Cq-
curves of the VIRYA-1.8D rotor, July 2002, reviewed January 2020. 10
KD 196 Questions and answers on a wind energy course based on report KD 35,
“Rotor design and matching for horizontal axis wind turbines”, In English
and in Dutch (Nederlands), May 2004. 12
KD 200 Measurements performed on a generator with housing 5RN112M04V and a
4-pole armature equipped with neodymium magnets, June 2004, reviewed
September 2016. 17
KD 213 Method to check the estimated -V curve of the hinged side vane
safety system and checking of the -V curve of the VIRYA-4.2 windmill,
December 2004. 28
KD 215 The Darrieus rotor, a vertical axis wind turbine (VAWT) with only a
few advantages and many disadvantages, December 2004 5
KD 223 Method to check the estimated -V curve of the hinged side vane
safety system and checking of the -V curve of the VIRYA-3.3D windmill
(7.14 % cambered steel blades), February 2005. 28
KD 235 Use of the VIRYA-3.8 windmill for water pumping with a pump equipped
with a permanent magnet DC motor, July 2005. 10
KD 285 The Gö 711 airfoil for use in windmill rotor blades, June 2006,
reviewed February 2010. 6
KD 294 Coupling of a windmill to a single acting piston pump by means of a
crank mechanism, September 2006. 13
KD 319 Calculations executed for the 4-bladed rotor of the VIRYA-2.8B4
windmill (d = 2.5, galvanised steel blades), February 2007, reviewed
January 2020. 15
KD 320 Development of the VIRYA-2.8B4, a windmill with a Polycord
transmission in between the rotor shaft and the vertical shaft to drive a
rope pump or an Archimedian screw pump, February 2007. 21
KD 321 Combination of the VIRYA-2.8B4 windmill with a rope pump, February
2007. 13
KD 333 The Gö 711 airfoil modified as the Gö 711-12% and the Gö 711-10%
airfoil for use in windmill rotor blades (contains also characteristics of
the Gö 795, 796 and 797 airfoils), May 2007, reviewed May 2016. 11
KD 340 Rectification of 3-phase VIRYA windmill generators, May 2007,
reviewed April 2017. 15
KD 341 Development of the permanent magnet (PM) generators of the VIRYA
windmills, May 2007, reviewed May 2021. 25
KD 364 Derivation of the formulas for torque and volumetric efficiency for
a single acting piston pump with a floating valve, November 2007, modified
May 2008. 9
KD 377 Development of a tornado proof pendulum safety system for a medium
size wind turbine which turns the rotor out of the wind along an horizontal
axis, April 2008, reviewed November 2019. 17
KD 378 Basic knowledge about electrical, chemical, mechanical, potential
and kinetic energy to understand literature about the generation of energy
by small windmills, May 2008. 15
KD 398 The 7.14 %, 10 % and 12.5 % cambered plate as airfoil for windmill
rotor blades. Aerodynamic characteristics, geometry, moment of inertia I
and moment of resistance W. November 2008. 13
KD 409 Development of an ecliptic safety system with a torsion spring,
February 2009, reviewed May 2016. 22
KD 416 Windmills using aerodynamic drag as propelling force; a hopeless
concept, April 2009, reviewed September 2019. 11
KD 417 The rotating blade, vertical axis wind turbine, April 2009, reviewed
November 2015, 10
KD 431 Description of the inclined hinge main vane safety system and
determination of the moment equations, December 2009. 19
KD 437 Ideas about a pitch control system for the VIRYA-15 windmill (d =
8, Gö 711 airfoil), February 2010. 23
KD 439 Development of a pendulum safety system with a torsion spring and e
= 0.2 R, March 2010, reviewed April 2021. 17
KD 463 The Gö 622, Gö 623, Gö 624 and Gö 625 airfoils with thickness/chord
ratios of respectively 8 %, 12 %, 16 % and 20 % for use in windmill rotor
blades, August 2011, reviewed January 2020. 13
KD 465 Calculations executed for the 2-bladed rotor of the VIRYA-1.5
windmill (d = 4.5, steel blades) with generator frame size 71 and original
motor shaft, August 2011, reviewed October 2018. 16
KD 484 Calculations executed for the 3-bladed rotor of the VIRYA-3B3
windmill (d = 6.5, wooden blades), February 2012, reviewed November 2018.
20
KD 485 Safety systems for small wind turbines which turn the rotor out of
the wind at high wind speeds, February 2012, reviewed May 2016. 24
KD 490 Water pumping with a windmill, March 2012, reviewed August 2020. 10
KD 491 Research to the usability of the Solaflux pump with a 2.6 mm cam in
combination with the VIRYA-3B3 windmill, March 2012, reviewed October 2018.
11
KD 501 Determination of the Cm- curves for different positions of the axis
of rotation for a 10 %, 5 % and 7.14 % cambered airfoil with an aspect
ratio of 5, July 2012, reviewed April 2018. 10
KD 503 Development of an alternative permanent magnet generator for the
VIRYA-3 windmill using an Indian 4-pole, 3-phase, 2.2 kW asynchronous motor
frame size 100 8
and 8 neodymium magnets size 50 * 25 * 10 mm, September 2012, reviewed
December 2019.
KD 518 Calculations executed for the 3-bladed rotor of the VIRYA-1.04
windmill (d = 3.5, 7.14 % cambered, aluminium blades) meant to be coupled
to a Nexus hub dynamo (with free manual), Jan. 2013, reviewed May 2013. 16
KD 522 Ideas about a 4-pole, 3-phase axial flux permanent magnet generator
for the VIRYA-1.5 windmill using square neodymium magnets size 30 * 30 * 15
mm and no iron in the stator, June 2013. 11
KD 531 Ideas about a 16-pole, 3-phase axial flux permanent magnet generator
for the VIRYA-3B2 windmill using 16 neodymium magnets size 50 * 15 * 15 mm,
Sept. 2013 12
KD 532 Calculations executed for the rotor of the VIRYA-3.1 windmill (d =
7, Gö 623 airfoil), with 2-bladed rotor made of Roofmate and glass fibre,
September 2012, reviewed February 2020. 18
KD 539 Ideas about a fast running vane pump directly driven by a 0.37 kW,
4-pole asynchronous motor frame size 71, December 2013, reviewed September
2018. 15
KD 542 Ideas about a diaphragm pump with three in line diaphragms driven by
a 0.37 kW asynchronous 4-pole motor or a permanent magnet DC motor frame
size 71 and a of manufacture Rossi, January 2014. 14
KD 544 Ideas about a double piston pump with a constant upwards piston
speed driven by an asynchronous 4-pole, 3-phase motor or a permanent magnet
DC motor frame size 71 reducing gear box frame size 32 15
of manufacture Rossi, January 2014, reviewed May 2016.
KD 551 Aerodynamic characteristics of rectangular flat plates with aspect
ratios 5 : 1, 2 : 1, 1 : 1, 1 : 2 and 1 : 5 for use as windmill vane
blades, March 2014, reviewed September 2020. 21
KD 560 Ideas about a direct drive 34-pole permanent magnet generator for
the VIRYA-3.3S windmill using the stator stamping of an Indian 6-pole,
3-phase, 2.2 kW asynchronous motor frame size 112 9
and 51 neodymium magnets size 40 * 10 * 5 mm, May 2014, reviewed December
2017.
KD 562 Development of a tubular tower for the VIRYA-3.3S windmill, June
2014, reviewed December 2014, 8
KD 571 Development of an 8-pole, 3-phase axial flux permanent magnet
generator for the VIRYA-1.36 windmill using 8 neodymium magnets size 25.4 *
25.4 * 12.7 mm. November 2014, modified April 2017. 20
KD 576 Calculations executed for the 3-bladed rotor of the VIRYA-3.3S
windmill (d = 4.5, steel blades) using a 34-pole PM-generator for coupling
to a pump motor, December 2014. 16
KD 578 Calculations executed for the 3-bladed rotor of the grid connected
VIRYA-6.5 windmill (d = 6, Gö 711 airfoil, wooden blades) provided with
the hinged side vane safety system, February 2015, reviewed January 2016. 12
KD 579 Extended calculations executed for the grid connected VIRYA-6.5
windmill, March 2015, reviewed March 2018. 24
KD 580 Ideas about a small 34-pole permanent magnet generator for a small
windmill or for human power, using the stator stamping of a 6-pole
asynchronous motor frame size 80 ------, March 2015, reviewed May 2021. 12
KD 582 Development of a tubular tower for the VIRYA-4.2 and the
VIRYA-4.6B2, March 2015, reviewed November 2016. 10
KD 595 Measurements performed on a Chinese axial flux generator of Hefei
Top Grand model TGET165-0.15kW-500R for a 12 V battery load, September
2015. 12
KD 596 Ideas about a 12-pole axial flux generator for the VIRYA-1.66
windmill using 12 neodymium magnets size 25.4 * 25.4 * 12.7 mm. Design
report of the rotor. October 2015, reviewed February 2016. 19
KD 598 Ideas about the 3-bladed VIRYA-0.65 water turbine with 20° inclined
shaft coupled to the generator of the VIRYA-2.68 windmill for 12 V and 24 V
battery charging. 19
Ideas about an alternative 2-bladed VIRYA-0.625, November 2015, reviewed
June 2018.
KD 599 Measurements of Savonius rotors available on the Internet, December
2009, reviewed August 2019. 7
KD 601 Ideas about a self starting, 3-bladed H-Darrieus rotor for water
pumping, December 2015, reviewed August 2019. 9
KD 614 Calculations executed for the 2-bladed rotor of the VIRYA-5 windmill
(d = 7, Gö 711 airfoil) meant for connection to a 34-pole PM-generator for
driving the 1.1 kW asynchronous motor of a centrifugal pump. 24
Description of the 34-pole generator. August 2016, reviewed November 2016.
KD 615 Calculations for the 3-bladed rotor of the VIRYA-0.98 windmill (d =
3, 15° folded aluminium blades) meant to be coupled to a Nexus hub dynamo,
September 2016 12
KD 616 Translation of parts of report R343D of June 1978 from Dutch into
English. R343D gives wind tunnel measurements for a rotor with tapered
blades-- November 2016 12
KD 617 Design report of the VIRYA-2.02 rotor (d = 6, B = 2, tapered
stainless steel blades), November 2016. 10
KD 622 Ideas about a pitch control mechanism for the 2-bladed rotor of the
VIRYA-5 windmill (d = 7, Gö 711 airfoil) meant for connection to a 34-pole
PM-generator for driving an asynchronous motor of 26
a centrifugal pump. Description of the 34-pole generator, December 2016.
KD 624 Ideas about a direct drive 46-pole PM-generator for the VIRYA-6.5
windmill meant for driving the 2.2 kW asynchronous motor of a centrifugal
pump, January 2017. 12
KD 631 Development of an 8-pole, 3-phase axial flux permanent magnet
generator for the VIRYA-1.81 windmill using 8 neodymium magnets size 45 *
15 mm and a stator made out of synthetic material. 17
Calculation of the rotor geometry, April 2017.
KD 632 Ideas about a 26-pole permanent magnet generator for the VIRYA-2.2
windmill using the housing of a 4-pole, 3-phase, 0.75 kW asynchronous motor
frame size 80 17
and 26 neodymium magnets size 40 * 7 * 3 mm. Design report of the rotor (d
= 4.75, B = 2, galvanised steel blades), May 2017, reviewed May 2021.
KD 644 Ideas about an 8-pole, 3-phase permanent magnet generator with a
stator without iron in the coils, using eight neodymium magnets size 80 *
20 * 10 mm and a housing of an asynchronous motor with frame size 71, 9
November 2017, reviewed November 2018.
KD 645 Ideas about a 10-pole, 3-phase permanent magnet generator with a
stator without iron in the coils, using 20 neodymium magnets size 50 * 20 *
10 mm and a housing of an asynchronous motor with frame size 80, June 2019.
12
KD 648 Ideas about a 38-pole permanent magnet generator for the VIRYA-3B3
windmill using the housing of a 6-pole, 3-phase, 1.5 kW asynchronous motor
frame size 100 and 57 neodymium magnets size 40 * 7 * 3 mm, December 2017. 9
KD 651 Calculations executed for the 4-bladed rotor of the VIRYA-3.6L2
windmill (d = 2, galvanised steel blades) with a Polycord transmission in
between the rotor shaft and the vertical shaft 23
to drive a rotating positive displacement pump, March 2018, reviewed
October 2018.
KD 654 Calculations executed for the 3-bladed rotor of the VIRYA-3.6PC
windmill (d = 4.5, galvanised steel blades) driving the VIRYA-4.2
PM-generator for 26 V star or driving a centrifugal pump 20
through a rectangular gear box and a vertical shaft in the tower.
Description of the pitch control safety system, April 2018.
KD 656 Calculations executed for the 2-bladed rotor of the VIRYA-2.92 (d =
6, stainless steel tapered blades) driving the VIRYA-2.68 PM-generator for
24 V battery charging, June 2018. 18
KD 658 Calculations executed for an alternative rotor of the VIRYA-4.2
windmill (d = 6.5, Gö 711 airfoil) used for 24 V battery charging, June
2018. 17
KD 661 Ideas about a vane pump for low height irrigation directly driven by
a 24 V, 0.35 kW, permanent magnet DC motor frame size 71, October 2018. 17
KD 662 The VIRYA-0.45, a small wind turbine for practical tests by students
in the class room, October 2018. 9
KD 664 Calculations executed for the 2-bladed rotor of the VIRYA-1.8W
windmill (d = 6.25, wooden blades) used in combination with an 8-pole
permanent magnet generator frame size 71 with a stator with no iron in the
coils, Nov. 2018 12
KD 667 Ideas about a 12-pole permanent magnet generator using a motor
housing frame size 100 and a stator with no iron in the coils for use in
combination with the VIRYA-3B3 rotor, November 2018 12
KD 668 Ideas about a 24-pole permanent magnet generator with a stator with
no iron in the coils for the alternative VIRYA-4.2 rotor for battery
charging or for combination to the1.1 kW, 3-phase asynchronous motor of a
centrifugal pump, 14
December 2018, reviewed January 2019.
KD 669 Calculations executed for the 2-bladed rotor of the VIRYA-1.75W
windmill (d = 7, wooden blades) with a Chinese axial flux generator of
Hefei Top Grand model TGET165-0.15KW-500R used for 12 V, December 2018. 12
KD 670 Calculations executed for the 3-bladed rotor of the VIRYA-5.2
windmill (d = 6, Gö 711 airfoil, wooden blades) provided with the hinged
side vane safety system, February 2019, reviewed October 2019. 18
KD 671 Translation of parts of report R-668-A “Optimalisering van een
windservo” (Optimization of a wind servo) from Dutch into English. Ideas
about the VIRYA-2B8, February 2019. 12
KD 672 Use of the VIRYA-1, the VIRYA-1.02 or the VIRYA-1.04 for pumping of
drinking water using a 12 V battery and a pump with a 12 V, DC motor. May
2019, reviewed August 2019. 8
KD 678 Calculations executed for the 3-bladed rotor of the VIRYA-1.02
windmill (d = 3.5, 15° folded stainless steel blades) meant to be coupled
to the VIRYA-1 generator, June 2019, reviewed December 2019. 19
KD 679 Development of an 8-pole, 3-phase axial flux permanent magnet
generator for the VIRYA-1 windmill using a bicycle hub and 8 neodymium
magnets size 25 * 12 mm -----, September 2019, reviewed December 2019. 22
KD 681 Ideas about an 8-pole, 3-phase permanent magnet generator using the
housing of an asynchronous motor frame size 80 and four neodymium magnets
size 80 * 20 * 10 mm with a magnet orientation 9
such that the fluctuation of the sticking torque is minimal, October 2019.
KD 683 Ideas about a 4-pole, 3-phase permanent magnet generator using the
housing of an asynchronous motor frame size 80 and four neodymium magnets
size 80 * 20 * 10 mm with a magnet orientation 11
such that the fluctuation of the sticking torque is minimal, October 2019,
reviewed December 2019.
KD 684 Derivation of the formula for the cone angle for a constant chord
blade which is connected to the hub by a hinge, October 2019. 6
KD 690 Ideas about a 4-pole permanent magnet generator for the VIRYA-2S
windmill using the housing of a 4-pole, 3-phase, 0.75 kW asynchronous motor
frame size 80 and 4 neodymium magnets size 80 * 20 * 10 mm. 15
Design report of the rotor (d = 4.5, B = 3, stainless steel blades),
December 2019.
KD 693 Calculations executed for the 4-bladed rotor of the VIRYA-3.5
windmill (d = 4, ss blades) meant to drive a centrifugal pump through a
Polycord transmission with an accelerating gear ratio 2.5 : 1 and a
vertical shaft in the tower,Jan ‘20 15
KD 696 Summary of the most relevant wind tunnel measurements presented in
report R 408 S from 1979, performed on a scale model of the CWD 2740 rotor,
February 2020. 8
KD 697 Determination of the starting torque coefficient Cq start for
constant chord and tapered blades, February 2020. 6
KD 698 The Gö 227 airfoil for use in windmill rotor blades, February 2020. 8
KD 699 Calculations executed for the 3-bladed rotor of the VIRYA-4.4
windmill (d = 5.25, stainless steel blades) using a 34-pole PM-generator
for coupling to a centrifugal pump with a 1.1 kW asynchronous motor,
February 2020. 16
KD 702 Ideas about the 8-bladed rotor of the VIRYA-0.54 windmill (d =
1.25, pentagonal aluminium blades) coupled to a Nexus hub dynamo for 12 V
battery charging, August 2020. 11
KD 703 Ideas about a 4-buckets Savonious rotor called the VIRYA-1.45 for
driving a positive displacement pump, August 2020. 5
KD 704 Ideas about a piston pump with a floating valve for the VIRYA-3.6L2
windmill for irrigation of farmland from a river or a lake, August 2020. 13
KD 705 Ideas about the use of the 3-bladed VIRYA-3B3 rotor (d = 6.5) in
combination with the axial flux generator of Hefei Top Grand type
TGET320-1KW-350R for 48 V battery charging, August 2020. 12
KD 707 Replacement of the original radial flux PM-generator of the
VIRYA-4.2 by the axial flux PM-generator of Hefei Top Grand type
TGET380-10kW-1200R for 48 V battery charging, September 2020, reviewed May
2021. 15
KD 708 Ideas about a 22-pole permanent magnet generator for the VIRYA-2.7
windmill using a 4-pole, 3-phase, 1.5 kW asynchronous motor frame size 90
and 27 ½ neodymium magnets size 40 * 10 * 4 mm, October 2020, reviewed May
2021.10
KD 709 Opwekking van warmte met een windmolen in het buitengebied (in
Dutch), januari 2012, herzien maart 2021. 16
KD 710 Calculations executed for the 3-bladed rotor of the VIRYA-5B3
windmill (d = 6) meant for connection to the axial flux generator of Hefei
Top Grand type TGET450-5KW-300R for grid connection, January 2021. 18
KD 713 Opslag van duurzaam opgewekte warmte in een waterbuffer voor vier
door garages geschakelde vrijstaande huizen, maart 2021, herzien april
2021. 18
KD 717 Calculations executed for the 3-bladed rotor of the VIRYA-2.7
windmill (d = 6, wooden blades) using the axial flux PM-generator of Hefei
Top Grand model number TGET260-0.5KW-350R. May 2021. 17
KD 718 Ideas about a 16-pole, 3-phase permanent magnet generator using the
housing and winding of a 4-pole asynchronous motor frame size 100, May
2021. 11
Note: Development procedure of a range of wind turbines 1
Note: 10-pole PM-generator 2
Note: Modification of the winding of the PM-generator type FP-640 5
Manual of electricity generating windmill VIRYA-1.04 (contains complete set
of drawings), March 2014. 13
Manual of electricity generating windmill VIRYA-1.36 (contains complete set
of drawings), November 2014 15
Provisional manual of electricity generating windmill VIRYA-1.66 (contains
drawings of rotor and generator), January 2016 11
Provisional manual of electricity generating windmill VIRYA-1.81 (contains
drawings of rotor and generator), April 2017 12
Manual of a 27.6 V, 200 W battery charge controller, March 2006, modified
December 2016 11
Designs are largely low wattage and targeted at small developing country
use for water-pumping or electricity generation.
https://kdwindturbines.nl/?fbclid=IwAR02Yl_eoXqUe4HyMgm95MLXpktVcNO_ESoWa4U1XjCBa6swjVC2jRx4eqA
*Index*
https://kdwindturbines.nl/wp-content/uploads/2021/05/List-public-KD-reports.pdf
*Reports - all links*
https://kdwindturbines.nl/kd-reports/
*Bio / overview*
https://kdwindturbines.nl/wp-content/uploads/2019/08/KD-folder-August-2019.pdf
*Sequence of reports for self study*
https://kdwindturbines.nl/wp-content/uploads/2021/05/Sequence-of-KD-reports-for-self-study.pdf
_______________
Contact
Engineering Office Kragten Designing. Adriaan Kragten
Populierenlaan 51
5492 SG Sint-Oedenrode
The Netherlands
Telephone: + 31 (0)413 475770
E-mail: ***@kdwindturbines.nl
__________________________
*Memoirs of a motorcycle mechanic :-)*
https://kdwindturbines.nl/wp-content/uploads/2015/01/Memoirs-of-a-motorbike-mechanic.pdf
===================================
Overview of free public KD-reports of engineering office Kragten Design
(KD) 24 May 2021
All reports are in English except KD 35 which is available in English and
in Dutch and KD 709 and KD 713 which are in Dutch. The author of all
reports is ing. (B.Sc.) Adriaan Kragten. e-mail: ***@kdwindturbines.nl
website: www.kdwindturbines.nl.
Report title, year number number of pages
KD 35 Rotor design and matching for horizontal axis wind turbines, January
1999, reviewed February 2017. 62
KD 35 Nederlands Rotorontwerp en matching voor horizontale as windturbines,
februari 2017. 62
KD 78 Measurements performed on a generator with housing 5RN90L04V and a
4-pole armature equipped with neodymium magnets, March 2001, reviewed March
2015. 25
KD 82 Measurements performed on a generator with housing 5RN132M04V with a
standard 400/690 V winding provided with a 4-pole armature with neodymium
magnets, June 2001. 18
KD 97 Determination of Cq for low values of . Deriving the Cp- and Cq-
curves of the VIRYA-1.8D rotor, July 2002, reviewed January 2020. 10
KD 196 Questions and answers on a wind energy course based on report KD 35,
“Rotor design and matching for horizontal axis wind turbines”, In English
and in Dutch (Nederlands), May 2004. 12
KD 200 Measurements performed on a generator with housing 5RN112M04V and a
4-pole armature equipped with neodymium magnets, June 2004, reviewed
September 2016. 17
KD 213 Method to check the estimated -V curve of the hinged side vane
safety system and checking of the -V curve of the VIRYA-4.2 windmill,
December 2004. 28
KD 215 The Darrieus rotor, a vertical axis wind turbine (VAWT) with only a
few advantages and many disadvantages, December 2004 5
KD 223 Method to check the estimated -V curve of the hinged side vane
safety system and checking of the -V curve of the VIRYA-3.3D windmill
(7.14 % cambered steel blades), February 2005. 28
KD 235 Use of the VIRYA-3.8 windmill for water pumping with a pump equipped
with a permanent magnet DC motor, July 2005. 10
KD 285 The Gö 711 airfoil for use in windmill rotor blades, June 2006,
reviewed February 2010. 6
KD 294 Coupling of a windmill to a single acting piston pump by means of a
crank mechanism, September 2006. 13
KD 319 Calculations executed for the 4-bladed rotor of the VIRYA-2.8B4
windmill (d = 2.5, galvanised steel blades), February 2007, reviewed
January 2020. 15
KD 320 Development of the VIRYA-2.8B4, a windmill with a Polycord
transmission in between the rotor shaft and the vertical shaft to drive a
rope pump or an Archimedian screw pump, February 2007. 21
KD 321 Combination of the VIRYA-2.8B4 windmill with a rope pump, February
2007. 13
KD 333 The Gö 711 airfoil modified as the Gö 711-12% and the Gö 711-10%
airfoil for use in windmill rotor blades (contains also characteristics of
the Gö 795, 796 and 797 airfoils), May 2007, reviewed May 2016. 11
KD 340 Rectification of 3-phase VIRYA windmill generators, May 2007,
reviewed April 2017. 15
KD 341 Development of the permanent magnet (PM) generators of the VIRYA
windmills, May 2007, reviewed May 2021. 25
KD 364 Derivation of the formulas for torque and volumetric efficiency for
a single acting piston pump with a floating valve, November 2007, modified
May 2008. 9
KD 377 Development of a tornado proof pendulum safety system for a medium
size wind turbine which turns the rotor out of the wind along an horizontal
axis, April 2008, reviewed November 2019. 17
KD 378 Basic knowledge about electrical, chemical, mechanical, potential
and kinetic energy to understand literature about the generation of energy
by small windmills, May 2008. 15
KD 398 The 7.14 %, 10 % and 12.5 % cambered plate as airfoil for windmill
rotor blades. Aerodynamic characteristics, geometry, moment of inertia I
and moment of resistance W. November 2008. 13
KD 409 Development of an ecliptic safety system with a torsion spring,
February 2009, reviewed May 2016. 22
KD 416 Windmills using aerodynamic drag as propelling force; a hopeless
concept, April 2009, reviewed September 2019. 11
KD 417 The rotating blade, vertical axis wind turbine, April 2009, reviewed
November 2015, 10
KD 431 Description of the inclined hinge main vane safety system and
determination of the moment equations, December 2009. 19
KD 437 Ideas about a pitch control system for the VIRYA-15 windmill (d =
8, Gö 711 airfoil), February 2010. 23
KD 439 Development of a pendulum safety system with a torsion spring and e
= 0.2 R, March 2010, reviewed April 2021. 17
KD 463 The Gö 622, Gö 623, Gö 624 and Gö 625 airfoils with thickness/chord
ratios of respectively 8 %, 12 %, 16 % and 20 % for use in windmill rotor
blades, August 2011, reviewed January 2020. 13
KD 465 Calculations executed for the 2-bladed rotor of the VIRYA-1.5
windmill (d = 4.5, steel blades) with generator frame size 71 and original
motor shaft, August 2011, reviewed October 2018. 16
KD 484 Calculations executed for the 3-bladed rotor of the VIRYA-3B3
windmill (d = 6.5, wooden blades), February 2012, reviewed November 2018.
20
KD 485 Safety systems for small wind turbines which turn the rotor out of
the wind at high wind speeds, February 2012, reviewed May 2016. 24
KD 490 Water pumping with a windmill, March 2012, reviewed August 2020. 10
KD 491 Research to the usability of the Solaflux pump with a 2.6 mm cam in
combination with the VIRYA-3B3 windmill, March 2012, reviewed October 2018.
11
KD 501 Determination of the Cm- curves for different positions of the axis
of rotation for a 10 %, 5 % and 7.14 % cambered airfoil with an aspect
ratio of 5, July 2012, reviewed April 2018. 10
KD 503 Development of an alternative permanent magnet generator for the
VIRYA-3 windmill using an Indian 4-pole, 3-phase, 2.2 kW asynchronous motor
frame size 100 8
and 8 neodymium magnets size 50 * 25 * 10 mm, September 2012, reviewed
December 2019.
KD 518 Calculations executed for the 3-bladed rotor of the VIRYA-1.04
windmill (d = 3.5, 7.14 % cambered, aluminium blades) meant to be coupled
to a Nexus hub dynamo (with free manual), Jan. 2013, reviewed May 2013. 16
KD 522 Ideas about a 4-pole, 3-phase axial flux permanent magnet generator
for the VIRYA-1.5 windmill using square neodymium magnets size 30 * 30 * 15
mm and no iron in the stator, June 2013. 11
KD 531 Ideas about a 16-pole, 3-phase axial flux permanent magnet generator
for the VIRYA-3B2 windmill using 16 neodymium magnets size 50 * 15 * 15 mm,
Sept. 2013 12
KD 532 Calculations executed for the rotor of the VIRYA-3.1 windmill (d =
7, Gö 623 airfoil), with 2-bladed rotor made of Roofmate and glass fibre,
September 2012, reviewed February 2020. 18
KD 539 Ideas about a fast running vane pump directly driven by a 0.37 kW,
4-pole asynchronous motor frame size 71, December 2013, reviewed September
2018. 15
KD 542 Ideas about a diaphragm pump with three in line diaphragms driven by
a 0.37 kW asynchronous 4-pole motor or a permanent magnet DC motor frame
size 71 and a of manufacture Rossi, January 2014. 14
KD 544 Ideas about a double piston pump with a constant upwards piston
speed driven by an asynchronous 4-pole, 3-phase motor or a permanent magnet
DC motor frame size 71 reducing gear box frame size 32 15
of manufacture Rossi, January 2014, reviewed May 2016.
KD 551 Aerodynamic characteristics of rectangular flat plates with aspect
ratios 5 : 1, 2 : 1, 1 : 1, 1 : 2 and 1 : 5 for use as windmill vane
blades, March 2014, reviewed September 2020. 21
KD 560 Ideas about a direct drive 34-pole permanent magnet generator for
the VIRYA-3.3S windmill using the stator stamping of an Indian 6-pole,
3-phase, 2.2 kW asynchronous motor frame size 112 9
and 51 neodymium magnets size 40 * 10 * 5 mm, May 2014, reviewed December
2017.
KD 562 Development of a tubular tower for the VIRYA-3.3S windmill, June
2014, reviewed December 2014, 8
KD 571 Development of an 8-pole, 3-phase axial flux permanent magnet
generator for the VIRYA-1.36 windmill using 8 neodymium magnets size 25.4 *
25.4 * 12.7 mm. November 2014, modified April 2017. 20
KD 576 Calculations executed for the 3-bladed rotor of the VIRYA-3.3S
windmill (d = 4.5, steel blades) using a 34-pole PM-generator for coupling
to a pump motor, December 2014. 16
KD 578 Calculations executed for the 3-bladed rotor of the grid connected
VIRYA-6.5 windmill (d = 6, Gö 711 airfoil, wooden blades) provided with
the hinged side vane safety system, February 2015, reviewed January 2016. 12
KD 579 Extended calculations executed for the grid connected VIRYA-6.5
windmill, March 2015, reviewed March 2018. 24
KD 580 Ideas about a small 34-pole permanent magnet generator for a small
windmill or for human power, using the stator stamping of a 6-pole
asynchronous motor frame size 80 ------, March 2015, reviewed May 2021. 12
KD 582 Development of a tubular tower for the VIRYA-4.2 and the
VIRYA-4.6B2, March 2015, reviewed November 2016. 10
KD 595 Measurements performed on a Chinese axial flux generator of Hefei
Top Grand model TGET165-0.15kW-500R for a 12 V battery load, September
2015. 12
KD 596 Ideas about a 12-pole axial flux generator for the VIRYA-1.66
windmill using 12 neodymium magnets size 25.4 * 25.4 * 12.7 mm. Design
report of the rotor. October 2015, reviewed February 2016. 19
KD 598 Ideas about the 3-bladed VIRYA-0.65 water turbine with 20° inclined
shaft coupled to the generator of the VIRYA-2.68 windmill for 12 V and 24 V
battery charging. 19
Ideas about an alternative 2-bladed VIRYA-0.625, November 2015, reviewed
June 2018.
KD 599 Measurements of Savonius rotors available on the Internet, December
2009, reviewed August 2019. 7
KD 601 Ideas about a self starting, 3-bladed H-Darrieus rotor for water
pumping, December 2015, reviewed August 2019. 9
KD 614 Calculations executed for the 2-bladed rotor of the VIRYA-5 windmill
(d = 7, Gö 711 airfoil) meant for connection to a 34-pole PM-generator for
driving the 1.1 kW asynchronous motor of a centrifugal pump. 24
Description of the 34-pole generator. August 2016, reviewed November 2016.
KD 615 Calculations for the 3-bladed rotor of the VIRYA-0.98 windmill (d =
3, 15° folded aluminium blades) meant to be coupled to a Nexus hub dynamo,
September 2016 12
KD 616 Translation of parts of report R343D of June 1978 from Dutch into
English. R343D gives wind tunnel measurements for a rotor with tapered
blades-- November 2016 12
KD 617 Design report of the VIRYA-2.02 rotor (d = 6, B = 2, tapered
stainless steel blades), November 2016. 10
KD 622 Ideas about a pitch control mechanism for the 2-bladed rotor of the
VIRYA-5 windmill (d = 7, Gö 711 airfoil) meant for connection to a 34-pole
PM-generator for driving an asynchronous motor of 26
a centrifugal pump. Description of the 34-pole generator, December 2016.
KD 624 Ideas about a direct drive 46-pole PM-generator for the VIRYA-6.5
windmill meant for driving the 2.2 kW asynchronous motor of a centrifugal
pump, January 2017. 12
KD 631 Development of an 8-pole, 3-phase axial flux permanent magnet
generator for the VIRYA-1.81 windmill using 8 neodymium magnets size 45 *
15 mm and a stator made out of synthetic material. 17
Calculation of the rotor geometry, April 2017.
KD 632 Ideas about a 26-pole permanent magnet generator for the VIRYA-2.2
windmill using the housing of a 4-pole, 3-phase, 0.75 kW asynchronous motor
frame size 80 17
and 26 neodymium magnets size 40 * 7 * 3 mm. Design report of the rotor (d
= 4.75, B = 2, galvanised steel blades), May 2017, reviewed May 2021.
KD 644 Ideas about an 8-pole, 3-phase permanent magnet generator with a
stator without iron in the coils, using eight neodymium magnets size 80 *
20 * 10 mm and a housing of an asynchronous motor with frame size 71, 9
November 2017, reviewed November 2018.
KD 645 Ideas about a 10-pole, 3-phase permanent magnet generator with a
stator without iron in the coils, using 20 neodymium magnets size 50 * 20 *
10 mm and a housing of an asynchronous motor with frame size 80, June 2019.
12
KD 648 Ideas about a 38-pole permanent magnet generator for the VIRYA-3B3
windmill using the housing of a 6-pole, 3-phase, 1.5 kW asynchronous motor
frame size 100 and 57 neodymium magnets size 40 * 7 * 3 mm, December 2017. 9
KD 651 Calculations executed for the 4-bladed rotor of the VIRYA-3.6L2
windmill (d = 2, galvanised steel blades) with a Polycord transmission in
between the rotor shaft and the vertical shaft 23
to drive a rotating positive displacement pump, March 2018, reviewed
October 2018.
KD 654 Calculations executed for the 3-bladed rotor of the VIRYA-3.6PC
windmill (d = 4.5, galvanised steel blades) driving the VIRYA-4.2
PM-generator for 26 V star or driving a centrifugal pump 20
through a rectangular gear box and a vertical shaft in the tower.
Description of the pitch control safety system, April 2018.
KD 656 Calculations executed for the 2-bladed rotor of the VIRYA-2.92 (d =
6, stainless steel tapered blades) driving the VIRYA-2.68 PM-generator for
24 V battery charging, June 2018. 18
KD 658 Calculations executed for an alternative rotor of the VIRYA-4.2
windmill (d = 6.5, Gö 711 airfoil) used for 24 V battery charging, June
2018. 17
KD 661 Ideas about a vane pump for low height irrigation directly driven by
a 24 V, 0.35 kW, permanent magnet DC motor frame size 71, October 2018. 17
KD 662 The VIRYA-0.45, a small wind turbine for practical tests by students
in the class room, October 2018. 9
KD 664 Calculations executed for the 2-bladed rotor of the VIRYA-1.8W
windmill (d = 6.25, wooden blades) used in combination with an 8-pole
permanent magnet generator frame size 71 with a stator with no iron in the
coils, Nov. 2018 12
KD 667 Ideas about a 12-pole permanent magnet generator using a motor
housing frame size 100 and a stator with no iron in the coils for use in
combination with the VIRYA-3B3 rotor, November 2018 12
KD 668 Ideas about a 24-pole permanent magnet generator with a stator with
no iron in the coils for the alternative VIRYA-4.2 rotor for battery
charging or for combination to the1.1 kW, 3-phase asynchronous motor of a
centrifugal pump, 14
December 2018, reviewed January 2019.
KD 669 Calculations executed for the 2-bladed rotor of the VIRYA-1.75W
windmill (d = 7, wooden blades) with a Chinese axial flux generator of
Hefei Top Grand model TGET165-0.15KW-500R used for 12 V, December 2018. 12
KD 670 Calculations executed for the 3-bladed rotor of the VIRYA-5.2
windmill (d = 6, Gö 711 airfoil, wooden blades) provided with the hinged
side vane safety system, February 2019, reviewed October 2019. 18
KD 671 Translation of parts of report R-668-A “Optimalisering van een
windservo” (Optimization of a wind servo) from Dutch into English. Ideas
about the VIRYA-2B8, February 2019. 12
KD 672 Use of the VIRYA-1, the VIRYA-1.02 or the VIRYA-1.04 for pumping of
drinking water using a 12 V battery and a pump with a 12 V, DC motor. May
2019, reviewed August 2019. 8
KD 678 Calculations executed for the 3-bladed rotor of the VIRYA-1.02
windmill (d = 3.5, 15° folded stainless steel blades) meant to be coupled
to the VIRYA-1 generator, June 2019, reviewed December 2019. 19
KD 679 Development of an 8-pole, 3-phase axial flux permanent magnet
generator for the VIRYA-1 windmill using a bicycle hub and 8 neodymium
magnets size 25 * 12 mm -----, September 2019, reviewed December 2019. 22
KD 681 Ideas about an 8-pole, 3-phase permanent magnet generator using the
housing of an asynchronous motor frame size 80 and four neodymium magnets
size 80 * 20 * 10 mm with a magnet orientation 9
such that the fluctuation of the sticking torque is minimal, October 2019.
KD 683 Ideas about a 4-pole, 3-phase permanent magnet generator using the
housing of an asynchronous motor frame size 80 and four neodymium magnets
size 80 * 20 * 10 mm with a magnet orientation 11
such that the fluctuation of the sticking torque is minimal, October 2019,
reviewed December 2019.
KD 684 Derivation of the formula for the cone angle for a constant chord
blade which is connected to the hub by a hinge, October 2019. 6
KD 690 Ideas about a 4-pole permanent magnet generator for the VIRYA-2S
windmill using the housing of a 4-pole, 3-phase, 0.75 kW asynchronous motor
frame size 80 and 4 neodymium magnets size 80 * 20 * 10 mm. 15
Design report of the rotor (d = 4.5, B = 3, stainless steel blades),
December 2019.
KD 693 Calculations executed for the 4-bladed rotor of the VIRYA-3.5
windmill (d = 4, ss blades) meant to drive a centrifugal pump through a
Polycord transmission with an accelerating gear ratio 2.5 : 1 and a
vertical shaft in the tower,Jan ‘20 15
KD 696 Summary of the most relevant wind tunnel measurements presented in
report R 408 S from 1979, performed on a scale model of the CWD 2740 rotor,
February 2020. 8
KD 697 Determination of the starting torque coefficient Cq start for
constant chord and tapered blades, February 2020. 6
KD 698 The Gö 227 airfoil for use in windmill rotor blades, February 2020. 8
KD 699 Calculations executed for the 3-bladed rotor of the VIRYA-4.4
windmill (d = 5.25, stainless steel blades) using a 34-pole PM-generator
for coupling to a centrifugal pump with a 1.1 kW asynchronous motor,
February 2020. 16
KD 702 Ideas about the 8-bladed rotor of the VIRYA-0.54 windmill (d =
1.25, pentagonal aluminium blades) coupled to a Nexus hub dynamo for 12 V
battery charging, August 2020. 11
KD 703 Ideas about a 4-buckets Savonious rotor called the VIRYA-1.45 for
driving a positive displacement pump, August 2020. 5
KD 704 Ideas about a piston pump with a floating valve for the VIRYA-3.6L2
windmill for irrigation of farmland from a river or a lake, August 2020. 13
KD 705 Ideas about the use of the 3-bladed VIRYA-3B3 rotor (d = 6.5) in
combination with the axial flux generator of Hefei Top Grand type
TGET320-1KW-350R for 48 V battery charging, August 2020. 12
KD 707 Replacement of the original radial flux PM-generator of the
VIRYA-4.2 by the axial flux PM-generator of Hefei Top Grand type
TGET380-10kW-1200R for 48 V battery charging, September 2020, reviewed May
2021. 15
KD 708 Ideas about a 22-pole permanent magnet generator for the VIRYA-2.7
windmill using a 4-pole, 3-phase, 1.5 kW asynchronous motor frame size 90
and 27 ½ neodymium magnets size 40 * 10 * 4 mm, October 2020, reviewed May
2021.10
KD 709 Opwekking van warmte met een windmolen in het buitengebied (in
Dutch), januari 2012, herzien maart 2021. 16
KD 710 Calculations executed for the 3-bladed rotor of the VIRYA-5B3
windmill (d = 6) meant for connection to the axial flux generator of Hefei
Top Grand type TGET450-5KW-300R for grid connection, January 2021. 18
KD 713 Opslag van duurzaam opgewekte warmte in een waterbuffer voor vier
door garages geschakelde vrijstaande huizen, maart 2021, herzien april
2021. 18
KD 717 Calculations executed for the 3-bladed rotor of the VIRYA-2.7
windmill (d = 6, wooden blades) using the axial flux PM-generator of Hefei
Top Grand model number TGET260-0.5KW-350R. May 2021. 17
KD 718 Ideas about a 16-pole, 3-phase permanent magnet generator using the
housing and winding of a 4-pole asynchronous motor frame size 100, May
2021. 11
Note: Development procedure of a range of wind turbines 1
Note: 10-pole PM-generator 2
Note: Modification of the winding of the PM-generator type FP-640 5
Manual of electricity generating windmill VIRYA-1.04 (contains complete set
of drawings), March 2014. 13
Manual of electricity generating windmill VIRYA-1.36 (contains complete set
of drawings), November 2014 15
Provisional manual of electricity generating windmill VIRYA-1.66 (contains
drawings of rotor and generator), January 2016 11
Provisional manual of electricity generating windmill VIRYA-1.81 (contains
drawings of rotor and generator), April 2017 12
Manual of a 27.6 V, 200 W battery charge controller, March 2006, modified
December 2016 11
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