by tvoivozhd - Sat Dec 06 (2003)
wind turbines, Hawts, Vawts, lSavonius rotors, low-mass sailwings
There are innumerable such devices listed in the U.S. and European patent sites.
A recent good one in the U.S. is the invention of Robert Green. It consists of four sailwings, with opposite pairs connected to each other by
a cord to assist in collapse and opening of the parachute wing. They can
be stacked like a Savonius for more torque.
The simple pipe-support is held vertical by four guy-wires. The original
model had the pipe-support rotating to transmit power to a ground-level water pump, air pump, etc. Damned dangerous.
The current model has the power transmitted by a rod inside of the support pipe.
Virtue of the thing is that it is dirt cheap, and being low-mass, will
produce power in very low wind velocity. Not as efficient as a
well-designed wind turbine, but the simplicity, low cost and ease of
erection or take-down offsets loss of efficiency for rural pocketbooks.
You really need a direct drive horizotal wind-turbine for electrical
generation, to avoid the energy loss in gearboxes. You might be able to
use a low-mass sailwing and a gear-multiplication of some kind with the
Green design, by stacking the sails for more torque. It is a drag-device,
so it will not rotate at speeds a good permanent magnet generator
requires--ergo, the necessity for a power-robbing gearbox.
by peter broekmeulen - Fri Oct 31 (2003)
robert green concept
The difference in winddrive and robert green concept is the way in which
the winddrive offers a gear connection because the windwheel is also the
big gearwheel and because the big wheel can be with a diameter of 2 mtr
and the generator wheel with 10 cm you have a 1:20 distribution. This is
probably enough for a standard car generator.
by Reinder / Demotech - Fri Oct 31 (2003)
Re: robert green concept
Peter, please give a link or info on the concept of Robert Green.
Regarding the drive-ratio between WindRotor and Generator pulley: a car
generator has a far too low efficiency and should not be used. The
WindDrive should use a generator that rotates at least at 5000 RPM, With a
meter diameter rotor (the diameter on which the sails rotate is
smaller!) such a high drive ratio is well possible.
by Hans Baarslag - Fri Oct 31 (2003)
Windmills are normally designed for a windspeed where they work most
efficient.One can choose for a lot of blades with low turning speed and
alow windspeed that starts them,or a few blades with high turning speed
and a higher starting windspeed.A further choice is direct coupling to the
grid with a higher efficiency or feeding into a battery.The first choice
means maintaining a steady turningspeed because of the frequency of the
grid.The second choice limits the quantity of electricity that can be
stored and special electricity users or a sophisticated convertor with its
inherent loss of overall efficiency.The first observation means one has to
know about windspeeds at the place the windmill is planned.Then choices
are to be made.
Slow windspeeds are more common but higher speeds deliver more.The
windspeed after the mill must be appr 70 % of the speed before the
windmill as far as I know.How can the winddrive vary in order to adapt at
the conditions?The number of sails can vary ofcourse Can they also be made
smaller?The diameter of the wheel on the generator can be adapted I
Is that a design matter or is it easily changed at a stop?
by Hans Baarslag - Fri Oct 31 (2003)
When a windmill is not stopped or turned from the wind in strong winds or
gales the electrical devices wil be overloaded and burn out.How do you
plan that for the winddrive?
by peter - Sun Dec 05 (2004)
hoi reinder er zijn nog veel meer links naar dit type molen dynamo
ik denk dat deze man de initiator is,
oorspronkelijk heeft hij voor de engelse ontwikkelingshulp een werkmap
wat vind jij van heyt ontwerp
by firstname.lastname@example.org - Mon Dec 06 (2004)
wind drive Name
by Hans Baarslag - Sun Dec 04 (2005)
naam voor winddrive
Als nederlandse naam stel ik voor: rondzeiler of zeilmolen of zeildrijfwerk.
In het engels saildrive, round sailer, enz. Hier zijn dus enige aanknopingspunten voor de zoekmachines. Hans
by Bert / bedenkerij.nl - Sun Dec 04 (2005)