ok for a lack of better knowledge im going to use analogies from a airplane in motion as the air strikes from head on. ok im looking at the props and mostly im...
http://www.nrel.gov/learning/re_wind.html A blade acts much like an airplane wing. When the wind blows, a pocket of low-pressure air forms on the downwind side...
-snip- ... pocket of ... low-pressure ... turn. This ... ok lets assume this D is a wing, and that curve side (even tho the curve isnt right) is the lift side,...
Because it has been proven it is the deflection that drives it not Bernoulli forces. Hasnt changed the textbooks tho. I have a model I am building of a drag...
ok on a separate note what do you think of a wing made of foam board (kind used in insulating homes) glued together for thickness and shrink wrapped for added...
Don't forget that this wing is traveling and the angle of attack takes this into account. It's not just wind flat onto the wing, but wind forming lift on a...
I'm partial to 2x6's myself, as they are quick, easy, and cheap. Laminated ones are prettier, and perform better. I've never tried a foam based one. I wouldn't...
Steve do you have the calculator? If so what are the ballpark numbers for output for a swept area of 100 square feet in 30 mph wind? Kirk Steve Spence...
Depends on the airfoil. Model airplane builders use a lot of foam these days. Kirk artic_knight31337 <artic_knight31337@...> wrote: ok on a separate note...
I'm a little worried about the long-term durability - however with carbon-fiber composites, this may be a good option. Perhaps more expensive tho... Be well, ...
hi group what im wanting to do is build wind mills like the ones here. and also use the same generating devices from the wind mill unit to make a unit driven...
The reason for the twist (on more optimized props) is due to relative velocity. For a given shaft speed, the root of the blade is traveling more slowly than...
alternators don't go in series, but they can be paralleled. these are awesome for battery charging, but I'm not sure what you mean about charging a converter. ...
A weekend spin isnt like windmill duty though. Leading edge protection is mandatory I think for a windmill. Dont know how sub zero affects it either. Kirk ...
I was curious what % of Betz the program assumed for airfoil efficiency. A preliminary penciling from your url shows my drag windmill to be right up there. I...
Just a quick note on the carbon-fiber props. I was talking to Ivo Zdarsky of Ivo-prop a while back (I used to fly behind and in front of his composite props in...
If you get a good steady wind kind of doubt the momentum would matter much. Are you talking about stuff like the old Blue Board insulation? Many places people...
Thousands of dollars in wind equipment get sold everyday - 365 days per year on eBay, Mike. Yet one man has maintained a monopoly for a long time and even...
ok so if deflection is the commmon answer for main power, wind to prop then im to assume that those old fashioned 6 blade bent steel sheet props are the best...
A quick thought: Fiberglass mat composite covered foam should be both strong enough and durable enough IF a high strength "spool" is embedded in the center....
the strength is in the epoxy skin. The foam isnt structural. Kirk davewheeling <davewheeling@...> wrote: If you get a good steady wind kind of doubt the...
... Actually the strength is in the skin, you are correct, but the foam IS structural. Without it the skin will resonate and flex like crazy, the foam is a...
I have been using a different starting point for my latest propeller experiments. I use the side of a plastic drum, I get the drums free for the asking at a...
Hi Browne I recently did a test with a stator made up of three coils, positioned 120 deg apart, at a pcd of 125 mm, all three coils wound with 18 SWG wire, 2...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
