Recent content by geebee

Moving on (a lot) I was looking today at ebikes. Electric bycycles. Basically a regular push bike with an electric motor in one of the hubs and a battery pack. I find these motors are designed to produce power and also collect power on braking. As much generators as they are motors. (I know...

I believe the large 3 blade turbines can and do kill birds. The blades may only turn at 40rpm but when the things are up to 80 metres across the speed at the tips is considerable. A bird will atempt to fly through the turbine, misjudge the speed and get clouted. Small wind turbines that wizz...

Isly, Yes simply increase the speed of the armatuer. Surely this is highly desirable. Generator spinning faster at low wind speeds. Hey I am only an amateur. but I think its fare to say that a generator is more efficient at higher rpm and a wind turbine more suited and more likely to generate...

I have trouble seeing the merrits of a ferris wheel type design in harnessing wind power. Any such design would surely be very dificult to keep pointed into the wind? Underwater in a a place where there may be a strong tide maybe this would work, but then the numerous moving parts and...

The ferris wheel idea is interesting, I have seen some designs like this. It might be worth starting a new thread on the ferris wheel concept but regarding this thread I think we should be discussing: 1) What advantages do multiprop designs have over single prop. a) This is pretty well...

The Selsam looks like a good design, It's not contra rotating, though I imagine left arm rotates in oposite direction to the right as on a 2 prop plane. I was thinking along lines of back of one arm rotating one way and front in the other a) You can do this with 2 poles + 2 generators with...

Quote: I was the original concept designer based on Woods Guide to Fan Engineering ! Do you have any decent facilities to build a small turbine?

For what its worth I would invisage a working contra rotating design would look something like (not exactly same as) these pictures I quickly found on the net. http://www.speakerfactory.net/pat5.jpg http://www.speakerfactory.net/wind_old.htm I haven't read about these turbines but I...

spongebob, This was some time ago you posted this but as I was also asking myself the exact same question when I found your post I thought I should reply with my thoughts. On the face of it this seemed a good idea. However for this to work you must consider the torque generated by the two...