vawt

[belgium2]

i have made a vawt like ropatec from 1.5m long and 1 m high.

with 20km/h wind it turns about 60 tr/min but has no power.

i have a video clip from it.can some one post this for me?

And can some one tell me what i doing wrong?

many thanks

[thunderhead]

By Bernoulli's Theorem, 1.5 square metres of air flowing at 20km/h can do a maximum amount of work of 342w (speed cubed times density times area).  But a VAWT is unlikely to recover more than 15% of that, so you might get 50w if you are lucky.

How much are you getting?

[XRay]

Hi belgium2,

Not so long ago, i found out i was building a Ropatec windmill:









Totally by accident  it turned out to be a Ropatec windmill. It starts to turn in low wind, 1 or 2m/s it's just 75x55x50cm. Also added an vcr motor to load it. Time is my biggest problem, progress is slow.

Visit my (Dutch) webpage it's all about my struggle to get off grid.

Keep us posted on this board.

Greeting,

XRay