>Would I experience the same with 6 blades and half rotor area, as with three blades >and the same rotor area? The blade area of the 6 blades should be the same as of 3 >blades, in that case???
Answer: NO
>Idea:
>If I put half size blades, let's say about 30 cm, it is allmost one quarter of an >125cm rotor area. If I give just some more length to get something more than 1/4 >area, and than put 6 blades, to catch more wind. Would it work?
Answer: NO, it would run but would not give you the power you think. Area = Pi X Radius^2 ; therefore the area for a 125 cm prop is 1.22 square meters, the area for a 30 cm prop is 0.07 square meters; 17.25 times smaller than a 125 cm area.
The answers are regarding your train of thought that if you add more blades to the same size prop you get more power. It doesnt work that way, in fact as you start adding a bunch of blades you start getting less power.
Out of a 60 CM (~2 ft ) prop you will get roughly the following.
- mph 5 watts
- mph 16 watts
- mph 38 watts
- mph 75 watts
- mph 130 Watts
as you can see your not going to get near your 75 to 100 W in low to moderate winds.
The way to calculate this has been posted maybe 10 times in the last month. Se a post by picmacmillian from a few days ago trying to explain this concept.
Good luck.
John