A butterfly's wing-shaped
A seagull's wing-shaped
A dragonfly's wing-shaped
A maple tree's seed-shaped
Record a quantity of the generation of electricity in wind-tunnel experiment
First, I conduct observation of the flow of air around blade by a blade
model. And, I record the generation electric energy by tester. In this
case, I discount the Reynolds similarity.
Make a butterfly’s wing-shaped blade
Cut a P.P board (2mm thickness) to 35cm long × 15cm wide and half circle
in a clavifarm part. Put a pipe which inside diameter is 1cm into the back
of blade as “bone”.
Make a dragonfly’s wing-shaped blade
Cut a PP blade (2mm thickness) to 35cm long × 15cm wide, and make cuts
in the back and front. Make a mountain fold and a valley fold.
Set up the wind lens on the dragonfly’s wing-shaped blade
I set up a wind lens made by myself as converging wind equipment. I bought
a tub which is the biggest in being on sale for \2000. And I cut the bottom
of it by saw.
Disassemble a hub-dynamo
A hub-dynamo which has just bought is very hard, so I pour sewing-machine
oil into a bearing part. I disassemble it because I wonder what kind of
the mechanism it has.
Join a blade and a hub-dynamo
Hold a blade and a hub-dynamo with a bolt (5mm) and a spacer (2cm). A pitch
angle is decided by the length of a spacer.