Wind Turbine Shaft Details

S H A F T A D A P T E R F O R W IN D T U R B IN E 1 / 2 " lo n g b y 3 / 8 " d ia

1 - 1 /8 lo n g b y 3 /4 " d ia

3 / 8 lo n g b y 1 /2 " d ia

5 /1 6 " h o le b o r e d 1 - 3 /8 " d e e p

2 e a . 1 /8 " g ru b s c re w s e x a c t ly 9 0 d e g r e e s a p a r t o n c ir c u m f e r e n c e .

The motor being used for the turbine is from a shredder. It is a 12 VDC PM motor, with a 5/16”dia. shaft with four teeth in a coarse worm-like arrangement. It looks sort-of like a rifle barrel turned inside-out. The shaft is actually square, but the one-turn-in-aboutthree-inches makes it really round. I’m going to mount the motor through a piece of sheet-steel, just like it was originally mounted. That will extend downward and then bend horizontally so it will mount to a flat surface. The original prototype will probably use just a 2X4 with some sheetaluminum for a rudder. I will use voltage-regulation instead of furling at high speeds. Excessive speeds will probably require some automatic dynamic braking in the future. This is just a concept device right now. I just need to get it into some wind to see how long the prop blades need to be. Eventually this will be a vertical turbine, so I don’t have to mess with sliprings, etc. I’ll use this to charge 12-volt batteries which will operate an inverter for 115 volts AC. We have tossed out several UPSs, and I saved the ones that still work as inverters.

PROPELLER HUB DETAIL

2 e a . 1 /8 " g ru b s c re w s a p p ro x . 9 0 d e g re e s a p a rt

1 2 e a . 1 /4 -2 0 ta p p e d h o le s fo r fo u r p r o p e lle r b la d e s ( o r 9 h o le s @ 1 2 0 d e g r e e s a p a rt fo r th re e b la d e s )

1 /2 " by s ix in c h d ia . p ro p hub

COMBINED SHAFT ADAPTER AND PROP HUB

C o m b in e d d ia g r a m o n e a n d t w o . T h is is a o n e - p ie c e d e s ig n o f th e s h a ft a d a p te r a n d p r o p h u b .

5 /1 6 " h o le b o r e d 1 3 /8 " d e e p

1 /2 " by s ix in c h d ia . p ro p hub