vertical Windmill - stackable design -

I have designed this vertical windmill as a stackable design.
You can often mount the windmill one on top of another to drive an axle.
as an extension, a belt drive for a small generator will be available in the next few days. The should then provide a charging socket with USB port with power to charge my phone or batteries.

material list 2x stacked windmill:

M8 700 mm threaded rod
2x ball-bearing 608-ZZ - Ø 22 mm outer diameter, Ø 8 mm inner diameter, 7 mm height
3x washer, Ø 24 mm outer diameter, Ø 8,4 mm inner diameter
6x M8 mother - (3x for axle section - 3x to fix axle section to axle)
6x M3x15 mm screw - (Attach the arms to the lower axle section)
6x M3x20 mm screw - (Attach the arms to the upper axle section)
6x M3x30 mm screw - (Attaching the arms to the center piece axle section)
24x M3x30 mm screw - (Attach the arms to the wing)
18x M3 securing nut

Carefully melt the locknuts with a soldering tool into the axle mountings for perfect fit.

Youtube Videos:https://www.youtube.com/watch?v=1ZU7dzfs3kQ

https://www.youtube.com/watch?v=fAK3_qnhW1U