Can we move this topic away from Helicopters?
I really didn't know if it was appropriate to get involved in this as I'm brand new here, but when belts were mentioned it started to close in on my territory (I don't think belts would work, not if you want feedback from the motor).
If you looked at the HPA thread I mentioned, you'll see that I've tried to decrease friction by going away from gears to chain drive. Turns out that it didn't just reduce friction, it eliminated it. There's only one ball bearing in the unit, a $3.50 thrust bearing from Lee Campbell; all the rest are bushings, because that's all it needs. The bushings have been nylon, brass, and Tefzel (like Teflon). They all seem to work well with a drop of an appropriate lube on them. I have no way to scientifically measure friction. All I can say is that an .075 x 18" loop, when unwound, has only 20-30 winds remaining in it before one or two turns of the crank take out the rest.
The counter is electronic, and has the capability of counting down with a throw of a switch. It has a brake, but no ratchet.
Four of them are going to USIC with Bill Carney and Alan Mktarian, and these will get assed around for everybody to play with. Two more will go to Europe with Rolf Swensson in May.
I got a lot of help with the engineering from Bill Carney, Joshua Finn and Orville Olm.
Art.
Received on Sat Feb 19 2011 - 08:18:47 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:46 CET