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One UJ
chunkielad - 1/3/05 at 08:01 PM

Looking at my middy BEC design and I realised I only have space for one UJ.

Is this going to be an issue?

ReMan - 1/3/05 at 09:13 PM

I may be wrong but I think that the physics of it dictates that you need a pair to keep the input and output velocity constant?

JoelP - 1/3/05 at 09:41 PM

reman would be technically right, but if the shafts were very nearly aligned the 'outness' would be minimal. Maybe use a rubber cush or donut instead?

chunkielad - 1/3/05 at 09:47 PM

I am only talking the length of one UJ for the whole shaft. The output on the bike engine matches the gear box end of the UJ!!

ReMan - 1/3/05 at 10:20 PM

quote:
Originally posted by JoelP
reman would be technically right, but if the shafts were very nearly aligned the 'outness' would be minimal. Maybe use a rubber cush or donut instead?


Hmm, I think that Joels idea of a rubber (infinitely flexible in 3D) may be the way to go, however small , my theory would cause either some speed variation (tiny though it would be) or a tendancy for the joint to move in and out , i think Now its hurting!