Harry Sheldon wrote:

Hello again Mark,

snips

This is why I was looking at a captive design. I have no numbers to back

up

this choice, but like the compactness. This PSRU would only be

transmitting

about 40HP at takeoff, and will be tested extensively before I risk my

arse

behind it

I think that the main considerations here are:-
1)  Torque is the issue rather than hp; no worries as the M/C rear wheel torque
(rev & drop clutch) are far higher than will be encountered here
2)  Ballancing of the "hub" may be more critical as it will be going 6K+ rpm as
opposed to <200rpm ?  in a M/C wheel

Have you considered using a cogbelt reduction drive as you are only running low hp
?
One advantage is that the cog belt should also act as a 'cush-drive'
You'd probably save a shirt-load of lbs too. :-)

snips...

I reckon that poor ol' Tracy is flat out like a lizzard drinkin' with all he's got
on his plate already.
I'm full of admiration for what I've seen of his products esp. the redrive.
Thanks for your response Mark.
Regards
Harry S

 
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