Wrathall Mark wrote:

Harry Sheldon wrote:

Hello  Mark

The rubber motorcycle torque damper:( ie Triumph rear hub) is an area I

have yet to research in detail so I'd be interested to know what you find.
The best I've found is the transmission torque damper from 60's 70's Fiats:
hexagonal rubber doughnut with steel Y either side driving / driven. Problem
maybe that if rubber fails I think drive will be lost (unlike captive rubber
in M/C hub).

REgards
Harry S

Hi Harry,

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 started drawing up the rough draft PRSU over the weekend, but need to
finalise the planetary set, as many dimensions are set by this. I recommend
anyone who would like Tracy to change something about his redrive, to sit
down and design your own in cross section. It takes about an hour. When you
are finished, answer these questions:
How do you assembly it?
How do you then diassemle for maintenance?
How is thrust on the Prop shaft dealt with?
How is thrust in the plantery set dealt with?
How are the bearings retained?
How are the bearings lubed?
How is the planery set lubed?
How do you drain each?
How do you allow the planets to float?
How to you retain the prop flange?
How do you retain the Bell gear?
Notice, we haven't ever started to calculate loads and lifes etc?

Once you have finished, leave Tracy to get on with production :)

Mark Wrathall

 
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