-pondering recent posts about PSRU types i wondered if there has
     ever been
     built a belt drive such that a small gear belt drives a larger gear
     and then
     from that secondary shaft a smaller gear again belt drives a larger
     gear
     located in-line with the very first one, thus keeping the prop in
     line with
     the driving shaft.  this would eliminate the offset prop problem on many
     aircraft.  the step-down gearing could take place in two steps,
     rather than
     one like the typical belt drive.  the last gear would have to spin
     on the
     first gear's shaft, but everything rotates the same direction, so the
     surface speed isn't increased as much as the overall reduction
     ratio.  the
     belts would absorb power pulses well.  no lubricant would be
     needed.(right?)
     i would think it would be straight forward to build.  perhaps the
     diameter
     of the belt gears would need to be too big in order to have enough
     teeth or
     area in constant contact?  i'm sure this idea isn't new (probably first
     tried in 1908 or something!)   kevin

     Try 2006 :)
     --
     Paul Lamar ...No rotor no motor.




That Eggenfellner belt drive did not work out. He abandoned it, and now
uses all the housings as pallet stands.

Ken Bauman

Why did it not work out?

Paul Lamar

Hard to be sure as Jan is very secretive. I heard it lost a belt and
that belt took out the other belts. I also heard that Jan left a
wrench on the engine and that started the chain reaction.  The triple
redundancy was not redundant. Some concerns I heard were that 3 belts
don't share the load evenly, no means for tension adjustment, large
overhund load on the shafts. Officially I don't know. Must have been
severe as thats a lot of expensive components being used as stands.

Ken Bauman



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