On May 22, 12:06*pm, Bob wrote:
Dear Canuck,

Please accept my sincere apology for my unfair assumption (and for
Harry's too) that everyone in the whole wide world is balanced on the
razor's edge of Aviation History.

No harm here gentlemen, I'm too old and all us Canadian lads are a
tough bunch, skin like a rhino.

Actually guys I am aware of the Wright brothers but surely what they
did has no relevance here! I believe it was Quad city UL's or at
least someone who still supplies chains as a PRSU for rotax (i]'ll
track down a link). Also Kitplanes had a great article of a guy using
a Japanese crotch rocket bike motor with a chain drive off the
original sprocket to drive a prop quite a bit above the engine. He
ran 10000 rpm and shifted his tranny for different flight regimes.

I was caught up in the discussion about doing a plane extremely
cheap. Chain drives and sprockets, pillow blocks, cheap shafts, and
everything needed to build a prsu are available and salvagable from
dead machines. A discussion of the merits of the different pulley and
belts is nonsense for a guy in Siberia, Central China and the
Himalayan foothills. Motorcycles and chain driven small farm machines
are EVERYWHERE on this planet in the third world.