Morgans wrote:


"Bill Daniels" bildan@comcast-dot-net wrote

Suppose the prop shaft is to be just long enough for the gear belt
pulley and the neccessary bearings - say 10 inches. But the engine
flywheel pulley is to be 4 - 6 feet below the prop shaft. The idea is
to use a very large multi-blade carbon fiber prop turning 800 - 1000
RPM driven by a 4 cyl Soob turning at best power RPM. The idea is to
get best thrust in the 0 - 60 knot range. The airframe configuration
is a prop over tail boom pusher - an ultralight on steroids. (BTW,
I'm not looking for a long engine life under these conditions. I'll
treat the Soob as a throwaway power plant.)


Strange, but I am considering a system, very much like that. Flying
boat, with the engine in the fuselage, instead of on a pylon.


Curious...
Tell me why?
What is the advantage?
(not argumentative, please - just curious)

If I absolutely *had* to do that, I'd think two stages.

HTD belt on the first stage from the engine, and either HTD, or Vopar type
chain for the final. Come to think of it, probably have to be chain for the
final drive due to the length of the thing...

But I'm back to the original question - why?

Wouldn't that put the engine where you would want to put people?

Richard