> George,
 > I think you missed one point, my single rotor is based on 12A parts. I
 > extrapolated to 13B you are looking at around 150hp at 7500RPM.
 >
 > Richard Sohn
 > N2071U
 >

I guess I've also missed some of the info provided by Richard and Paul,
I'll go back and check.  While Richard's work on the single rotor was
interesting, I'd figured I would need a two rotor to provide enough
power for the Vision acft.  But, that plane is limited to 300 lbs FWF,
so it is right on the borderline for using a 13B (if we include the
PSRU, engine, mounts, cooling plumbing, etc).  Now, if we could get
150HP reliably from a single rotor, that might be just the ticket.

Last time I looked at it, the incremental weight savings from
eliminating one rotor didn't seem to be worth it for this application
(given the development work required and the potential for decreased
smoothness and reduced redundancy).  Maybe I need to keep an open mind
about the potential for using a single rotor 13B as Richard continues to
open these doors.

Mark Waldron

Mark,
This the type of engine installation you would be looking at for a single
engine. We are all working on getting on top of the negative torque pulses
associated with the single development - with the right damper.

If you make that 6.5 inch space between FF and engine and 4 inch prop
extension, that would be better - room for batteries. The 36 inch long cowl
is Steve's suggestion, smoother lines and smaller frontal area.

Larry  Childs will do the single crank and the bellhousing, these things
should be ready by the time your ready. Larry's BH is the next generation to
mine, it's lighter and looks nicer. I may even steal some of his ideas.
George (down under)