Ken Welter wrote:

This engine package is going to be on my new four place coot but last
summer I installed it on my two place and did 11 hrs   of fight
testing on it. The rotary had a dog clutch on it and the rotax has a
sprag clutch. The rotax is 670 snowmobile engine that puts out 125hp
and 100 ft lbs of tork at 8500rpm it is used for extra take off and
climb out power and is shut down for cruise and a spare if you need
it and I have needed a spare before. In testing I found that it would
not hold ALT with just the rotax but would fly in ground affect at
about 20 or 30ft and at 10000ft I could get about 80 miles of glide
slope out of it. On land  I could take off with just the mazda and on
water I did not need the nitrous oxide but I still left it in its
nice to have that button if you need that extra boost in tight spot.
The extra engine also let me pitch the prop for high alt cruise but
have full power on climb out. After I do more testing on this I may
offer the rotax cog belt and drive assembly as an add on mazda prsu
that I make.

marc wiese wrote:

Wow. If Ken can engineer that, perhaps he can design a "twin pac" unit to
use 2 13Bs driving some type of clutch arrangement drive of a single prop?
Just think, a Heuy style 400hp rotary twin!
Kind of like those 2 guys from south america who flew a twin pack Izuz Cozy?
Marc Wiese

Even one step further, you could put a triple 13B arrangement in a
Lionheart, the engines positioned with the eccentric shaft axes parallel,
the engines oriented 120 deg. from each other measured from the center of
the cluster, and each driving a planet gear in a large planetary reduction.
Would probably still be lighter than the FWFW of the R985.

Chris
microcosman.com

Maybe but I doubt it. :-) The R-985 only weighs 653 pounds with
mags and starter. Three bare bones 13B's would be 600 pounds alone
not including the PSRU.

Hard to beat an aircooled radial engine on power to weight ratio.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org