Hi, 25 years ago I built a Cassutt M111 and just love that plane.  All
 the kids are gone now and I am thinking about building another one, but
 I would like to investigate using the 13B single rotor.  Has that been
 done before in the Cassutt?



 Cheers,



 Dennis Nagle, M.Ed., P.C.C.


 Not that I know of.

 Paul Lamar


We have a guy here with a Cassutt project for sale.

Chris Cosman
Utah

A Cassutt is a very small airframe.  It's designed around the C-series
Continentals - a 200lb engine, ready to run, depending on accessories.
Similar in size and weight to the Midget Mustang, though the
construction methods are totally different. This is probably the thing
the Cassutt has going for it with a Mazda rotary install - the tube
fuselage would be relatively easy to analyze for required beef-up.

The big challenge I see is that the empty weight and gross weight
would increase substantially when going from an O-200 (or C85) to a
13B.  Maybe 100lb heavier just for the engine installation.  In order
to have a reasonably large useful load, the MTOW (gross weight) would
have to be similarly increased.  This would drive the stall speed
(minimum flying) up.  Considering that it already has a relatively
high stall speed for a light single engine airplane, an increase would
make the stall speed, and landing speed quite sporty.

Increasing the landing speed makes the off-field (crash) survivability worse.

Finally, the fuel capacity of the Cassutt is 15 gallons.  With a 13B,
that would be about an hour and a half at cruise power.  That's not
very much time aloft in my book.

Don't get me wrong, I don't have a problem with a 13B powered
Cassutt..  I just think it's worthwhile to consider what you'd end up
with.  As well, as I alluded to above, the Cassutt design is one which
should be relatively easy for a structural engineer to redesign to
allow for the higher weight, horsepower, and fuel burn of the 13B as
compared to the small Continental.



Matt-

I think he was thinking single rotor Matt.

Paul Lamar