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

I've been helping my cousin on his heavily modified Cassutt.  He's hung a Lyc.
320 on the front and lengthened the fuselage about 20 inches (at my persistent
urging), among other mods. So a two rotor can be made to work.

Single rotor would work great.  Two weeks ago I swapped my non running 3 rotor
for a running one rotor P port, although, it's a pretty small port (1.625").
All up weight, including RWS redrive was 215 lbs, less radiators and coolant.
Not exactly an o-200 equivalent when all is said and done, but neither is it's
power.

Westerman dynoed the motor at 112 hp at 6500 rpm, and that is with the low
compression rotor for a future turbo.  So with a bit of mild boost it will get
130 hp easily and be better than the O-235 for less installed weight.  This will
go well on version 2 of our LSA design.

Chris Cosman