Got the engine complete, and it is coming out at 148lb. It includes
 starter, alternator, redrive, carburetor, exhaust muffler and all
pulleys.

 My design goal was a FF weight of 170lb, it will be very close, with the
 cooling system still to be added.

 Richard Sohn
 N2071U

 Excellent Richard. A 100 HP O-200 Chinese/Continental  aircraft engine
weighs
200 pounds.

 BTW is that a new front cover casting?
 Perhaps it will work on a 2 rotor.

 Paul Lamar

Richard.

Great.  I wish I could find a lighter starter for you.  Is the starting
torque
significantly less than a two rotor?

Doug in Japan

How about the starter from this?

Paul Lamar


Doug,

the required maximum torque is the same as on a two rotor 12A, however, the
total power is less because of only one compression stroke per e-shaft
revolution. The starter issue is the cranking speed. The rotary likes a
little more to reliably start under all conditions. I have also been using a
starter from a Suzuki, but the weight difference is negligible.

The front cover casting is totally different from the MAZDA original. The
big difference is the cooling cavity is not as deep as the two rotor
version, however, it may still be sufficient for a two rotor if it is run at
moderate power. Say under 250hp. Another difference is the oil system, which
has considerably smaller cross sections in the galleries.
Since I am using the stationary gear on this end, everything else is pretty
much the same as the original.

Richard Sohn
N2071U