Hi Paul
I have built an Australian designed stol a/c called a hornet that
normally uses engines 100 to 120hp  I am looking for an engine of about
120/150 hp what rotary would you recommend and what would its weight and
fuel burn be, I would only need about 80hp for cruise, the extra hp for
t/o and climb.

Paul MacRae

You could do that with a p-port one rotor. Power would be around
120 to 140 HP. Fuel burn would be .47 pounds per HP per hour.
Richard Sohn has the closest to production light weight
Mazda based one rotor.

Richard Sohn <res12@fairpoint.net

RES12
Power 110hp/7500RPM
Weight (w/o cooling rads) dry 170lb
Incl. Alternator, Redrive, Starter
Rotax type prop flansh
Redrive Hirth G 40
Ratios 2.03, 2.25, 2.64, 2.96, 3.33

RES13
Power 140hp/7500RPM
Weight (w/o cooling rads) dry 195lb
Incl. Alternator, Redrive, Starter
Redrives Hirth G 40
Ratios 2.03, 2.25, 2.64, 2.96, 3.33
RWS RD-1B (1:2.176)
RWS RD-1C (1:2.85)


Paul Lamar

Pardon me for butting in but you raised my curiosity in your descriptions of
the RES engines. What does the multiple ratios indicate? Are these
descriptions of various choices before ordering or does this indicate some
type of variable transmission?
Thanks.
Bill Hobson

You need to address that question to Richard.

Richard Sohn <res12@fairpoint.net

Normally these would be optional ratios for the gear box.
The higher the ratio the faster the engine can run with a given size
prop. The faster the rotary runs the more take off HP up to about
9,000 RPM.


Paul Lamar