"Michael D. Lilja" wrote:

          Hi all,

          As I am new to the rotary world I have a few basic questions about
          rotaries. I understand the basic operating priciples of a rotary
          engine, but I would like to know more about their operating
          characteristics. What is the torque output of a rotary like?

     Why do you want to know? It don't got no stinking torque :-)
     What do you need torque for?

     HP = torque x RPM /5252

     Therefore torque = (HP x 5252)/RPM

     Lets say the engine HP is 200 at 6000 RPM.
     The engine torque is then 175 foot pounds at 6000 RPM.
     The prop torque is 2.85 x 175 or 498.75 foot pounds.
     Exercise for the reader. What is the prop HP?

200 minus minor losses in the PSRU. If you want torque, how about 5252 ft-lbs at 1 RPM. That should make any plane jump off the runway...

          The
          recipricating engine still seems to be the most fuel efficient, what is
          the reason for the rotaries relative inefficiency?

snip

          Yes of course. They are real Percheron draft horse's. See picture below.

Main Entry: Per·che·ron
Pronunciation: 'p&r-ch&-"rän, -sh&-
Function: noun
Etymology: French
Date: 1875
: any of a breed of powerful rugged draft horses that originated in the Perche region of France

That is one I never heard before Paul, had to look it up.

Hans

 
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