Anything about weight comparisons Slowrotor? I've come to the conclusion that radials weigh about the same as rotaries for any given naturally aspirated power. Basically excess crank&block mass is removed.
I remember reading a paper by Mercedes that compared their own developed uniflow 2-stroke diesel to it's 4-stroke diesel baseline - they must have spent quite a bit of cash in development. Despite the myths, the 2-stroke actually faired no better in terms of power! The reason was you needed about 1.8 times the air to scavenge, and a sizeable proportion of stroke was given to scavenge. This seems to be born out by the Wilksch Airmotive and Deltahawk turbo-diesel engines, which while being good performers weigh about what i would expect a comparable 4-stroke turbo-diesel to weigh.
http://www.wilksch.com/ ;
http://www.deltahawkengines.com/
I suspect rotary engines are the same. The truth behind the myth is that they have slightly higher RPM capability, but the power-to-weight does not reach legendary performance.
Mart