Fly- Guy,
I agree 2strokes are not like 4 strokes.. I own both 2 and four strokes.. What I was sayin' is the ST will NOT turn as high rpm's however both engines with 12x6's the ST WILL turn higher r's than the Th, BUT both engines with a speed type prop (10x6, 10x7) The TH will turn Higher revs.. So the ST is more LIKE a 4s because it's more of a torq type engine suited for a warbird or similar where The TH is more suited to a Q-500 racer..

BTW my trainer w/ ST51 and 11x6 goes something like 66.4 MPH(i think that was what the radar gun said[&:])... Wanna race?