ORIGINAL: summerwind
ORIGINAL: Konrad
Thanks! That for sure is not the standard Cox radial porting. Is that the correct term? I'm now curious about the time line. Is the Profi based on the Cox or is the Cox based on the Profi?
All the best,
Konrad
actually that is the stock Cox porting for this engine, although, it wasn't called schnuerle ported.
best prop on it was an 8x4 Cox Grey prop.
we ran these to thrust 450sq inch Free Flight models up into the thermals for class A.
problem was they did not last as long as the Cox Special which was before the MK2.......but then again, it was that time period that Cox's of all sizes were a crap shoot to get the ones that screamed vs the ones that became wallflowers. we ran 'em hard.
the Profi is a strong engine for it's time, and rivals several late 70's engines in it's class.
I was not questioning the origins of the Cox porting shown, I know it was stock. My point was that it was not the standard "radial" porting we see in the Cox Tee Dee (from the 0.010 to the 0.090). Nomenclature aside the porting is a modified form of the schnuerle port. (The original patent described just two inlet ports in the sleeve.)
Yes, I'm sure the Profi could out run some baffle engines of the time, early 70's (73). But by the time I saw them late 70's (77) they were just also rans.