RE: which engine?
Wren 120 is lighter and shorter than a P80 and flies a 80-sized and 120+ sized airframes. Also the P80 SE has more thrust and better fuel economy than the K80- it is also very silent and with kero start. Price is almost as low as K80:s. We have no K80:s probably becsuse the P80 SE exists. The new Wren 100 is also worth looking at.
TP.