A-sized low-wing sunday flier
Hey Digger and 2alpha. The 20 sized 4 stroke doesn't have anywhere near the power of the 19 2 strokes. In fact it probably only really has the power of an OS 10FP. But of course it swings a larger prop at lower rpms. But thanks to all that any sort of pattern type model is probably not the best choice IMHO.
Even the later 26 4c has much more power for it's displacement than the earlier 20 4c.