I've done a lot of research on engine weight issues and the P-6E. That 16oz of required nose weight is an issue. While I am leaning toward the G-26 one of the new compact 30cc gasoline engines like the MVVS or RCS engines seem to meet the CG/weight issue. A 20cc gasser will probably fly her pretty good; but a 35cc that solves all weight issues would give her outstanding performance. Especially since mine will have smoke on her. I may have to complete the entire plane and then do some balancing and make an engine decision.