My brother has the great planes pt-19 and we put my saito .91 in for the powerplant. The plane flies perfectly. All the power you need. It flies very scale-like with the .91. I also have a Saito 100 but haven't tried it in the pt yet. Anything larger than the 100 size might pose a weight problem in the front??? Have fun, this is one of my favorites to look at and fly.