I have The World Models copy of the Kadet Senior, the Super Frontier Senior. I have a Saito .65 in mine and it is way more than enough power. The airplane tends to be tail-heavy and the big four-cycle engine helps balance it out with something more useful than lead. It's humorous trying to hover the thing.

Don't forget... this airplane will fly with a .40 two-cycle.

I think the Saito .72 would be overkill, but not ridiculous....

Good flying,
Bob Scott