RE: Kat 40 Dude!!
I flew the Kat 40 on all 4 strokes with the 14x4W APC, and with no tach info (just subjective "feelings"), I'll say I believe the YS 63 is stronger than the Saito 72. I thought the Saito 82 was a bit stronger than both. I also flew my Kat with the Saito 82 and a Pro Zinger 15x4. I LOVED IT! If I do another, that will be the combo for me.[8D]