I was planning on using a .91FX I had laying around.I think that engine will be a great deal happier in a model this size than 91sized model I used it in before.You can use a 14" prop with this model right? If so, I'll use a 14x10 and get a very quiet set-up. No revs, but I'll have heaps of power anyway.And Im going for a straight forward deal here... Nothing fancy. Tank behind the fire wall, standard servos. No nonsense functionality.