I have an old K&B .40 w/Perry carb in mine and it has plenty of power ... more than enough. It flies great but the old .40 sucks the miniscule 4 oz. tank dry REALLY fast.

Did any of you manage to put in a larger tank? I had no room with the thro servo up there.

I also put in a standard size servo for the ailerons instead of messing with anything else. I cut an opening in the bottom wing and built a hump cover for the servo where it poked through.