ORIGINAL: chopper man
It is the Tower Kaos. I was planning on using a Magnum .52 4 stroke. I have used the mounting straps before and have not had any trouble. The problem with this set up is that in order for the engine to fit I have to slide it forward and by doing that the engine flange covers the forward hole in the mount rendering the straps useless. That is why I wanted to drill additional holes.
Gene
As Jester said, DO NOT use the magnum .52 4-stroke. I've flown a Tower Kaos with a Mag. .52 4-stroke on it and calling it a dog is an understatement. It struggled in the air and had no vertical performance. You'll want a heavier .70 sized 4-stroke if you go the 4-stroke route, but the plane performs best with a .46 bearing engine which is was designed for. Like I stated in a previous post (and jester also), the Thunder Tiger .46 Pro was a perfect match for the plane (and my engine, though getting down on power due to around 1000 or so flights) still has enough left in it for some decent aerobatics.
Anyway, just my thoughts based on actual experience/use with the Kaos.
Hogflyer