Are you talking about the Tower Kaos? If so, you'll want to use a good bearing .46 like a TT.46 Pro or else it'll be a dog. Which engine are you planning on using?

I literally flew the covering off my Tower Kaos (covering split from the glue/coloring and ripped off, and the several layers of packing tape wouldn't stick any more) flying with a Thunder Tiger .46 Pro, OS .46 AX, and for a short time with a Thunder Tiger .40 Pro to break the engine in. The performance was not all that good with the .40 Pro - just not enough power. It achieved at best 75' vertical with the .40, but an easy couple hundred feet with the worn .46. Keep in mind the Kaos design is a pattern style plane from the 70's and likes to fly fast. Yes it'll land slow due to that fat wing, but it's not much fun flying on the lower end of the speed range.

As far as the clamp mount goes, I put well over 1000 flights on mine before retirement and never had any issue with the engine becoming lose or shifting position. I've flow that style mount on many planes - my own and many students trainers and had the same experience. There's nothing wrong with the clamp style mount - it's well proven over many years.

Hogflyer