Well, after doing my homework I decided to go with the Evolution .45 because its a all around better engine. The K&B .61 I have is very old and was made betreen 1980 and 1990. It is rated at only 1.3 hp and weighs 17.00 oz. The Evolution weighs around 17 oz with the muffler and the weighted flywheel removed. I have to assume it being a modern engine it has a lot more hp than 1.3 hp. I will save the K&B for a later project. I wish Evolution listed hp ratings. Thanks everyone for your input and insight. This plane is going to fly AWESOME!

Cafish John