I am assembling my "small yellow" monocoupe now. I posted a question on this board a few months back about which engine to use and most people that responded said I needed to go with a .91 size four stroke. At the time I was trying to decide what to power it with I was offered a new Irvine .72 at a great price and this is what I bought. I am changing the way I am powering my planes. In the future I may lean more towards 2 strokes in planes that will be used mostly for "Sunday" type flying (warbirds and Cub types) and my four strokes I will use in my more acrobatic type planes where a larger prop will benefit. I have 2 fourstrokes and a half dozen twostrokes all of various sizes and I don't plan on buying anymore for a while, I will just try to match the plane to the engine a little better, plus this will give me more money to spend on the electrics now that I have discovered how neat the brushless motors are .