At the risk of getting caught in the cross fire I want to ask for opinions about the Zenoah GT-80. Since no one has listed it as a possible candidate for the Cap I thought I would see if anyone is using one. I bought the combo with the GT-80 and have bench run the engine through two gallons of fuel on the rich side. It will swing a Zinger Pro 24X10 at 6500 rpm with the Bisson one piece muffler which doesn't sound too bad for a piston ported anchor. Thought I would switch to a Menz Ultra 24X10 once it is installed on the airframe and ready for flight. I am in the process of hinging ailerons now.