A friend has one with a Thunder Tiger .42GP in it. I tested it for him and it just barely made it. We never flew it off the water.

One of the problems is they build tail heavy so you will have to add weight to the nose. This compounds the problem of the smaller engine-having to carry extra weight.

We are getting to start an Arrow and I am thinking of suggesting to him to move the firewall an inch forward, especially since we usually put the throttle servo in the engine pod.