Hi Paul The rudder servo doesn't flex at all it is mounted on basswood rails seems to be plenty strong I didn't reinforce the fuse any other than some extra glue.To get all the power out of the 5735 I have it Y'ed in with my extra battery.I did cut the cowl out for a little bit of extra cooling and keep the spark plug cap from rubbing.Hopfuly the pipe will be here next week I am going to paint it with a thin coat of red heat resistant engine paint to help it blend in a little better. Mark,