RE: Balsa USA 1/6 Sopwith Pup question
I find that you have to be right on with the c.g. Mine took 12 oz of lead in the nose and still wound up with about a 16 oz wing loading. It flies around at less than 1/2 throttle with a Saito .56 in the nose. The construction was quite straight forward. You should have no problems. I built the down and side thrust into the firewall and used pull-pull on the rudder and elevators.
Tom J.