I have over the last ten years built several Go-Devil Jr. models powered with Magnum 25 or equivalent engines. They required two to three ounces of lead in the nose to get them balanced. The last was done exactly the same as those I built in the fifties, no tissue except on the wings, no primer, just clear dope, then color. The new engines are also heavier than the Glo-Torp 29 I used to use. Back then it was "bolt in the engine and go fly!" I could not figure out any reason for this until someone mentioned that he thought the dope we are buying today is heavier than that of the fifties. Anyone else noticed this?? Bill Byles, any comment?