Hi John:
Sorry to tell you this, but the Stunt Machine is not a Classic legal airplane. It was designed in 1970 and built over the Winter of 1970-71. The model was presented in Flying Models magazine as a construction article in December of 1971.
More sorry to inform you that the plans that were presented in Flying Models along with the article were no where near accurate. How do I know this? Gene gave the Stunt Machine to me. I moved into an apartment and didn't have room to keep it there, so Lou Wolgast kept it for me at his house. When Lou moved to Tucson many years ago, he took it with him. Warren Tiahrt, who also lives in Tucson, decided to build one. When I told him that the magazine plans were not accurate, he went over to Lou's house and borrowed the original Stunt Machine in order to do a check between it and the magazine plans. Warren and I did this together during one of my VSC visits, and then Warren drew in the changes over the original plan in order to make an accurate replica of Gene's ship.
I now have a copy of those corrected plans and will soon have a new, accurate set of plans available for that ship.
As a brief aside, I cut the wing for the original Stunt Machine, and even helped a bit with its construction, as Gene and I did a lot of designing and building together in those days.
Gene designed another twin-rudder ship before the Stunt Machine. He designed that one in 1969, making it Classic legal. We call it the "Oosa-Amma." Bill Simons coined that name when he saw the very large "USA" on the left wing and the equally large "AMA" on the ship's right wing. He asked Gene, "What the heck does Oosa-Amma mean. Gene, puzzled, asked what he meant. Bill said that was the name on the ship. Gene retorted that is was simply USA and AMA, but Bill's name stuck, and that ship has been known on the East Coast forever as the Oosa-Amma.
I guess you could say that the Oosa-Amma was actually the Stunt Machine I. Gene didn't name his ship's back in those days, and it was Don McGovern - Editor of Flying Models then - who came up with that name so the model would have a published name.
I borrowed the original Oosa-Amma from Ray Moore's widow (Gene had giving that ship to Ray when he left the hobby. Then Ray passed away.) and carefully measured and redrew very accurate plans. Bob Kruger has produced a set of beautiful plans from the pencils I drew, and it will appear in Stunt News this coming year (2015). Attached are a couple of photos of Gene's original Oosa-Amma and my replica.
Later - Bob Hunt