haha I finally remembered where these flap/spoilers came from. Try model airplane news plans for a twin pattern .40 by Dick Sarpolous called the Big Apple. His earlier similar twin was the Magnum 80. I built a number of these twins and still have plans for both of them somewhere. Great fliers. 2 of mine had K&B 6.5 pylon motors with 60 carbs and perry pumps and tuned pipes retracts. Very fast. The last one had K&B 7.5 ducted fan motors. It was just unreal with a load of nitro.....when I could get both motors running together.