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My building blunder has to be one of the stupidest. On my Goldberg Anniversary Cub, I had this cool fueling
port on the fuselage side. It looked like it would be easier to mount the fuel tank backwards, so without thinking about what I was doing, I did it! When the tank was full, it wouldn't matter that the clunk was in front. But when the fuel level got a little low, there would be no fuel at the clunk when the plane rotated for takeoff. Result: the maiden flight was pure joy, but flight #2 was a disaster. As the Cub took off, the fuel went to the rear of the tank, and the clunk was in the front, hence, no fuel to the engine, hence, Cub in nine pieces.