High Quality Content by WIKIPEDIA articles! The Sailplane Corporation of America was a US manufacturer of sailplanes founded by Gus Briegleb at a former US Army Airfield at El Mirage Dry Lake in California to market kits and plans of his own designs. The firm`s greatest success was the Briegleb BG 12 wooden sailplane, but it also sold plans for Briegleb`s earlier, wartime designs.