Chenoweth moved to unlimited class hydroplane racing in 1968. Metro Detroit hosts many annual sporting events including auto and hydroplane racing. Blackburn also authored a book on outboard hydroplane racing. He has also won National Championships in virtually every other class of hydroplane racing. Koma Unwind advertises in such sports such as NASCAR, Hydroplane racing, and competitive fishing. National powerboat racing teams compete for national and international titles in these hydroplane racing circuits. Modified Outboard Hydroplane Racing classes are powered by modified stock outboard class motors. After the destruction of the Tempo Alcoa, Lombardo retired from hydroplane racing. The "limited" classes of inboard hydroplane racing are organized under the name Inboard Powerboat Circuit. In the late 1950s and early 1960s, he competed in unlimited hydroplane racing. Sancoff gathered information on marine technology, including hydroplane racing boats and high-speed supercavitating torpedoes. Limited hydroplane racing classes are inboard-engine powered boats that use high performance gasoline fuel.