Frank Luptow (born Frank Lueptow) (1914-1952) was an American racing driver. He competed in International Motor Contest Association (IMCA) big cars (now sprint cars) and NASCAR stock cars. He won the 1949, 1950, and 1951 IMCA big car championships. Background Luptow was born at Markesan, Wisconsin to Frank and Ida Lueptow in 1914 with Dutch heritage. He later dropped the "E" from his last name. Racing career Luptow moved to Detroit, Michigan and won in his first race at Jackson. He raced in several Central States Racing Association (CSRA) races before World War II. During the war, he was a test driver for tanks. After his discharge from the military, he moved back to Detroit and worked for a tank manufacturer. In August 1946, Luptow won his first "big car" (now sprint car) feature at an IMCA event at Davenport Speedway. In 1947, he had 2 Top Ten IMCA finishes at the Iowa State Fairgrounds and finished 20th in season points. Luptow won 1948 IMCA races at Lebanon, Ohio, Eldon, Iowa, Danville, Illinois, Nashville, Tennessee, Plant Field (Tampa, Florida), Speedway Park (Tampa), and Birmingham, Alabama. He finished third in season points behind Emory Collins and Deb Snyder. After the regular season ended, he kept racing at Tampa-area venues from October to March 1949. Luptow started the 1949 season by replacing his Hal engine with an Offenhauser and his car began to be known as the "Black Panther." That season he won 33 of 40 features to take the IMCA national championship. Luptow's most dominating season happened in 1950 as he won 35 of 48 features along with 11 second place finishes. He also competed in a NASCAR Grand National (now Cup Series) stock car race, finishing 18th at the season-opening Daytona Beach Road Course. He started the 1951 season by racing in four NASCAR Grand National races, with finishes of 53rd at Daytona, 5th at Charlotte, 11th at Lakewood Speedway, and 30th at Occoneechee Speedway. In 1951, he won 33 features to win his third straight IMCA championship. In 1952, he switched to racing the American Automobile Association (AAA) big cars, champ cars and stock cars. Luptow switched to stock cars at the behest of his wife, who wanted him to quit entirely because of the danger of open-wheel cockpits. He failed to qualify for four champ car events including the 1952 Indianapolis 500. In the stock car, he won