The Buhl CA-1 Airster was a sports airplane developed in the United States in 1930.

It was a conventional low-wing cantilever monoplane with fixed tailwheel undercarriage and an open cockpit for the pilot.

[1] The two-seat variant was developed with a second open cockpit in tandem with the pilot's and with a Townend ring and wheel spats, but this didn't sell either.

[2][3] The first aircraft was intended for high-speed mail delivery, the second for sporting events and air-racing.

The CA-1WA was slightly more fortunate - a single aircraft was bought by a private individual and used until the mid thirties.