The Steen Skybolt is an American homebuilt aerobatic biplane. Designed by teacher Lamar Steen as a high school engineering project, the prototype first flew in October 1970.
The aircraft has a classic structure consisting of a welded tube fuselage and wooden wings, all fabric covered. It is a tandem open-cockpit two-seat biplane and is stressed for normal aerobatics. The cockpits are frequently constructed as a single tandem cabin with an enclosing bubble canopy. Some aerobatic competition aircraft are built as single seaters with the front cockpit closed off.
The original Skybolt had a Lycoming HO-360-B1B engine, but powerplants of can be installed.
The Skybolt has become popular as an amateur-built sporting biplane, with over 400 aircraft having been completed from construction plans sold in over 29 countries. A Skybolt won the Reserve Grand Champion Custom Built for 1979 at the Experimental Aircraft Association airshow in Oshkosh Wisconsin. Sixteen examples were registered in the United Kingdom in January 2009.