Steen Aero Lab Skybolt

Single Piston

The Steen Skybolt is a high-performance aerobatic biplane sold as plans and kits by Steen Aero Lab since the 1970s. Designed by Lamar Steen as a two-seat open-cockpit sport aircraft, the Skybolt draws inspiration from classic 1930s biplanes but incorporates modern materials and construction techniques accessible to homebuilders. Most examples are powered by Lycoming four-cylinder engines in the 180-200 horsepower range, typically the IO-360, giving the lightweight airframe spirited climb performance and the power-to-weight ratio needed for sustained aerobatic sequences including loops, rolls, and hammerheads. The design's symmetrical airfoil and generous control authority make it a capable platform for intermediate aerobatics, though it lacks the ultimate roll rate and inverted systems of purpose-built unlimited competition aircraft. With a cruise speed around 140 knots and a never-exceed of 180 knots, the Skybolt occupies a sweet spot between gentle vintage biplanes and fire-breathing aerobatic monoplanes—fast enough to cover cross-country distance, docile enough for pilots transitioning from tricycle-gear trainers, yet responsive enough to deliver genuine aerobatic thrills. Hundreds have been completed by amateur builders worldwide, and the type remains popular at fly-ins and airshows for its classic lines and radial-cowl aesthetic even when fitted with flat engines. SkyMeter has tracked flights across airframes and operators, with the largest observed operator.