The Extra Flugzeugbau EA300 is a two-seat aerobatic monoplane capable of Unlimited category competition. It was designed in 1987 by Walter Extra, a German aerobatic pilot, and built by Extra Flugzeugbau. Design and development Design of the Extra 300 was based on the Extra 230, an early 1980s monoplane having a wing made of wood. The Extra 300 has a welded steel tube fuselage covered in aluminium and fabric. The midset wing has a carbon fiber composite spar and carbon composite skins. A symmetrical airfoil, mounted with a zero angle of incidence, provides equal performance in both upright and inverted flight. The landing gear is fixed taildragger style with composite main legs and fiberglass wheel pants. The powerplant is a fuel-injected Lycoming AEIO-540 which produces 300 horsepower (224 kW). The first two-seat Extra 300 made its maiden flight on 6 May 1988, with German type certification following on 16 May 1990. The single-seat Extra 300S flew on 4 March 1992. The Extra 300 is stressed for ±10 G with one person on board and ±8 G with two. Some Extra 300s are registered in the experimental category under a Special Certificate of Airworthiness in the U.S., while others are type certified in the aerobatic category. Variants 300 Original two-seat version 300S The 300S is a single-seat version, with a wingspan reduced by , and fitted with larger ailerons. 330SX The Extra 330SX was a custom development of the 300S with a wider-chord rudder, a larger elevator, and a more powerful Lycoming AEIO-580 powerplant producing . Some 300Ss were sold with the "bigger tail" of the 330SX. The 330SX was later replaced by the 330SC. 300SP The 300SP is a performance version of the 300S single-seater. Weight was reduced, and the tail of the 330SX installed. It is discontinued, being replaced by the 330SC. 300SHP The 300SHP (HP = high performance) is an uncertified version of the 300SP with a Lycoming AEIO-580 engine. 300SR The Extra 300SR is a modified aircraft using a specially designed high-lift wing for the Red Bull Air Race World Series. The Extra 300L is a Lycoming AEIO-540-powered two-seat aircraft, with low-mounted wing and shorter fuselage. More of these two-seater variants have been produced than any other model. Its wing is mounted at the bottom of the fuselage, with its span reduced from . Improved ailerons boost the 300L's roll rate to 400° per second. All 300Ls