The Swearingen SX-300 is an American high-performance kit aircraft, admired for its sleek design, speed and efficiency, making it one of the fastest piston homebuilts of its time. Discover Swearingen SX-300 aircraft for sale worldwide on AvPay. Browse active Swearingen SX-300 listings and find available aircraft across the USA, North America, UK, Europe, Asia, Africa, Australia and South America. Connect directly with aircraft brokers, private sellers, flying clubs, flight schools and manufacturers. Explore the full inventory of aircraft for sale on AvPay here!
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Interesting facts about the Swearingen SX-300
✈ Ed Swearingen designed the SX-300, and the prototype first flew on 1 July 1984. The company sold kits from 1986 to 1989.
✈ The SX-300 is an all metal, two seat, low wing airplane with retractable tricycle landing gear that folds rearwards into the fuselage. The right main gear includes a retractable step.
✈ Most examples use a Lycoming IO 540 L1C 5 rated at 300 hp, paired with a Hartzell constant speed three blade propeller measuring 74 inches in diameter.
✈ The SX-300 is known for its performance. Typical cruise is 240 kt at 75% power and 8,000 ft, while Vne is 280 KIAS.
✈ Fuel sits in wet wings with 66 US gallons usable. At 65% power and 12,500 ft, the airplane can cover 980 nm with a 45 minute reserve.
✈ The cabin measures 41 inches wide. Typical empty weight is 1,600 lb, maximum take off weight is 2,400 lb, full fuel payload is about 404 lb, and baggage allowance is 70 lb.
✈ Handling features include differential ailerons and 3 degrees of wing washout to soften stall behaviour. The airframe is stressed to +6 and −3 g, with a flaps down stall speed of 75 KIAS.
✈ Only a limited number of airframes were completed. Owners maintain the type with support from the SX-300 community and specialist parts suppliers.
Swearingen SX-300 Specifications
Information provided here is as a guide only. Do not use this information for flight planning or aircraft operations. Aircraft model variations, custom specifications, modifications, upgrades, and age can change the details listed below. Please check with the seller, manufacturer, or an aviation authority for precise aircraft specifications.
Length: 6.44 m (21 ft 1.5 in)
Wingspan: 7.43 m (24 ft 4.5 in)
Height: 2.30 m (7 ft 6.5 in)
Empty Weight (typical): 726 kg (1,600 lb)
Max Take Off Weight (MTOW): 1,089 kg (2,400 lb)
Fuel Capacity (usable): 250 L (66 US gal; 55 imp gal)
Maneuvering Speed (VA): 383 km/h (238 mph, 207 KIAS)
Cruise Speed (75% power, 8,000 ft): 444 km/h (276 mph, 240 kt)
Cruise Speed (65% power, 12,500 ft): 428 km/h (266 mph, 231 kt)
Range (65% power, 12,500 ft, 45 min reserve): 1,815 km (1,128 mi, 980 nm)
Rate of Climb (sea level, gross): 12.2 m/s (2,400 ft/min)
Stall Speed (VSO, flaps down): 139 km/h (86 mph, 75 KIAS)
FAQs About the Swearingen SX-300
How much does a Swearingen SX-300 cost?
As of 2024 to 2025, typical U.S. market estimates for well built SX-300 examples range from $180,000 to $250,000 USD, depending on build quality, engine time, avionics, and recent maintenance. Exceptional aircraft can sell for more.
How fast is the Swearingen SX-300?
Typical cruise is 240 kt at 75% power and 8,000 ft. At 65% power and 12,500 ft expect about 231 kt. The published Vne is 280 KIAS. Always confirm speeds and limits for the specific airframe.
What engine does it use and what is the typical cruise fuel burn?
Most SX-300 aircraft use the Lycoming IO 540 L1C 5 rated at 300 hp with a constant speed propeller. A common cruise setting at 65% power uses roughly 16 US gallons per hour.
What is the useful load and full fuel payload?
Typical useful load is about 800 lb. With 66 US gallons usable fuel, the full fuel payload is about 404 lb for people and baggage. Check the aircraft’s weight and balance for exact figures.
How many were built and are parts available?
Kits were offered in the late 1980s and a limited number of aircraft were completed. While no new kits are available, owners can source parts from specialist suppliers and the SX-300 owner community provides strong support.
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