For Sale: Swearingen SX-300 N6L Available for: $225,000 N6L was first flown in 1990. The Swearingen SX300 is the fastest all-metal single engine Experimentally Certified Airplane It cruises at 240 KIAS at 75%POWER AT 8000 ft. N6L has 1711 hours total time and it had the Lycoming IO-540 engine overhauled at 1175 hours (536 hours SMOH). The airplane has had a recent Annual Inspection and is in excellent mechanical condition. The paint job is original and is in very good condition.