TYPE: Tandem-seat biplane kitbuilt.

PROGRAMME: Originated as rival to Pitts S-1, designed by Frank Christensen. First flown in February 1977. Kit production began October 1977, initially by Christen Industries.

CUSTOMERS: More than 350 completed and flown by mid-2001, including 320 in the United States. Promotion and production continuing in 2003.

COSTS: Kit US$85,000 (2002) less engine and propeller.

DESIGN FEATURES: Generally as for S-2B; similar to S-2C. Available in 24 individual subassemblies; quoted build time 1,800 hours.

FLYING CONTROLS: Conventional and manual. Ailerons on both sets of wings.

STRUCTURE: Fabric-covered wings wooden spars and ribs plus metal leading- and trailing-edges. Welded 4130 steel tube fuselage, fabric covered aft of cockpit; metal panelled before.

LANDING GEAR: Tailwheel type; fixed. Steel cantilever main legs. Hydraulic brakes.

POWER PLANT: One 149 kW (200 hp) Textron Lycoming AEIO-360-A1D driving a Hartzell HC-C2YK-4/C7666A-2 constant-speed two-blade metal propeller. Fuel capacity 94.6 litres (25.0 US gallons; 20.8 Imp gallons), of which 90.8 litres (24.0 US gallons; 20.0 Imp gallons) are usable.

ACCOMMODATION: Pilot and passenger in tandem; flown solo from rear seat. Optional single-seat upper decking assembly comprises front cockpit flush fairing and shortened canopy.

SYSTEMS: Inverted oil system and manual fuel pump system as standard.