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Schwerdtfeger & Zimmermann Air Swing


Single-seat single-engined high-wing monoplane with conventional three-axis control. Wing has unswept leading and trailing edges, and constant chord; cruciform tail. Pitch control by elevator on tail; yaw control by fully flying rudder; roll control by ailerons; control inputs through stick for pitch/roll and pedals for yaw. Wing braced from above by kingpost and cables, from below by cables; wing profile double-surface. Undercarriage has three wheels in tricycle formation with tailskid; suspension on all wheels. Push-right go-left nosewheel steering connected to yaw control. Brakes on main wheels. Aluminium-tube/steel-tube framework, without pod. Engine mounted below wing driving pusher propeller.

Publicly shown for the first time at Aero 83 exhibition at Friedrichshafen, the Air Swing first flew in April 1983. Two prototypes were built, powered by a Lloyd 22 hp engine.

The Air Swing uses a double triangular frame whose front tube is extended above the wing where it is supported with a second strut, the two acting as a kingpost and forming an inverse V above the wing. The aircraft has an additional peculiarity in that it uses the large diameter boom which carries the empennage as the axis of rotation for its three-bladed propeller.

Engine: Lloyd LS400, 22 hp at 5500 rpm
Propeller diameter 50 inch, 1.28 m
Toothed-belt reduction, ratio 2.0/1
Max static thrust 177 lb, 80kg
Power per unit area 0.17hp/sq.ft, 1.8 hp/sq.m
Length overall 18.0 ft, 5.50 m
Height overall 7.2ft, 2.20m
Wing span 33.5ft, 10.20m
Constant chord 3.9 ft, 1.20 m
Sweepback 0 deg
Tailplane span 9.0ft, 2.75 m
Total wing area 132 sq.ft, 12.2 sq.m
Wing aspect ratio 8.5/1
Wheel track 5.2 ft, 1.60 m
Fuel capacity 5.3 US gal, 4.4 Imp gal, 20.0 litre
Empty weight 221 lb, 100 kg
Max take-off weight 508 lb, 230kg
Payload 287 lb, 130kg
Max wing loading 3.85 lb/sq.ft, 18.8 kg/sq.m
Max power loading 23.1 lb/hp, 10.5kg/hp
Load factors; +6.0, -3.0 ultimate
Never exceed speed 71mph, 115kph
Economic cruising speed 50mph, 80kph
Stalling speed 29mph, 47 kph
Max climb rate at sea level 240 ft/min, 1.2 m/s



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