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SR-1 Hornet

Single-seat single-engined biplane 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 half-span ailerons on upper wing; control inputs through stick for pitch/ roll and pedals for yaw. Wings braced by struts and transverse X-cables; wing profile; double-surface. Undercarriage has three wheels in taildragger formation; suspension on tailwheel and bungee suspension on main wheels. No ground steering. No brakes. Aluminium-tube/steel-tube framework, with-out pod. Engine mounted between wings driving pusher propeller.

Introduced in 1982, the Hornet is a biplane which is built very much according to the customer's wishes and it is thus rather difficult to describe a 'standard' machine. However, all Hornets use a combination of steel and aluminium tubing for their construction, with a ladder frame for the wings and drag and anti-drag diagonal cables inside the double-surface wing. Two steel tubes in the shape of an inverted V run between the trailing edges of the upper and lower wings and provide a mounting for the engine, usually a 30 hp Cuyuna 430R.

Engine: Cuyuna 430R, 30 hp at 5500 rpm
Propeller diameter and pitch 45 x 33 inch, 1.14 x 0.84 m
V-belt reduction, ratio 2.0/1
Power per unit area 0.13 hp/sq.ft, 1.5hp/sq.m
Fuel capacity 3.0 US gal, 2.5 Imp gal, 11.4 litre
Length overall 18.3 ft, 5.56 m
Height overall 6.7ft, 2.03m
Wing span 34.0ft, 10.36m
Sweepback 0 deg
Total wing area 218 sq.ft, 20.3 sq.m
Main wheels diameter overall 20 inch, 50 cm
Empty weight 200 lb, 91 kg
Max take-off weight 575 lb, 261 kg
Payload 375 lb, 170 kg
Max wing loading 2.64 lb/sq.ft, 12.9 kg/sq.m
Max power loading 19.2 lb/hp, 8.6 kg/hp
Load factors; +5.5, -4.5 ultimate
Max level speed 60 mph, 97 kph
Never exceed speed 65 mph, 105kph
Economic cruising speed 48mph, 77kph
Stalling speed 21mph, 34kph
Max climb rate at sea level 800 ft/min, 4.1 m/s
Min sink rate 250ft/min at 33mph, 1.3m/s at 53 kph
Best glide ratio with power off  9.3/1 at 33 mph, 53 kph
Take-off distance 75 ft, 23 m
Landing distance 160 ft, 49 m

 

 


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