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Airmass Inc Sunburst


The single-seater Sunburst stick operates differentially, working spoilers to control the roll and, together with the rudder bar through a mixer, operating the elevons of the inverted V-tail as elevators or rudders. The nosewheel of the tricycle undercarriage on the Sunburst is steered by the rudder bar. The Cuyuna 430RR twin-cylinder inline engine of 429 cc, drives a pusher propeller through a reduction gear and has dual ignition. It is situated under the wing, in line with the centre of gravity, over the pilot's head. John Massey of Airmass flew one of these machines in the 1982 London-Paris, finishing in 18th place.

Supplied in kit form, the Sunburst is estimated by Airmass Incorporated to require around 30 h for completion.

Single-seat single-engined high-wing monoplane with conventional three-axis control. Wing has unswept leading and trailing edges, and constant chord; inverted V-tail. Pitch/yaw control by elevon; roll control by one-third span spoilers; 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; 90% double-surface. Undercarriage has three wheels in tricycle formation; bungee suspension on nosewheel and glass-fibre suspension on main wheels. Push-right go-right nose-wheel steering connected to yaw control. Optional brake. Aluminium-tube framework with optional pod. Engine mounted below wing driving pusher propeller. Tubing from blue anodized 6061T6 aluminium, rigging is stainless-steel with vinyl coating, wing covering is Dacron.

First year built: 1980. Units delivered to June 1981: 6. Price 1982:  $4,645 (with engine) Includes ASI, altimeter, 30-hp engine with reduction drive.

Engine: Cuyuna 430RR, 30 hp
Static thrust, 170 lb
Wingspan: 36 ft
Wing area: 156 sq.ft
Aspect ratio: 8.3
Overall length: 16ft
Empty weight: 185lb
Usable payload (include fuel), 240 lb
Max pilot weight: 240 lb
Wing loading, 2.5 lb
L/D power-off glide ratio, 12:1
Cruise speed (85% power), 50 mph
Stall speed, 23 mph
Approach speed, 30 mph
Flair speed, 25 mph
Liftoff speed, 28 mph
Takeoff roll distance, 75 ft
Rate of climb, 600 fpm
Fuel capacity, 5 gal
Range at cruise, 100 mi


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