The Mistral two axis was a side by side two seat single engined flex wing aircraft. Wing has swept back leading and trailing edges, and tapering chord; no tail, canard wing. Pitch control by fully flying canard; yaw control by tip rud¬ders; no separate roll control; control inputs through stick for pitch/yaw. Wing braced from above by kingpost and cables, front below by cables; wing profile based on Pterodactyl; 60% double surface. Undercar¬riage has three wheels in tricycle formation; bungee suspension on all wheels. No ground steering. No brakes. Aluminium tube framework, without pod. Engine mounted below wing driving pusher propeller. Drawn aluminium tubing manufactured to British HT30TF specification. Terylene sailcloth wing.
The Mistral was in concept a two seater Pterodactyl, produced with Pterodactyl director Jack McCornack’s bles¬sing. Much of the design was scaled up from the American machine, including the wing profile, which is Pterodactyl derived.
Though neither fast nor elegant, the Mistral did prove quite robust and offered full dual controls, a combination which appealed to training schools. A total of eight two axis machines were built, of which the first three used Cuyuna 430R engines. Later aircraft were fitted with a Robin EC44, which is considerably more powerful.
The Mistral three axis is the same as the two axis Mistral except: conven¬tional three axis control (unconventional three axis optional). Roll control by spoilers; control inputs through stick for pitchlroll (pitch/yaw optional) and pedals for yaw (roll optional).
The original idea behind the three axis Mistral was to make the aircraft suitable for crop spraying, but though test pilot Graharn Andrews did extensive trials with spraying equipment, in fact no aircraft were ever sold for agricultural purposes.
Three aircraft were produced with three-¬axis control, of which two were conventional¬ly arranged, and the third had yaw and roll controls reversed, with the stick operating the rudders and pedals controlling the spoilers. All three aircraft used the Robin EC44 engine.
Two axis
Engine: Cuyuna 430R, 30 hp.
Propeller diameter 54 inch, 1.37 m.
Reduction ratio 2.0/1.
Power per unit area 0.12 hp/sq.ft, 1.3 hp/sq.m.
Fuel capacity 4.8 US gal, 4.0 Imp gal, 18.2 litre.
Empty weight 285 lb, 129kg.
Max take off weight 685 lb, 311kg.
Payload 400 lb, 182kg.
Max wing loading 2.74 lb/sq.ft, 13.4 kg/sq.m.
Max power loading 22.8 lb/hp, 10.4kg/hp.
Length overall 14.3 ft, 4.36 m.
Height overall 11.0ft, 3.35m.
Wing span 40.0ft, 12.19m.
Chord at root 6.6 ft, 2.01 m.
Chord at tip 5.5ft, 1.68m.
Dihedral 3 deg
Sweepback 10 deg approx.
Canard span 7.0ft, 2.13m.
Canard chord 1.5 ft, 0.46 m.
Total wing area 261 sq.ft, 24.2 sq.m.
Main wing area 250 sq.ft, 23.2 sq.m.
Canard area 11 sq.ft, 1.0 sq.m.
Total rudder area 6.0 sq.ft, 0.56 sq.m.
Wing aspect ratio 6.6/1.
Wheel track 7.0 ft, 2.13 m.
Wheelbase 7.0 ft, 2.13 m.
Nosewheel diameter overall 15 inch, 38 cm.
Main wheels diameter overall 18 inch, 46 cm.
Skis: standard adult skis, length reduced to 3 ft, 0.91 m.
Three axis
Engine: Robin EC44, 40 hp at 6000 rpm.
Propeller diameter 54 inch, 1.37 m.
Toothed belt reduction, ratio 2.3/1.
Max static thrust 280 lb, 127 kg.
Power per unit area 0.16hp/sq.ft, 1.7 hp/sq.m.
Fuel capacity 4.8 US gal, 4.0 Imp gal, 18.2 litre.
Empty weight 285 lb, 129kg.
Max take off weight 685 lb, 311kg.
Payload 400 lb, 182kg.
Max wing loading 2.74 lb/sq.ft, 13.4 kg/sq.m.
Max power loading 17.1 lb/hp, 7.8kg/hp.
Length overall 14.3 ft, 4.36 m.
Height overall 11.0ft, 3.35m.
Wing span 40.0ft, 12.19m.
Chord at root 6.6 ft, 2.01 m.
Chord at tip 5.5ft, 1.68m.
Dihedral 3 deg.
Sweepback 10 deg approx.
Canard span 7.0ft, 2.13m.
Canard chord 1.5 ft, 0.46 m.
Total wing area 261 sq.ft, 24.2 sq.m.
Main wing area 250 sq.ft, 23.2 sq.m.
Canard area 11 sq.ft, 1.0 sq.m.
Total rudder area 6.0 sq.ft, 0.56 sq.m.
Total spoiler area 1.5 sq.ft, 0.14 sq.m.
Wing aspect ratio 6.6/1.
Wheel track 7.0 ft, 2.13 m.
Wheelbase 7.0 ft, 2.13 m.
Nosewheel diameter overall 15 inch, 38 cm.
Main wheels diameter overall 18 inch, 46 cm.
Skis: standard adult skis, length reduced to 3 ft, 0.91 m.
Max level speed 45 mph, 72 kph.
Never exceed speed 55 mph, 88kph.
Max cruising speed 45mph, 72kph.
Economic cruising speed 40mph, 64kph.
Stalling speed 20 mph, 32 kph.
Max climb rate at sea level 400 ft/min, 2.0 m/s.
Best glide ratio with power off 9/1 at 35 mph, 56 kph.
Take off distance 200 260 ft, 60 80m.
Landing distance 200 260ft, 60¬80m.
Range at average cruising speed 80 mile, 129 km.
All Aero 