Single-seat single-engined high-wing monoplane with conventional three-axis control. Wing has unswept leading and trailing edges, and constant chord; inverted V-tall. Pitch/yaw control by elevon; 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; suspension on all wheels. Push-right go-right nosewheel steering connected to yaw control. Brakes on main wheels. Aluminium-tube framework, with pod. Engine mounted at wing height driving pusher propeller.
Flown for the first time publically at the Aero 83 salon at Friedrichshafen, the prototype Milan from Howatherm UL Systeme made its first flight in March 1983. The prototype is fitted with a KFM 107 twin-cylinder engine mounted level with the wing and driving a pusher propeller between the two booms carrying the tailplane, which is stiffened by cables.
By 1983 two prototypes had been built and the first production run of 10 machines was being laid down. This machine will be fitted as standard with drum brakes on the main wheels.
Length overall 18.0 ft, 5.50 m.
Height overall 8.5ft, 2.60m.
Wing span 34.4ft, 10.50m.
Constant chord 3.9 ft, 1.20m.
Dihedral 4 deg.
Sweepback 0 deg.
Tailplane span 8.2 ft, 2.50 m.
Total wing area 136 sq.ft, 12.6 sq.m.
Total aileron or spoiler area 25.8 sq.ft, 2.40sq.m.
Tailplane area 32.3 sq.ft, 3.00 sq.m.
Wing aspect ratio 8.8/1.
Wheel track 4.9ft, 1.50m.
Nosewheel dia-meter overall 10 inch, 26cm.
Main wheels diameter overall 12 inch, 30cm.
Engine: KFM 107, 25 hp at 6300 rpm.
Propeller diameter and pitch 54 x 20 inch, 1.37 x 0.51 m.
V-belt reduction, ratio 2.1/1.
Max static thrust 143 lb, 65 kg.
Power per unit area 0.18 hp/sq.ft, 2.0hp/sq.m
Fuel capacity 5.3 US gal, 4.4 Imp gal, 20.0 litre.
Empty weight 214 lb, 97kg.
Max take-off weight 442 lb, 200 kg.
Payload 228 lb, 103 kg .
Max wing loading 3.25 lb/sq.ft, 15.9 kg/sq.m.
Max power loading 17.7 lb/hp, 8.0kg/hp.
Load factors; +6.0, -3.0 ultimate.
Max level speed 62 mph, 100 kph.
Never exceed speed 68 mph, 110 kph.
Max cruising speed 56 mph, 90 kph.
Economic cruising speed 37 mph, 60 kph.
Stalling speed 27 mph, 43 kph.
Max climb rate at sea level 400 ft/min, 2.0 m/s.
Best glide ratio with power off 13/1.
Take-off distance 100 ft, 30 m.
Landing distance 100 ft, 30 m.