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Sportavia SFS 31 Milan
Scheibe SFS 31 Milan
Designed by Rene Fournier and Egon Scheibe, Sportavia built the SFS 31 Milan, a single‑seat development of the Fournier RF4D with a sailplane wing of the Scheibe SF-27M motorglider and a feath­ering prop. The Milan's designation is formed by adding together the manufacturers' initial letters and the numbers in the designations of these two aircraft.
Like all of Rene Fournier's designs, it had a big bubble canopy. It has spoilers for approach control and outrigger wheels and a steerable tailwheel to aid in taxiing. The cantilever wings are low-set instead of in the shoulder position of the SF-27M and Zugvogel V, with 4° dihedral from the roots, and are wooden structures with a pine box spar and plywood ribs covered with birch plywood and fabric; Schempp-Hirth glassfibre/metal air brakes are fitted in the upper surfaces. The SF-27M's wings were made stronger than those of the unpowered SF-27 Zugvogel V, and it is powered by a 26hp Hirth Solo vertically-opposed four-cylinder engine. The Milan's powerplant is a 39hp Rectimo (converted Volkswagen) 4 AR 1200 'flat four' engine in a conventional tractor installation, driving a Hoffman two-blade fixed-pitch or fully-feathering wooden propeller, of 4ft 4in of 4ft 5.5in diameter respectively. The single fuel tank in the fuselage has a capacity of 7.7 Imp gallons. The landing gear is similar to the RF4D's, but with spring-assisted retraction of the main wheel.
The Milan prototype, D-KORO, made its first flight on 31 August 1969. The SFS 31 was produced jointly by Sportavia and Scheibe.
Milan SFS-31
Engine: 29kW / 39 bhp Rectimo 4AR 1200
Wing span: 15 m / 49 ft 2.5 in
Wing area: 12 sq.m / 129 sq.ft
Aspect ratio: 18.6
Airfoil: Wortmann
Length: 19 ft 10.25 in
Height: 5 ft 1.75 in
Empty Weight: 310 kg / 682 lb
Payload: 130 kg / 286 lb
Gross Weight: 440 kg / 968 lb
Wing Load: 36.67 kg/sq.m / 7.5 lb/sq.ft
Max cruising speed: 112 mph at sea level
L/DMax: 29 95 kph / 51 kt / 59 mph
MinSink: 0.82 m/s / 2.7 fps / 1.60
Take-off run: 690ft
Range with max fuel: 415 miles
Structure: wood
Seats: 1
No. Built: 24

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