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Rhein-Flugzeugbau Sirius
Sirius 2
The Sirius 1 was developed to investigate the efficiency of the ducted fan as a means of propulsion for motor gliders. It was developed from the VFW FK-3 all-metal sailplane and was first powered by a Nelson 48 hp two-stroke engine, then by two Yamaha motor cycle engines and finally two 20 hp Fichtel & Sachs Wankel engines were chosen.
First flown in January 1972, the Sirius 2 is the two-seat companion to the Sirius 1, but Rhein-Flugzeugbau, the manufacturers, in this case have arranged with Caproni of Italy to use the wings, tail unit and landing gear of the A-21 Calif. This side-by-side two-seat ducted fan motor glider is powered by two 30 hp Wankel rotary engines which drive a ducted fan embedded in the fuselage just aft of the wing trailing edge. One engine is mounted in front of the fan and the other behind it. The fan shroud utilises an annular slat intake round the wing leading edge to keep the airflow attached to the duct, and suck-in doors fair off this intake when the power plant is not operating to maintain gliding performance.
Sirius 2
Engines: 2 x Wankel driving ducted fan
Wing span: 20.38 m / 66 ft 10 in
Length: 8.04 m / 26 ft 4.5 in
Height: 1.8m / 5ft 11 in
Wing area: 16.1 sq.m / 173 sq ft
Wing section: Wortmann FX-67-K-170/60-126
Aspect ratio: 25.8
Empty weight: 510 kg / 1,124 lb
Max weight: 690 kg / 1,521 lb
Water ballast: None
Max wing loading: 43.4 kg/sq.m / 8.88 lb/sq ft
Max speed (powered): 146 kt / 270 km/h
Stalling speed: 39 kt / 72 km/h
Min sinking speed: 0.6 m/sec / 2 ft/sec
Best glide ratio: 38
T-O run: 200 m / 656 ft
Rate of climb: 120 m/min / 394 ft/min
Range: 270km / 147nm
Sirius 2

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