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Darmstadt D-36 Circe

By 1961 members of the Akaflieg Darmstadt were investigating the possibilities of new materials such as reinforced glassfibre bonded resins and the D-36 Circe high performance single-seater, on which design work started in the spring of 1963, made extensive use of these. Designers included Lemke, Waibel, FrieB, Holighaus, & Schneider.
The monocoque fuselage is of balsa reinforced with glassfibre and epoxy resin, while the front section of the cockpit canopy is fixed and the rear part removable. The undercarriage consists of a large manually-retracted monowheel forward of the centre of gravity. The T-tail unit is of similar construction to the wings.
The first of two D-36s made its first flight in March 1964 and went on to win the German National championships that year. The D-36 also took second place in the 1965 World Championships at South Cerney. The wing torsion box shell is of balsa reinforced with glassfibre and epoxy resin; camber changing flaps and Schempp-Hirth air brakes are featured, although the second prototype differed from the first only in having these air brakes removed and replaced by a tail braking parachute.
The D-36 Circe was developed into the Schleicher AS-W 12 for advanced competition and long-distance flying.
D-36 Circe
Span: 58 ft 3.5 in / 17.8m
Length: 24 ft 0.5 in / 7.35 m
Height: 4 ft 11 in
Wing area: 137.8 sq.ft / 12.8 sq.m
Aspect ratio: 24.75
Wing section: Wortmann FX-62-K-131/60-126
Empty weight: 622 lb / 285 kg
Max weight: 904 lb 401 kg
Water ballast: None
Wing Load: 31.33 kg/sq.m / 6.55 lb/sq ft
Max rough air speed: 108 kt / 200 km/h
Stalling speed: 36 kt / 67 km/h
Min sinking speed: 1.83 ft/sec at 52 mph / 0.53 m/s @ 82 kph
Best glide ratio: 44:1 at 58 mph / 87 kph
No. of Seats: 1
No. Built: 2




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