Scheibe SF-34 Delphin
Intended to succeed the Bergfalke, the SFH34 tandem two-seater training and sporting sailplane can be used for ab initio and advanced training and cross-country flying, and is Scheibe's first unpowered design of all-glassfibre construction.
Design work, headed by Dipl-lng Hoffman, began in 1978 and the SF-H34 prototype first flew on 28 October 1978; production began early in 1979. The cantilever two-piece mid-set wing has a glassfibre roving main spar and is of glassfibre honeycomb sandwich construction, as is the tail unit with its low-set tailplane; there are Schempp-Hirth air brakes in the wing upper surfaces, and production aircraft have no leading edge sweepback. The fuselage is a glassfibre honeycomb sandwich shell, and there are towing hooks fitted under the nose and at the centre of gravity. Landing gear consists of a fixed semi-exposed monowheel directly below the eg and a nosewheel, plus a tailskid. The pilots sit in semi-reclining seats with dual controls under a large one-piece frameless flush canopy that opens sideways; the seat backrests and rudder pedals are adjustable in flight.
The SF-34B Delphin was produced in France as the S.N. Centrair Alliance 34 two-seat glider.
Wing span: 15.8m / 51.9ft
Span: 51 ft 10 in
Length: 24 ft 7.25 in
Height: 4 ft 9 in
Wing area: 159.3 sqft
Aspect ratio: 16.9
Empty weight: 675 lb
Max weight: 1,102 lb
Max speed: 155 mph (in smooth air)
Min sinking speed: 2.30 ft/sec at 47 mph
Best glide ratio: 35:1 at 59 mph