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Siebert Sie 3
This wooden Standard Class single-seater was designed by Paul Siebert and first flew in prototype form in 1971; by January 1975 a total of 27 had been built by the Paul Siebert Sportund Segelflugzeugbau and sold to Belgium, Holland, Denmark and Portugal as well as to customers in Germany. Permission was being sought from the Luftfahrtbundesamt, the Federal German civil aviation authority, to offer the Sie 3 in a form suitable for amateur construction. Of conventional wooden construction, the Sie 3 is a cantilever high wing monoplane with a constant chord centre section and tapered outer panels; Schempp-Hirth aluminium air brakes are featured. The fin and rudder are swept back and the low-set tailplane is an all-moving surface. Landing gear consists of a monowheel with brake and a tailskid, and the pilot sits under a one-piece flush-fitting cockpit canopy.
Span: 49 ft 2.5 in
Length: 22 ft 0 in
Height: 3 ft 11 in
Wing area: 127.44 sqft
Empty weight: 467 lb
Max weight: 750 lb
Max speed: 124 mph (in smooth air)
Min sinking speed: 2.23 ft/sec at 48.5 mph
Best glide ratio: 34.3:1 at 56 mph

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