Regarded as having one of the highest performances of any sailplane when it was first rolled out at the end of 1962, the BS 1 had a prone position for the pilot to keep the fuselage cross section as small as possible, as well as a braking parachute housed in the T-tail.
It was designed by Bjorn Stender, who had worked on the SB-6 when a student at Akaflieg Braunschweig and who in 1962 had been asked to design and build a high performance sailplane by the South African pilot and industrialist Helli Lasch. He set to work with only three other helpers and in spite of the BS 1's advanced nature they succeeded in finishing it by the end of 1962; it was of glassfibre construction - still a comparative novelty at that time - and also had camber changing flaps. The BS-1 has airbrakes, retractable wheel and a tail chute.
After completing its flight tests the BS 1 broke the 300km (186 mile) international triangular speed record during the spring of 1963 and also had a number of competition successes. The BS-1 won the world 300 km speed record (135.3 kph / 85.94 mph) set by Alfred Rohm of West Germany in 1967. In 1970 Terry Thys of San Leandero, Ca made a 917 km / 570 mile flight; which was then the third longest in soaring history.
But following the death of Bjorn Stender on a test flight in October 1963 the type was taken over by the Glasflugel company, who produced the modified BS 1B, which first flew on 24 May 1966. This featured a redesigned fuselage to provide a roomier cockpit, and a modified wing of increased span and a new Eppler 348 aerofoil section to give improved soaring capabilities in weak thermals. Glasflugel built a total of 18 BSIBs, one of these being supplied to the naturalist and sailplane pilot Sir Peter Scott.
Wing span: 18m / 59ft
Aspect ratio: 23
Wing area: 14.1 sq.m / 151.7 sqft
Length: 24 ft 7.5 in
Height: 5 ft 0.5 in
Empty Weight: 335kg / 739lb
Payload: 125kg / 275lb
Gross Weight: 460kg / 1014lb
Wing Load: 32.62kg/sq.m / 6.68lb/sq.ft
Max speed: 155 mph
L/DMax: 44 at 95 kph / 51 kt / 59 mph
MinSink: 0.54 m/s / 1.78 fps / 1.05 kt at 53 mph
Water Ballast: 0kg / 0lb
No. Built: 18