Rolladen-Schneider LS 1
Walter Schneider and Wolf Lemke commenced glider production in 1968 with the LS1 in the standard class. The LS-1 Standard Class design resulted from the collaboration of Wolf Lemke and Walter Schneider after they had worked together on the Akaflieg Darmstadt D-36 project. The LS1 was produced by Walter Schneider, at first under the name Segelflugzeugbau Schneider OHG, but later as Rolladen-Schneider Flugzeugbau GmbH.
Two prototypes of the LS1 competed in the German National Championships of 1968, taking first and second places out of 44 competitors, and the prototypes were fitted with a novel form of air brake consisting of a portion of the trailing edge hinging upwards inboard of the ailerons, and hinged close to its midchord line so that the air brake's leading edge moved down while its trailing edge moved upwards. These brakes were found to be effective only at certain speeds, however, and so production LSls featured conventional Schempp-Hirth air brakes.
Characterised by a cantilever mid wing and a T-tail, the LS1 is of glassfibre and PVC foam construction, with the pilot seated in a semi-reclining position under a large one-piece flush-fitting canopy. The LS1-C featured an all-moving tailplane instead of the tailplane and elevators of earlier versions, and the LS1-d introduced provision for water ballast, over 200 of these two versions being built. The LS1-f has a redesigned rudder and reverts to a fixed tailplane and elevator; there is provision for up to 198 lb of water ballast and the monowheel is now retractable instead of fixed as on earlier versions, and has rubber shock absorbers. Some improvements have been made to the cockpit interior and the tow release mounted on the landing gear strut has been modified; this can also be fitted in the nose, as required.
The LS1-f first flew in 1972 and made its competition debut in that year's World Championships at Vrsac, Yugoslavia; an LS1 flown by Helmut Reichmann of Germany had taken first place in the Standard Class at the 1970 World Championships at Marfa, Texas. The LS1 -f went on to take 8th, 10th and 14th places at the 1976 World Championships at Rayskala in Finland. By January 1977 a total of 240 LSI-fs had been built, and a club version of the LS1-f, designated LS1-C Club, was announced.
Span: 15 m / 49.2 ft
Span: 49 ft 2.5 in
Length: 21 ft 11.75 in
Height: 3 ft 11.5 in
Wing area: 105 sq ft
Aspect ratio: 23.0
Empty weight: 507 lb
Max weight: 860 lb
Max speed: 155 mph (in smooth air)
Min sinking speed: 2.1 ft/sec at 43.5 mph
Best glide ratio: 38:1 at 56 mph