Rolladen Schneider LS1
The LS1 is a single-seat glider club class with 15 m span and rigid airfoil. It was designed for the then standard class (Club class FAI ) as the first own design by Wolf Lemke. It was from the company shutters Schneider aircraft from 1968 to 1977 produced in nine variants ( LS1- 0, a, b, c, d, e, ef, f, f (45 ) ), while revised repeatedly.
Development
The prototype LS1 -V1 still had an internal steel tube construction. The LS1 -0 differed from the prototypes by the change of the setting angle on the wing and the full fiberglass construction of the hull. By changing the setting angle to improve the rudder control was achieved. The LS1 -a the trailing edge pivot brakes have been replaced by acting on both sides Schempp- Hirth airbrakes. At the LS1 -b only minor modifications to the airplane have been made.
From LS1 -c retractable landing gear and ordinary Schempp-Hirth type airbrakes instead of both sides acting Schempp- Hirth airbrakes (LS1 LS1 -a and -b) were installed and implemented a 10% larger rudder. The LS1 -d for the first time a 60 -liter water ballast could be included in the wing, which also led to a rule change in the then standard class. Furthermore, the maximum takeoff weight was increased to 341 kg.
The LS1 -e was privately built by a roller shutter Schneider staff under the direction of Wolf Lemke. It differs from the LS1 -c only in the use of the horizontal tail of the LS2. The LS1 -ef the tailplane of the LS1 -f was used.
The line of development culminated in the LS1 -f, the optically and ergonomically significantly different from previous versions, with a new hull with a slimmer cockpit and one-piece hood. The cockpit of the LS1 -f is quite small, but ergonomically designed. This hull was used externally largely unchanged over the LS6 and LS7 to the current patterns LS8 and LS10. Furthermore, a new subdued tailplane and a spring-loaded retractable landing gear was installed now. Also, the setting angle of the wing relative to the fuselage was adapted. The wings remained same on the outside, but led to changes in the production of better dimensional stability. Wood was no longer used in load-bearing components. In sum, the aerodynamic modifications to further improved flight characteristics, especially perceptible improvement resulted in rapid flight performance. Also remarkable is the very large payload range of LS1 -f, ranging from 60 to 110 kg in the cockpit. Also, the empty weight of 230-240 kg is comparatively low.
The LS1- f ( 45) was built for the World Cup 1976 in Finland, by the increased water bags a wing loading of up to 45 kg / m² is possible. Due to the increased maximum surface load, the improved high-speed flight characteristics could be better utilized in strong thermals.
The production was set in 1977 in favor of the racing class aircraft LS3. Actual successor to the LS1 was 1980, the LS4, which was the most successful Standard Class glider in plastic construction with more than 1,000 units built. The LS1 was known by numerous victories in national and international championships.
Flight characteristics
In all variants of the LS1 very pleasant flight characteristics and a good climb in thermals are attributed. The F version also achieves at high speeds improved glide performance. Compared with other patterns of their time, however, the LS1 is relatively sensitive to contamination of the wing surfaces, for example, by striking insects or rain drops. This is due to the wing profile used, which is quite thick with 19.6 % relative height in the first place. The versions with servo-pendulum require the winch launch special attention, since too much pressed rowing the flow can tear at the tailplane. In their performances, the LS1f with patterns like ASW19, Standard Cirrus, Jantar Standard, Hornet and DG-100 is comparable.
Sporting successes
Versions
Whereabouts
The prototype (LS1 -V1 (D - 4723 ) ) is exhibited at the water summit since 2002 in the German Gliding Museum.