Rolladen-Schneider LS 10
The end of 2005 concluded a series of workshops around key ideas for the new LS10. One key principle was not to "DG-ize" the LS10 but rather maintain the typical LS characteristics.
The LS 10 will differ from the existing model by all LS10 gliders being engine-ready. To simplify production all LS10 gliders will have the engine box built into the fuselage. All LS10 ordered in the glider-only version will offer the option of retrofitting a sustainer engine later.
The typical LS toe brake actuation will be replaced by a drum break actuated by the dive brake lever (in its fully deployed position). The "Haenle" guides for the ailerons remain.
There are no changes to the LS-type elevator assembly, but the outer wing panels trade-in the old threaded bolt for a spring loaded locking pin for easier assembly.
The skids on the wingtips remain (no wheels) as there will be no self-launching version.
All versions of the LS10 feature 4 wing panels, i.e. each wing will be partitioned into two panels for all versions and configurations of the LS10. This design ensures easier assembly and allows for the use of a shorter trailer. As for the location of the paring between inner and outer panels, the further out toward the wing tip the designer places the divide, the easier the assembly and the cheaper and lighter the required connection for the wing spar. In the limit of parting at y=7.25m however, the resulting wing tips of 0.25m for the 15m wing plan form lead to sub-optimal performance characteristics. If the divide is moved too far toward the wing root, the outer panels become so heavy that they cannot be handled by one person. In addition, this also raises the total weight of the wing substantially, which in turn leads to a more expensive overall wing design. The best compromise is for the parting to be at y=7m. This results in 2m outer panels for the 18m version, a size that can still be handled effectively by one person. Combing the resulting 0.5m wingtips for the 15m version with "high" winglets leads to an aerodynamically optimal plan form for this version as well.
The 18m wing plan form will feature the well-known LS curved winglets.
All LS10 gliders are designed to accommodate a bug wiper system. Integrating this option into the design of the LS10 allows for the installation of a lower drag bug wiper system.
Meanwhile the second LS10 was construction at the Bruchsal facility according to the original Rolladen-Schleicher design. This aircrafts construction was begun by Rolladen-Schneider and was suffering from delays due to the well-known legal problems. The test pilot was Micro Scholz.
Its design is still identical to the "original", as is production no. 1. The design of number 3 is currently being completed. It will include a number of improvements and will serve as the basis for serial production.
In parallel with the flight tests staff worked on detailed solutions and modifications. The extensive testing of the two prototypes resulted in new fairings at the lower part of the vertical fin, but the biggest changes took place in the cockpit e.g. the position of the rudder pedal cavity foot tub was changed. Now there will be room for big feet. To further improve the view out of the cockpit the instrument panel could be further lowered - without loosing space for the instrumentation, and a Piggott-Hook was installed.
The operating forces of the water ballast system were reduced. The shape of the opening levers was optimised. The flap lever the changes in flap setting works more precisely and pilot-friendly - the handle is coated with fine leather. The decompression lever for starting the engine was moved and now is very well accessible. The position of the trim knob was optimized ergonomically and functions much better. The rudder pedal handle now retracts in the seat pan after use in the LS10.
A very tall pilots will fit in the LS10 by using an optional separate headrest which can be installed instead of the back support. The change can be done in a minute.
Span: 15 m
Area: 10.4 sq.m
Aspect ratio: 21.7
Empty Weight: 250 kg
Gross Weight: 525 kg
Wing Load: 50.5 kg/sq.m