LS4 and LS6 series

AMS Flight is the actual original manufacturer of the LS4, LS4-a, LS4-b, LS6, LS6-a, LS6-b, LS6-c, LS6-c18 and LS6-18w models composite parts and AMS Flight continues to care with pleasure for these world popular and pilots likes gliders. AMS Flight own and use the LS4 and LS6 series production tools and airframe parts shapes moulds, except of the LS6 series fuselage moulds, while these are used by DG Flugzeugbau GmbH to manufacture LS8 and LS10 gliders out.

Spare parts and technical support of LS4 and LS6 series are available at AMS Flight and at DG Flugzeugbau GmbH. Mandatory technical support and Type Certificate rules “from the first hand” comes from DG Flugzeugbau GmbH as LS4 and LS6 series gliders actual Type Certificate holder. Manuals, Technical Modifications and technical drawings of the LS4 and LS6 series of Schneider original company are mostly all in pdf format so can be sent simple from AMS Flight to the gliders owners and to the service workshops. Many of them are AMS Flight web site published.

From LS4 to LS4-b

Given the initial continued interest in the type, the LS4-b has been putted back in the production by the AMS Flight. AMS Flight manufactured two LS4-b’s. Gliders constructions are of the complex systems and building technology what influence important to the high production costs. It looks AMS Flight new manufactured LS4-b prices were too high comparing relative low prices of the comparative used gliders so AMS Flight did not completed the necessary batch of the orders for LS4-b’s at one time to organize serial lower cost production inside the pilots acceptable delivery terms. Based on this fact AMS Flight decided in the end of the November of the year 2009, not to continue the serial production of LS4-b’s.

The Rolladen-Schneider LS4 was manufactured by Rolladen-Schneider Flugzeugbau GmbH between 1980 and 2003. The LS4, successor to the LS1 in the Standard Class, made its first flight in 1980. It is the third most produced non-military glider (after the Grunau Baby and the Blanik basic trainers). A total of 1,050 were built until the end of the year 2008. LS4 long production run is comparable only to that of the Schempp-Hirth Discus.

This type consolidated Rolladen-Schneider's reputation for well rounded sailplanes that are both easy to fly and top performers. It is docile enough for beginners and its performance is only slightly below the latest standard class sailplanes. We can conclude that LS4 series is a real world standard class glider.

The LS4-b introduces next improvements to previous models:

  • new results from crash tests became the basis for the design of the safety cockpit
  • all control hook-ups are of the automatic type
  • has a vertical height increased by 0.11 m (.38 ft) to 1.43 m (4.69 ft)
  • the -b fuselage is 0.13 m (0.43 ft) shorter at 6.66 m (21.84 ft)
  • the landing gear is not only robust but is able to absorb high sink speeds
  • the wing shells are made in carbon as well
  • the instrument panel tilts up with the canopy
  • it has an optional tail fin water ballast system
  • as an option winglets can be fitted to the LS4-b; this modification makes circling even easier – especially at high wing landing

All those “typical LS” details are the reason that clubs now use the LS4-b universally for all purposes from instruction to cross-country flying and many of the individual pilots flying LS4-b just for joy it as well.

From LS6 to LS6-18W

LS6 series is a 15 meter and 18 meter single-seat flapped glider manufactured by Rolladen-Schneider Flugzeugbau GmbH between 1984 and 2003.

The prototype of the LS6, successor to the LS3, made its first flight in 1983. Having entered production one year later, the LS6 had as well an uncommonly long production run into 2003. A total of 375 of all versions were built.

A watershed design, the LS6 introduced carbon reinforced plastic as a structural material in LS-gliders, thin profiles for wings and empennage, wing extensions and other features that have been retained in all subsequent types developed by the company. The resilience of the design is well illustrated by the fact that the LS8 is essentially a 'standardized' LS6. The Akaflieg Darmstadt D41, the LS9 and the Akaflieg Köln LS11, all have wings built in the LS6 moulds base.

Bettering the record of the LS4 in the Standard Class, the LS6 dominated the 15 meter Class FAI over nearly a decade, winning the first two places at the 1985 World Gliding Championship at Rieti in Italy, the first three places at the 1987 Worlds at Banalla in Australia, the first four places in the 1991 World Championships at Uvalde in the United States and the first two places in the 1993 World Championships at Borlänge in Sweden.

The type consolidated Rolladen-Schneider's reputation for well rounded, easy to fly gliders that do well in any conditions, being known for its superb handling, tolerance of piloting technique and environment (turbulence, rain, contamination by insects) as well as for good glide ratios over a wide speed range.

The LS6 is succeeded by the LS10.

Variants of LS6 series are:

  • LS6
  • LS6-a - with a new construction for the elevator employing an aramid / corrugated paper sandwich, and a modified ballasting system, namely larger water ballast bags and an optional tank in the vertical fin for center of gravity corrections.
  • LS6-b - (1987) introduced a lighter and stronger construction for the wing shells employing a glass, foam and carbon sandwich. A ballast system with independent valves in each wing was offered as an option. The LS6-b and all subsequent versions reverted to the original carbon / aramid elevator.
  • LS6-c - major redesign, the most important novelty being the interchangeable wing tips allowing a span extension to 17.5 meter. This longer span required a larger rudder, increasing the overall length by eighteen centimeter. Concurrently, the cockpit was reinforced for increased crash safety and the allowable weight of non-lifting parts was increased. At the same time the control and ballast systems were brought up to a new standard shared with the Ls7: fully automatic control hook-ups, a mass-balanced flaperon drive system (previous versions having anti-flutter dampers), airbrake locks relocated in the wings, a trigger-activated trim system in place of the trim wheel, a new ballast system that did away with plumbing inside the fuselage and Mylar seals for all control surfaces.
  • LS6-c18 - reduction in ballast capacity to 100 liter to accommodate the 18 meter wing extensions with winglets and an increase in maximum speed up to 280 km/h.
  • LS6-18w - further convergence with the LS8 winglets for the 15 meter span and stronger spars allowing an increase in ballast capacity to 140 liter.

 

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Wingtip skids, Flügelsporn
Aerodynamic wingtip skids, originally of Schneider LS type gliders (LS4, LS6, LS3, LS8) are made of two component very durable polymer PUR.
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