LS-4b - Standard Class Sailplane


The LS4-b is one of the most successful sailplanes. It has been in production since 1981. Over 1000 units have been built, and they are still in production for this very popular model.

Development of the LS4-b was influenced mainly by technological and aerodynamic knowledge based on the 15m flapped LS2 and LS3. The resulting sailplane offers a wide range of possibilities for contest pilots and clubs alike. Most remarkable are its excellent flight characteristics ( like LS4 and LS4-a ) during take-off, landing and circling flight and its great manoeuvrability. Lower insect collection on leading edge of wing, meticulous attention to detail and high seating comfort for pilots of all sizes, add up to maximum performance for extended flights.

The LS4-b also provides easy ground handling due to low weight, simple rigging and automatic control system connections. This sailplane has proven to be docile enough for the cross-country beginner, and has enough performance to keep the experienced pilot happy on a long final glide.


. The wings are fabricated of Fibreglass-sandwich-construction, as are the ailerons and horizontal stabilizer. The sailplanes are still being constructed with the use of gel-coat as an exterior coating.
The manufacturing process, when observed from a distance, is quite simple. The fuselage is made in two halves, a left and right halve, then joined at a later time when interior components have been installed into one of the halves. The wings, ailerons, horizontal stabilizer and elevator follow a similar procedure, but they are fabricated with an upper and lower halve. After the parts are removed from the molds they are finished by sanding, polishing etc. as required. The sailplane is then assembled to the specified work-order.

Standard Equipment for LS-4b

o automatic control system connections
o retractable and sprung undercarriage
o C.G. hook, retractable with landing gear
o Nose hook
o adjustable rudder pedals, with feet operated wheel brake
o hinged forward canopy and instrument panel
o infinitely adjustable trim system
o oxygen flask receptacle
o radio antenna in vertical fin
o standard instrument panel
o double tapered wing
o ready to use water ballast system, internal bags
o upper surface, double height air brakes
o all control surface gaps sealed
o backrest including headrest
o pivot point at canopy rear for clean separation during canopy jettison
o safety harness ( multiple point buckle type)
o registration, call sign, markings


***For a list detailing the options please go to the list contained in this web-page***





Tech Specs


Wing Area

Aspect ratio




Empty weight

Max. wing loading

Max. all up weight

Max. speed (Vne)

Min. speed (stall)

Glide ratio

15.0 m

10.5 m²


6.83 m

640 mm

830 mm

approx. 240 kg

50 kg/m²

525 kg

270 km/h

68 km/h

approx. 41:1
49.2 ft

113 ft²


22.4 ft

25.2 in

32.7 in

529 lbs

10.2 lbs/ft²

1157 lbs

160 mph

40 mph

approx. 41:1