Rolladen-Schneider LS 3
Developed by Wolf Lemke and Walter Schneider from the LS1-f via the LS2, which never went into production, the LS3's design and construction began in 1975.
Like the LS1 -f, the LS3 is a cantilever mid-wing monoplane with a T-tail; the wings are of glassfibre/foam sandwich construction as are the one-piece 'flaperons', or combined ailerons and flaps, which form the entire trailing edge; from 1979 the 'flaperons' have been replaced by conventional flaps and ailerons. There are air brakes in the upper wing surfaces and there is provision for up to 309lb of water ballast. The semi-monocoque fuselage, very similar to the LS1-f's, has a hinged one-piece flush-fitting canopy under which the pilot sits in a semi-reclining position. There is a retractable rubber-sprung monowheel with a drumbrake, and a tailskid. The fin and rudder, and the tailplane and elevators mounted on top of them, are all of glassfibre/foam construction. There is a mechanism to prevent the air brakes from opening at an incorrect flap setting, and the one-piece 'flaperons' enabled shorter, steeper landing approaches to be made than with conventional ailerons drooping in conjunction with the flaps. The flaperons are coupled with dive brakes to reduce approach and landing speeds. The prototype first flew on 4 February 1976 at Egels bach in Germany.
All LS-3 series use a fuselage similar to that developed for the Standard Class LS-1f, which features a front- hinged canopy and a fixed stabilizer on a T- tail.
The LS3-a, which first flew in prototype form in the spring of 1978, differs from the LS3 chiefly in having horizontal and vertical tail surfaces of greater area and different aerofoil sections, and the empty weight reduced to 551 Ib; the maximum weight and performance remain the same. The LS-3a version has separate flaps and ailerons.
A 17m span version, designated LSS-a-17, was developed with detachable wing tips which can be removed to restore the span to 15m with no change in gross weight, the LS3 itself conforming to the Standard Class 15m span.
More than 200 LS3s had been ordered by mid-January 1978; by the beginning of 1980 a total of 358 of all versions had been built.
Span: 15m / 49 ft 2.5 in
Length: 22 ft 3.75 in
Height: 3 ft 11.25 in
Aspect ratio: 21.4
Airfoil: Wortmann mod
Wing area: 109.8 sqft
Empty Weight: 263kg / 580lb
Payload: 208kg / 458lb
Gross Weight: 471kg / 1038lb
Wing Load: 44.86 kg/sq.m / 9.17 lb/sq.ft
Water Ballast: 0
Max speed: 168 mph (in smooth air)
Max aero-tow speed: 118 mph
MinSink: 0.61 m/s / 1.97 fps / 1.18 kt at 43.5 mph
L/DMax: 40:1 at 68.5 mph