The Skylark 4, the final in the Slingsby Skylark series, dates from 1961. The design heralded a trend towards the use of plastics in the construction of gliders. Slingsby incorporated GRP (glass reinforced plastic) panels to achieve a streamlined fuselage nose and cockpit area while retaining the more traditional wood techniques for the rest of the aircraft. Another notable feature was the smooth wing surface that was obtained using a Gaboon ply skin across the ribs. Best glide performance of 1:33 was found to be comparable with the early full GRP glider designs. The Museum’s example (VH-GTB – C/N 1382) was built in 1963 and originally owned by Chuck Bentson of the UK. It was brought to Australia in 1967 by Jeremy Picket-Heaps and flown at various places including Benalla, Cooma and Gundaroo. In 1970 the glider was transferred to the New England Soaring Club. Many flights were made from Armidale and Bellata in Northern New South Wales. On one occasion, the glider was kept aloft for 8 hours 45 minutes and on another the pilot took it around a 500 kilometre triangle in nearly 8 hours. In 1980 it was sold to Ralph (“Feathers”) Crompton and was flown extensively in South Australia until 1988. The final owner before the glider was given to the Museum in 2004 was Ross Dutton of Melbourne. The last recorded flight occurred in 1992. The glider at that point had logged over 2000 hours flying time from about 2000 launches. The airframe is currently being restored to flying condition.
Technically this aircraft represents the state of the art at the stage that sailplane design was changing from traditional wood construction to composites (GRP)
The Slingsby Skylark 4 is high wing single seat sailplane of mainly wooden construction with plywood and fabric covering. However, the cockpit and forward part of the fuselage consists of glass reinforced plastic which was innovative at the time that the type was designed. The cockpit provides for a semi reclining position for the pilot protected with a full Perspex canopy. The wings are made up of a centre section with constant chord and tapered wing tips. The aircraft has a conventional arrangement for the tail stabiliser / control surfaces.
Inscriptions & markings
The sailplane bears construction number 1382 and is registered in Australia as VH-GTB