55 Consort. The Swales SD3-15 was a further development of the design, with a 15 m (49 ft 2.5 in) span, making its first flight in July 1975. The Swales SD3-15T was a further, late 1976, revision with an all-moving T-tail fitted with anti-balance tabs. Operational history At least one example has had an extended active life. The first BG 135, Certificate of Airworthiness BGA 1741, competed at the Inter-services Regional Glider Competition held at Hullavington Airfield in August 1998, 26 years after its first competitive appearance. BGA 1741 was recorded at RAF Keevil in 2009. In 2011 it was privately owned and based at Lasham Airfield. Variants Moore Gypsy or (Birmingham Guild BG 100/12) Original version, 12 m span, 1970. BG 100/13.5 13.5 m span prototype, rebuilt BG 100/12, 1971. BG 135, later Yorkshire Sailplanes YS 55 Consort Production 13.5 m span version, 1972. 7 built. Swales SD3-15 15 m span development, first flown March 1975. 6 built by 1982. Swales SD3-15T, first flown December 1976. T-tail version of Swales SD3-15, 1977. Specifications (Moore Gypsy/BG 100/12) References External links Wortmann FX61-168 airfoil Image of BG 135 over Grisedale Pass 1970s British sailplanes Shoulder-wing aircraft V-tail aircraft Aircraft first flown in 1970