Andreas Gliding Club T53
At least the snow is not affecting our trusty Post Office-from published sources Dad has informed me this glider is the last T53b built by Slingsbys out of the batch of 16 which was converted to partial T53c spec and then passed to Yorkshire Sailplanes who called it the YS53 prototype. Dads entire design was the first prototype the T53a and in his album, alongside a photo of the T53b prototype, he wrote "one year and 3 weeks later the system produced a lighter and weaker T53."
He has determined which glider it was from the BGA and works number plus the fillet fairing at the base of the fin leading edge.On his T53a it was a flat bracket and exposed bolt head. One design rule at Slingsbys was that the top surfaces had to be flush but exposed bolt heads on the underside were ok! The older picture of XB951 was written off at Cranwell in 1972 but rebuilt into a YS53 using the belly of the fuselage only, is not the Andreas T53 but they probably know that ,as it is detailed in Simmons book.