The Abbott Farnham sailplane, named after its builders, was designed by T. C. Letcher and first flew in August 1930.
The central half span had constant chord; outboard long elliptical tips contained the ailerons.
The fuselage was roughly elliptical in cross-section, tapering towards the tail where it carried mid-mounted, straight-tapered elevators with rounded tips.
The rudder was hinged at the extreme end of the fuselage and was of rounded triangular shape with a steep rising leading edge.
Its undercarriage was a single long skid, reaching from the nose to well behind the wing trailing edge, with a small tailskid.