Antonov A-11

The Antonov A-11 is a single-seat, high performance, all-metal sailplane built in the Soviet Union in the late 1950s. 150 were produced.
Design and development.
The almost all-metal A-11 was Antonov's first non-wood framed sailplane. It is a cantilever mid-wing monoplane, with straight tapered wings mostly swept on the trailing edge and set with 1.5° of dihedral but no washout. A single spar with a metal-skinned leading edge forward of it and fabric covering aft forms most of the span but the curved tips are supported by twin spars. The fabric-covered ailerons are slotted, with set-back hinges and mass balances. They can be drooped together through 8° to act as flaps. Inboard, there are slotted flaps on the trailing edges and spoilers, mounted at mid-chord and quite close to the fuselage, of the gapless kind opening upwards only.
The fuselage of the A-11 is a metal monocoque of pod and boom form, with a gradual transition between the two. It carries an all-metal, straight edged 90° V- or butterfly tail, its control surfaces mass-balanced with external weights. The three-piece canopy stretches smoothly from the nose to above mid-chord without a stepped windscreen. There is a retractable monowheel undercarriage, sprung but without brakes, assisted by a rubber-mounted skid forward of the wheel and a tail bumper aft, formed by a short, shallow ventral fin
The A-11 first flew on 12 May 1958. It was approved for aerobatics, spins and cloud flying.
Aircraft on display.
"Information from" Ogden