The Yakovlev Yak-14 (Russian: Яковлев Як-14; NATO reporting name: Crow or Mare)[1] was the largest assault glider ever to enter service with the Soviet Air Force.

Only after the war were Soviet designers ordered to develop medium gliders capable of carrying heavy or bulky loads.

Large slotted trailing-edge flaps were fitted to the wings, while the aircraft was fitted with a fixed nosewheel undercarriage which could be made to "kneel" by releasing air from the pneumatic shock struts of the undercarriage, lowering the fuselage for ease of unloading or to make short landings on belly-mounted skids.

[7] Official testing resulted in a number of changes to the design, with a large dorsal fin being fitted, and spoilers being added to reduce landing runs, while the payload of the glider was increased to allow an ASU-57 assault gun to be carried.

The gliders flew from Tula on March 10, with several stops at Omsk, Krasnoyarsk and the Schmidt Cape, on Sakhalin island in the Far East, before reaching SP-4 in early April during a heavy freeze.