The Schleicher Ka-4 Rhönlerche II (English: Rhön Lark), sometimes called the KA-4 or even K 4, is a West German high-wing, strut-braced, two-seat glider that was designed by Rudolf Kaiser and produced by Alexander Schleicher GmbH & Co.[1][2][3] The Rhönlerche II was first flown 7 December 1953.

[4] Its design goals were to produce a simple, inexpensive and robust two-seat trainer for school and club use.

[1][2] The Rhönlerche II is constructed with a welded steel tube fuselage and a wooden wing and tail surfaces, all finished in doped aircraft fabric covering.

The 13.0 m (42.7 ft) span wing is supported by single lift struts and employs a Goettingen 533 airfoil.

One of these aircraft was later shipped to Canada and operated by the Cold Lake Gliding Club at CFB Cold Lake and in July 2011 was owned by the Gravelbourg Gliding And Soaring Club, Gravelbourg, Saskatchewan.