The BMW 117 was a piston aircraft engine developed by BMW in the 1930s. Development work stopped in 1937. The BMW 117 engine was initially known as the BMW XV.
Pierer, Christian; Jakobs, Fred; Kröschel, Robert (2009). BMW aero engines milestones in aviation from the beginnings to the present (in German). Königswinter: Heel. ISBN 978-3-86852-214-3.