HD 17
Cox-Klemin CO-1 P-377
Role Reconnaissance aircraft
National origin German-Swiss
Manufacturer Svenska Aero AB
Designer Ernst Heinkel
First flight 1924
Primary user Reichswehr

The Heinkel HD 17 was a military reconnaissance aircraft produced in Germany in the late 1920s.


The Heinkel HD 17 was a conventional single-bay biplane with strongly staggered wings of unequal span braced with N-type interplane struts. The pilot and observer sat in tandem, open cockpits, and the main units of the fixed, tailskid undercarriage were linked by a cross-axle.[1]

Operational history

The Heinkel HD 17 first flew in 1924. In 1926, it was evaluated by the Reichswehr to equip the secret aviation training school at Lipetsk, and was selected in favour of the competing Albatros L 65. Seven aircraft were purchased and used briefly for training until replaced by more modern designs.[2]

Two Heinkel HD 17s were evaluated in 1924 by the US Army Air Service, being modified by Cox-Klemin to use a Napier Lion and Liberty 12 respectively. Designated by Cox-Klemin as CO-1 and CO-2 respectively (Project numbers P-377 and P-379 were allocated respectively), these planes had no provisions for military equipment during evaluation tests, but were rejected by the USAAS and returned to Cox-Klemin.[3][4]

Specifications (CO-1)

Heinkel HD 17 3-view drawing from Les Ailes January 7, 1926

Data from Les Ailes, December 1925 [1]

General characteristics



  1. ^ a b Serryer, J. (31 December 1925). "Le sesquiplan Heinkel H.D.17". Les Ailes (237): 2–3.
  2. ^ "HD.17". Retrieved 14 May 2017.
  3. ^ Wagner, Ray, 2004. American Combat Planes of the 20th Century: A Comprehensive Reference. Reno, Nevada: Jack Bacon & Co. ISBN 0-930083-17-2.
  4. ^ "Cox-Klemin CK-2".