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The Heinkel HD 21 was a trainer built in Germany during the 1920s. It was a conventional single-bay biplane with staggered wings braced with N-type interplane struts. The main units of the fixed, tailskid undercarriage were linked by a cross-axle, and the aircraft had three open cockpits in tandem, although one of these was typically faired over. The HD 29 of 1925 was essentially similar, but was purely a two-seater.
Specifications
Category
Fixed Wing
Domain
Defence
Era
Interwar (1919–1938)
Country
Germany
Manufacturer
Heinkel
Service Entry
1924
Engine
Mercedes D.I
Thrust / Power
100 hp (75 kW)
Length (ft)
23
Wingspan (ft)
34
Empty Weight (lb)
1500
MTOW (lb)
2160
Max Speed (mph)
103
Armament
1 × .22 LR caliber built in machine pistol; 2 × 100 .22 LR caliber links