Heinkel HD 16

Heinkel HD 16
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Type:	Torpedo plane
Design country:	German Empire
Manufacturer:	Heinkel
First flight:	October 1928
Commissioning:	December 1928
Production time:	1928
Number of pieces:	2

The Heinkel HD 16 is a German floatplane developed in the 1920s that was produced by the Heinkel aircraft factory in Warnemünde for the Swedish army. The abbreviation HD stands for "Heinkel Doppeldecker".

development

After the Swedish Navy had rejected Heinkel's torpedo aircraft HD 14 due to insufficient performance in 1926, the latter submitted an offer for a successor model on April 7, 1927, which was to have an air-cooled drive instead of the water-cooled engine used in the HD 14. The Swedish authorities gave their approval and placed an order for two copies on February 27, 1928. Then Heinkel developed the HD 16 with slightly smaller dimensions than its predecessor and equipped it with a British "Leopard" - radial engine from. The two aircraft built with the serial numbers 308 and 309 could be equipped with both floats and wheeled undercarriages, whereby a change only took a short time. Construction was completed in autumn 1928 and both HD 16s were subjected to a thorough factory test in Warnemünde from October to November, during which test torpedoes were also launched. The following month, the Swedish lieutenant Krook and the engineer Larsson took over the 308 and transferred it to Karlskrona , where it arrived on December 11, 1928. The 309 followed in January 1929. With both aircraft, some torpedo drops were carried out for trial purposes, after which they were assigned to the F 2 (2nd flight squadron) in Hägernäs and were given the designation T 1 (for Torpedfly Plan). They were initially assigned board numbers 20 and 21, but they were changed to 220 and 221 in March 1929. In the course of several years of service, the service numbers were changed twice, first in November 1931 to 2120 and 2121 and later to 120 and 121. Both HD 16s flew until the end of the 1930s, then they were replaced by He 115 A-2 , the 309 in February 1938 and the 308 in May 1939.

construction

The HD 16 is a non- staggered , tensioned double - decker in a mixed construction . The fuselage consists of a fabric-covered tubular steel frame with paneling made of aluminum sheets in the front area and fabric covering in the rear area. The two-spar wings have the same span and are mostly made of a wooden structure covered with fabric, only the middle section of the lower wing is made of tubular steel, as is the tail unit . The horizontal stabilizer is braced towards the trunk with I-stems. The HE 16 can optionally be equipped with a rigid wheel chassis without a continuous axle and tail spur (HD 16L) or with two keeled , non-interconnected wooden floats with a flat top (HD 16W)

Technical specifications

Parameter	Data (HD 16L)	Data (HD 16W)
crew	3
span	18.0 m
length	12.2 m	13.0 m
height	4.6	5.20 m
Wing area	96.9 m²
Empty mass	2170 kg	2570 kg
Payload	2000 kg
Takeoff mass	4170 kg	4570 kg
drive	an air-cooled four-stroke - double radial engine
Type	Armstrong Siddeley Leopard
Starting power continuous power	750 PS (552 kW) 675 PS (496 kW)
Top speed close to the ground	205 km / h	196 km / h
Landing speed	80 km / h	86 km / h
Rate of climb	2.9 m / s	2.5 m / s
Rise time	5.48 min at 1000 m altitude, 14.30 min at 2000 m altitude	6.48 min at 1000 m altitude
Summit height	3300 m	4000 m
Armament	a 45 cm torpedo m / 17

literature

• Volker Koos: Ernst Heinkel Flugzeugwerke 1922–1932 . Heel, Königswinter 2006, ISBN 3-89880-502-6 , p. 44/45 .
• Volker Koos: Aviation between the Baltic Sea and Breitling . Warnemünde sea and land airfield 1914–1945. Transpress, Berlin 1990, ISBN 3-344-00480-8 .
• Helmut Stützer: The German military aircraft 1919–1934 . E. S. Mittler & Sohn, Herford 1984, ISBN 3-8132-0184-8 , p. 197 .