Heinkel HD 32

Heinkel HD 32
HD 32 ( D–678, Wnr. 230) with Lucifer engine
Type:	Trainer aircraft
Design country:	German Empire
Manufacturer:	Heinkel Arado
First flight:	1925
Commissioning:	1925
Production time:	1925
Number of pieces:	11

The Heinkel HD 32 was a German trainer aircraft produced by the Ernst Heinkel Flugzeugwerke . The abbreviation HD stands for "Heinkel Doppeldecker".

development

The HD 32 was created in 1925 as a further development of the HD 21 training aircraft and its successor, the HD 29 . The structure was largely identical, but it was visually distinguishable through the use of a star instead of an in- line engine , the reduction in the number of cabins from three to two and modified canopy struts . The Allied Aviation Guarantee Committee , which was responsible for compliance with the restrictions imposed on aircraft construction in Germany after the First World War, together with the HD 29, confirmed the civilian design of the aircraft on May 28, 1925. At Heinkel in Warnemünde, seven HD 32s with serial numbers 228–234 were built in the same year. Since the Reichswehr put the need for training aircraft for a planned armaments program at a total of 165 HD 21 and HD 32 in December 1925, a license production at Arado Flugzeugwerke GmbH, also based in Warnemünde, was considered and there were four more with the serial numbers 16– 19 produced. Most of the aircraft were taken over by Sportflug GmbH , whose flying schools were officially civil in character, but were secretly used to train future military pilots. This they gave some time to the German Pilot School and the German Research Institute for Aviation from. One HD 32 each went into the possession of the Academic Aviation Groups Aachen , Berlin , Darmstadt and Stuttgart. Three HD 32s - equipped with the different Sh 11 , Sh 12 and Lucifer engines - took part in the German sightseeing flight of 1925 together with several HD 21s .

A public presentation of the three types HD 21, HD 29 and HD 32 took place together with the HD 35 on December 16, 1925 at the Berlin-Tempelhof airfield . In addition to the press, domestic and foreign representatives of state authorities were invited, and the pilots who were present were given the opportunity to test the models on site in flight. Ultimately, however, a larger series production did not materialize, so that the eleven copies built remained.

construction

The HD 32 is a single-legged, braced and heavily staggered double-decker in a wooden construction with a tail landing gear .

Fuselage: The fuselage consists of plywood frames crossed out with steel wires and four longitudinal spars clad with plywood, which form a square cross-section with a curvature on the upper side and end in a vertical tail edge. Behind the engine, the paneling up to the fire bulkhead in front of the first cabin is made of aluminum sheet. The aircraft is equipped with two cabins and has a double control, which can be easily expanded in the student pilot's cabin.

Structure : The wings are in two parts and consist of a wooden frame with two box spars and plywood ribs. The lower wing has a slight V-position of 2 ° while the upper wing is straight. The undersides are planked with plywood between the individual stiles, the rest of the area is covered with fabric. The wing nose is also made of plywood. The wings are connected to one another with N-struts and braced, with the upper wing being staggered forward. The canopy connection consists of I-posts. Only the upper wing has ailerons; It also houses the fuel tanks with a volume of 140 liters.

Tail unit: The tail unit has a normal design, the vertical fin is made of a wooden frame with plywood planking and the horizontal fin is made of a tubular steel frame with fabric covering. The elevator is aerodynamically balanced and supported on the fuselage with two struts. All oars are made of tubular steel covered with fabric.

Landing gear: The HD 32 has a rigid main landing gear with a continuous axle and rubber rope suspension . There is a grinding spur at the rear .

Technical specifications

Parameter	Dates (with Sh 12)
crew	2
span	above 10.5 m below 9.0 m
length	6.8 m with Siemens engine 6.9 m with Bristol engine
height	3.02 m
Wing area	24.3 m²
Preparation mass	520 kg
payload	100 kg
Payload	380 kg
Takeoff mass	900 kg
drive	an air-cooled nine-cylinder radial engine
Type	Siemens & Halske Sh 12
Starting power	125 PS (92 kW)
Continuous output	108 hp (79 kW)
fuel	140 l
Top speed	140 km / h near the ground
Cruising speed	130 km / h
Landing speed	70 km / h
Rate of climb	2.2 m / s
Rise time	7 min, 30 s at an altitude of 1000 m
Range	600 km
Flight duration	4.5 h
Service ceiling	3800 m

literature

• Volker Koos: Ernst Heinkel Flugzeugwerke 1922–1932 . Heel, Königswinter 2006, ISBN 3-89880-502-6 , p. 80-81 .
• Volker Koos: Aviation between the Baltic Sea and Breitling . Warnemünde sea and land airfield 1914–1945. Transpress, Berlin 1990, ISBN 3-344-00480-8 , pp. 59 ff .
• Helmut Stützer: The German military aircraft 1919–1934 . E. S. Mittler & Sohn, Herford 1984, ISBN 3-8132-0184-8 , p. 36, 141-142 and 183 .

Web links

Commons : Heinkel HD 32  - collection of pictures, videos and audio files