Heinkel HD 22

Heinkel HD 22
Hungarian HD 22 (1933)
Type:	Training and reconnaissance aircraft
Design country:	German Empire
Manufacturer:	Heinkel Weiss Regju
First flight:	1926
Commissioning:	1928
Production time:	1926-1932 1934/35
Number of pieces:	51

The Heinkel HD 22 was a German training and reconnaissance aircraft from the 1920s. The abbreviation HD stands for Heinkel Doppeldecker .

history

Hungarian HD 22 (1933)

The HD 22 was built in 1926 on behalf of the Reichswehr . In the same year the first prototype (registration number D – 1096 ) was flown in and then handed over to the German Aviation School (DVS), where it flew as D – IQIL . In 1927 two more copies were made, one of which also went to DVS. The other was flown over to Hungary on March 17, where it served as a model aircraft in the negotiations carried out at the same time about license production, which Heinkel was conducting with the Budapest-based Manfred Weiss Stahl- und Metallwerke ( Hungarian Weiss Manfréd Acél-és Fémművek ). The agreement was successfully concluded on September 14, 1927, and a month later the construction documents and drawings were handed over to the Hungarian licensee on October 15. In 1928, Weiss-Werke began producing a total of 40 HD 22s, which were phased out in 1932. The first license sample was completed on May 8, 1928. Three more copies followed in 1934/1935, which were built by Regjü in Sóstó. The Hungarian HD 22 were also used as trainers, which is why some of them were equipped with a machine gun. They were initially equipped with Hieronymus and Austro-Daimler engines, but later all of them were exchanged for Titan II radial engines . The last HD 22 was flown in 1946 as a glider tow plane with the registration number HA-BOS .

In addition to the three prototypes built, five other aircraft were built in Germany, most of which were used by the Reichswehr for secret tests. Only one were from the US major Geo. E. A. Reinburg, at the time aviation attaché in Berlin, acquired and used as a touring aircraft with the registration number AC 4711 . Later she received the German approval as D-IAHA .

With the first HD 22, the flight recordings for the UFA film FP1 answers not over Warnemünde and Greifswalder Oie were shot in 1932 . Robert Förster from DVS in Warnemünde acted as the pilot double for the main actor Hans Albers .

construction

The HD 22 is a one -and- a -half-decker in mixed construction .

Fuselage : The fuselage has a square cross-section, strongly arched at the top, and consists of a tubular steel frame with four longitudinal spars , which is planked with aluminum in the engine area and on the back and covered with fabric in the rest of the area. The bottom is flat, the sides slightly curved and the end is designed as a vertical cutting edge. Behind the fire bulkhead there is a luggage compartment, followed by the two separate cabins equipped with double steering. The engine mount is removable and connected to the fuselage frame with four bolts.

Structure : Both the upper and lower wings are designed in two parts and have two box spars. They consist of a wooden frame with a plywood-clad wing nose and fabric covering in the rest of the area. On the underside there is also a panel made of plywood between the bars. The wings are strongly staggered to one another and connected to each other by N-stems and to the fuselage by I-stems. The V position is 1 ° at the top and 2 ° at the bottom. Only the continuous upper wing has ailerons . It also houses the fuel tanks with a capacity of 400 liters.

Tail unit : All fins and rudders consist of a tubular steel frame with fabric covering. The elevator and rudder units are aerodynamically balanced and braced with one another, the former is braced towards the fuselage. The horizontal stabilizer is adjustable in flight.

Chassis : The HD 22 is equipped with a rigid two-wheeled chassis with a large track width with a continuous axle and Vickers- Oleo oil pressure suspension in the front struts. The rear struts are crossed out with profile cables. There is a spring-loaded grinding spur at the rear.

Technical specifications

Three-sided view

Parameter	HD 22 with BMW IV	HD 22 with BMW Va	HD 22 with Ju L 5	HD 22 with Gnôme-Rhône Titan II
First flight	1926
crew	2
span	above 12.0 m, below 10.4 m
length	8.3 m	8.44 m		7.8 m
height	3.78 m
Wing area	34.80 m²			k. A.
Preparation mass	1050 kg	1110 kg	1250 kg	793 kg
payload	500 kg	k. A.	500 kg	478 kg
Takeoff mass	1550 kg	1610 kg	1750 kg	1270 kg
drive	a BMW IV	a BMW Va	a Ju L 5	a Gnôme-Rhône Titan II
power	240 hp (177 kW)	320 hp (235 kW)	280 PS (206 kW)	240 hp (177 kW)
Top speed	190 km / h near the ground	220 km / h near the ground	195 km / h near the ground	201 km / h
Cruising speed	165 km / h	k. A.	k. A.	k. A.
Landing speed	78 km / h	80 km / h	85 km / h	k. A.
Rise time	3:42 min at 1000 m altitude 8:06 min at 2000 m 13:24 min at 3000 m 20:48 min at 4000 m	3:18 min at 1000 m altitude	3:30 min at 1000 m altitude	n / a
Range	950 km	k. A.	720 km	k. A.
Service ceiling	5300 m	5800 m	5000 m	4500 m

literature

• Volker Koos: Ernst Heinkel Flugzeugwerke 1922–1932 . Heel, Königswinter 2006, ISBN 3-89880-502-6 , p. 57-59 .
• Helmut Stützer: The German military aircraft 1919–1934 . E. S. Mittler & Sohn, Herford 1984, ISBN 3-8132-0184-8 , p. 138 .

Web links

Commons : Heinkel HD 22  - Collection of images, videos and audio files

Individual evidence

1. ↑ Volker Koos: Aviation between the Baltic Sea and Breitling . Transpress, Berlin 1990, ISBN 3-344-00480-8 , pp. 84 .
2. ↑ ^{a b c} Helmut Stützer: The German military aircraft 1919–1934 . E. S. Mittler & Sohn, Herford 1984, ISBN 3-8132-0184-8 , p. 186 .