Heinkel HD 36

Heinkel HD 36
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Type:	Trainer aircraft
Design country:	German Empire
Manufacturer:	Heinkel , CFM
First flight:	1927
Commissioning:	1928
Production time:	1928-1930
Number of pieces:	21st

The Heinkel HD 36 is a training aircraft produced by Ernst Heinkel Flugzeugwerke in Warnemünde at the end of the 1920s .

development

The HD 36 was developed for the Swedish Air Force , which had acquired a copy of the three-seater HD 35 in 1926 and, based on the experience gained at Heinkel in Warnemünde, commissioned a successor with a more powerful engine for beginner training, reduced to two crew members. Possibly existing plans were used during the development, because in September 1925 the Interallied Aviation Guarantee Committee had already granted approval for a civil mail plane HD 36 with a 180 HP Lynx engine. The prototype with the serial number 273 was completed in 1927 and tested in the summer of that year. On 26./27. July was taken over by the Swedish side. Before that, however, a series of factory photos was taken of the aircraft, for which it was given the fictitious registration number D-HD36 , because an official registration in Germany was not carried out.

The tests subsequently carried out with the model aircraft in Sweden were satisfactory and it was decided to build the model under license. The necessary rights for this were acquired through Svenska Aero , production took place at Centrala Flygverkstaden Malmslätt (CFM, Central Aircraft Workshop Malmslätt). A first serial order for ten as Sk 6 (Sk for Skolflygplan, training aircraft) was issued on March 9, 1928; the first of which first flew in December of that year. On September 17, 1929, the Air Force ordered a further ten Sk 6s, which were delivered between March and October 1930. All aircraft were equipped with Mercedes D III engines, which had already been bought by Sweden in 1920. From 1932 to 1934, the 17 units that were still in existence, three of which had to be written off after crash landings, were modernized and given a more powerful Puma engine with 177 kW (241 hp), with which they were used for a few years as the Sk 6a for school purposes . The last five were not taken out of service until 1940.

construction

The HD 36 is a tense, einstieliger biplane in wood construction .

hull

The fuselage has a square cross-section with a curved back and runs out towards the stern in a vertical cutting edge. It consists of four longitudinal spars and wooden transverse frames with plywood planking. The engine area covered with aluminum sheets is separated from the rest of the fuselage by a fire bulkhead, behind which there is a storage space for luggage, to which the separate cabins for flight instructors and students are connected.

Structure

The HD 36 has a heavily staggered structure, with the upper and lower wings having a sweep of 2 ° and 3 ° and being connected to one another by N-posts. Both have two box spars, the spaces in between on the underside of the sash are covered with plywood push plates. The front edge is also made of plywood, while the rest of the wing is covered with fabric.

Tail unit

All rudders as well as the horizontal stabilizer, which can be adjusted and braced in flight, are formed from a tubular steel frame covered with fabric. The free-standing fin is made of wood with plywood planking. Ailerons are located in the upper and lower wings and are connected to each other by bumpers.

landing gear

The main landing gear is rubber-sprung with a freely swinging axle. There is a grinding spur at the rear.

Technical specifications

Parameter	Data
crew	1-2
span	above 11.0 m below 9.8 m
length	7.5 m
height	3.1 m
Wing area	30.75 m²
Preparation mass	940 kg
Payload	310 kg
Takeoff mass	1250 kg
drive	a liquid-cooled six - cylinder four-stroke in - line engine with a rigid two-bladed wooden propeller
Type	Mercedes D III
Take-off power Combat and climb power Rated power Continuous power	170 PS (125 kW) 160 PS (118 kW) on the ground 160 PS (118 kW) on the ground 140 PS (103 kW) on the ground
Top speed	130 km / h near the ground
Landing speed	70 km / h
Rise time	3.7 min at 1000 m
Service ceiling	5000 m

literature

• Volker Koos: Ernst Heinkel Flugzeugwerke 1922–1932 . Heel, Königswinter 2006, ISBN 3-89880-502-6 , p. 88/89 .

Individual evidence

1. ↑ Volker Koos: Aviation between the Baltic Sea and Breitling . Transpress, Berlin 1990, ISBN 3-344-00480-8 , pp. 87 .