Dietrich DP II
| Dietrich DP II Buzzard | |
|---|---|
|
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| Type: | School and sport aircraft |
| Design country: | |
| Manufacturer: | |
| First flight: |
1923 |
| Number of pieces: |
1 × DP II |
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The Dietrich DP II is a German training and sports aircraft from the 1920s and the most successful, because it was built in large numbers, by the Dietrich-Gobiet Flugzeugwerk AG in Kassel-Bettenhausen, which existed from 1923 to 1926 .
development
The construction work for the Dietrich passenger biplane - hence the abbreviation DP - was carried out in 1922 by Richard Dietrich and Max Gerner at Richard Dietrich Flugzeugbau GmbH in Mannheim, which was founded in the same year for the civilian conversion of war aircraft . The company moved to Kassel in the spring of the following year and became Dietrich-Gobiet Flugzeugwerk Aktiengesellschaft in May 1923 through a registered partnership with Anatole Gobiet, who was the main shareholder . In addition to the assembly of the first Dietrich sample DP I Sperber , the parts of which were still made in Mannheim, the construction of the DP II was carried out. Dietrich himself carried out the first flight and the tests at the Kassel-Waldau airfield , whereby the Sh-4 engine used turned out to be too weak. In addition, there were doubts about the sufficient strength of the structure, which was constructed without wing handles and wire bracing . The D II therefore received struts and a stronger Sh 5 engine . So converted it was handed over as D II a Bussard to the DVL in Berlin-Adlershof , which, after appropriate tests, issued the type certification. It was then used in Kassel for pilot training.
Since the sample received good reviews, series production began in 1924, which also included the installation of or later conversion to Siemens Sh 11 , Sh 12 and Sh 14 motors . In order to boost sales, five of the aircraft built for the first time were used to carry out advertising flights over Berlin and northern Germany in the first half of the year. In addition, a D II a flown by Antonius Raab took part in the Königsberg Samland coastal flight and on May 18, 1924 won the aerobatics competition held in this context . In the aerobatic elimination at the end of May / beginning of June in Prague-Kbely , Raab was also able to take first place, which resulted in some positive feedback and construction contracts. With a street start on July 12, 1924, which he carried out directly in front of the Dietrich-Gobiet factory, Raab brought the D II a further public attention, which Kurt Katzenstein , who had meanwhile joined the company, increased even more when he did in October effective media coverage flew under the arch of the Kassel Fulda Bridge. During this time, Dietrich, Raab and Katzenstein took part as an aerobatic trio with the D II a in several flight events, which increased the popularity of aviation in the population many times over. In the five-country flight over 525 kilometers, the D II a took the first four places in its class on September 30, 1924. Further successes were the winning of the first two places in the overall ranking at the Großflugtag in Berlin-Staaken on April 12, 1925 by Rudolf Rienau and Victor Carganico and the victory in the Oberfrankenflug from May 2-3 in the relay and speed difference flight disciplines.
Despite these successes and good sales, Dietrich-Gobiet got increasingly into financial difficulties. The withdrawal of Anatole Gobiet from the company in 1925 due to differences of opinion with Richard Dietrich as well as the departure of Antonius Raab and Kurt Katzenstein with the accompanying founding of their own company , which also led to legal disputes, contributed to the fact that the plant, now renamed Dietrich-Flugzeugwerke AG , had to file for bankruptcy in November 1926. This also ended the production of the D II a.
construction
The DP II is a braced double-decker in composite construction . The fuselage consisted of a welded tubular steel frame with a rectangular cross-section , fabric covering and removable aluminum sheets in the engine area. It was equipped with two open, one behind the other cabins with double rudders. The wings were made of wood and covered with fabric. To reduce weight and optimize aerodynamics, the aircraft had no wire bracing or wing stems between the upper and lower wings, only two struts on each side ran from the upper wing to the lower fuselage. With the D II a, however, the outer wings were connected to each other by N-struts and one strut each ran from the upper wing to the engine suspension. The tail is like the structure of a fabric-covered wooden structure. The chassis was taken from the predecessor DP I Sperber ; it is rigid and consists of two disc wheels attached to struts that are connected to one another by an axle. There is a grinding spur at the rear.
Technical specifications
| Parameter | Data (DP II) | Data (DP II a) |
|---|---|---|
| crew | 1-2 | |
| span | above 7.20 m, below 6.60 m | above 7.20 m |
| length | 5.50 m | |
| height | 2.50 m | |
| Wing area | 16.32 m² | |
| Wing loading | 31 kg / m² | 38 kg / m² |
| Power load | 8.3 kg / hp | 7.8 kg / hp |
| Empty mass | 340 kg | 400 kg |
| Payload | 160 kg | 220 kg |
| Takeoff mass | 500 kg | 620 kg |
| drive | an air-cooled five-cylinder - radial engine Siemens & Halske Sh 4 |
an air-cooled seven-cylinder star engine Siemens & Halske Sh 5 |
| Starting power nominal power continuous power |
62 hp (46 kW) at 1600 rpm 58 hp (43 kW) at 1500 rpm 50 hp (37 kW) at 1350 rpm |
85 PS (63 kW) at 1600 rpm 80 PS (59 kW) at 1550 rpm 76 PS (56 kW) at 1500 rpm |
| Fuel volume | 60 kg | 70 kg |
| Top speed | 140 km / h near the ground | 160 km / h close to the ground |
| Rise time | 9 min at 1000 m altitude 19 min at 2000 m altitude |
6 min at 1000 m altitude 13 min at 2000 m altitude |
| Summit height | 2800 m | 3200 m |
| Radius of action | maximum 500 km | maximum 525 km |
| Flight duration | 4 h | 3 h |
literature
- Rolf Nagel, Thorsten Bauer: Kassel and the aviation industry since 1923 . Bernecker, Melsungen 2015, ISBN 978-3-87064-147-4 , pp. 2 ff .
Web links
Individual evidence
- ↑ Nagel / Bauer, p. 23 (Dietrich-Gobiet production list, verifiable marks and work numbers)