Göppingen Gö 9
| Göppingen Gö 9 | |
|---|---|
 Göppingen Gö 9 |
|
| Type: | Experimental airplane |
| Design country: | |
| Manufacturer: | |
| First flight: |
June 1940 |
| Commissioning: |
no |
| Number of pieces: |
1 |
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The Göppingen Gö 9 was an experimental aircraft that was built by Schempp-Hirth Flugzeugbau on behalf of the Dornier-Werke and went into flight tests in 1940.
prehistory
The Dornier company used pull and push propellers on engines in tandem to drive many flying boats . The advantages of this arrangement were the low frontal resistance, so that higher speeds and ranges could be achieved. If one engine failed, there were no asymmetrical effects, which was beneficial for the flight characteristics.
In 1937, Claude Dornier applied for a patent for a twin-engined fighter with tandem engines. What was new about the Reich patent number 728044 was that the two engines were separated by a pilot's cab and fuel tank. The rear motor was supposed to drive the pusher propeller attached to a cross tail with a long-distance shaft, which meant that the rear of the aircraft could be made leaner.
Test vehicle Gö 9
The Schempp-Hirth (SHK) company based in Kirchheim unter Teck was commissioned by Dornier to design and build a small, inexpensive test vehicle to demonstrate the operational reliability of a long-distance shaft. Since SHK was set to series production, the development company Wolf Hirth GmbH received the order for development and construction. The construction of the test vehicle designated as Gö 9 was entrusted to Ulrich Hütter . The model of the Dornier Do 17 on a scale of 1: 2.5 served as the basis for its construction . As in the patent, it had a cross tail and a nose wheel. The engine used was an air-cooled four - cylinder Hirth HM 60R in- line engine with an output of 80 hp (59 kW), which drove a wooden four-blade propeller. After a series of stationary runs, the aircraft was towed to altitude by a Do 17, after which it took off with its own drive. The pusher propeller showed its advantages, as the propeller jet flowed off undisturbed from the fuselage and wings to the rear and a flight speed of 220 km / h could be achieved with the 80 HP motor. At Dornier, the design of a high-speed bomber began, although there was still no official order from the RLM . It was not until 1942 that a high-speed bomber was advertised. The experience with the Gö 9 flowed into the design of the Do 335 .
Technical specifications
| Parameter | Data |
|---|---|
| crew | 1 |
| length | 6.80 m |
| span | 7.20 m |
| height | |
| Wing area | |
| Wing extension | |
| Empty mass | |
| Max. Takeoff mass | 720 kg |
| Top speed | 220 km / h |
| Engines | a Hirth HM60R in- line engine with 80 HP (59 kW) |
literature
- Heinz J. Nowarra : The German Air Armament 1933-1945. Volume 1. Bernard & Graefe, Koblenz 1993, ISBN 3-7637-5464-4 .
