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Göppingen Gö 9

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Top speed
  
220 km/h

Length
  
6.8 m

Designer
  
Ulrich Hütter

Wingspan
  
7.2 m

Manufacturer
  
Göppingen Gö 9 Gppingen G 9 Luft 3946 entry

G ppingen g 9


The Göppingen Gö 9 was a German research aircraft built to investigate the practicalities of powering a plane using a pusher propeller located far from the engine and turned by a long driveshaft.

Contents

Göppingen Gö 9 Gppingen G 9 Luft 3946 entry

Design and development

In 1937, Claudius Dornier observed that adding extra engines and propellers to an aircraft in an attempt to increase speed would also attract a penalty of greater drag, especially when placing two or more engines within nacelles mounted on the wings. He reasoned that this penalty could be minimized by mounting a second propeller at the rear of an aircraft. In order to prevent tail-heaviness, however, the engine would need to be mounted far ahead of it. Dornier patented this idea and commissioned a test plane to evaluate it.

Göppingen Gö 9 Gppingen G 9 Luft 3946 entry

The aircraft was designed by Dr Ulrich Hütter as a 40% sized, scaled-down version of the Dornier Do 17's fuselage and wing panels without the twin-engine nacelles, and built by Schempp-Hirth. The airframe was entirely of wood and used a retractable tricycle landing gear – one of the earliest German airframe designs to use such an arrangement. Power was supplied by a Hirth HM 60 inverted, air-cooled inline four-cylinder engine mounted within the fuselage near the wings. Other than the engine installation, the only other unusual feature of the aircraft was its all-new, full four-surface cruciform tail, which included a large ventral fin/rudder unit of equal area to the dorsal surface. This fin incorporated a small supplementary tailwheel protruding from the ventral fin's lower tip that assisted in keeping the rear-mounted, four-blade propeller away from the ground during take-off and landing. The Gö 9 carried the civil registration D-EBYW.

Göppingen Gö 9 Gppingen G 9 Prototype aircraft for Do 335

Initially towed aloft, flight tests began in June 1941, but later flights operated under its own power. The design validated Dornier's ideas, and he went ahead with his original plan to build a high-performance aircraft with propellers at the front and rear, producing the Dornier Do 335. The eventual fate of the Gö 9 is not known.

Specifications (Gö 9)

Data from Die Deutsche Luftruestung 1933-1945 Vol.1 - AEG-Dornier

General characteristics

Göppingen Gö 9 httpsuploadwikimediaorgwikipediacommonsthu

  • Crew: 1
  • Length: 6.80 m (22 ft 4 in)
  • Wingspan: 7.20 m (23 ft 7 in)
  • Gross weight: 720 kg (1,587 lb)
  • Powerplant: 1 × Hirth HM 60 4-cyl. inverted air-cooled in-line piston engine, 60 kW (80 hp)
  • Propellers: 4-bladed pusher propeller turned via an extension shaft
  • Performance

  • Maximum speed: 220 km/h (137 mph; 119 kn)

  • Göppingen Gö 9 Gppingen G 9 YouTube

    References

    Göppingen Gö 9 Wikipedia


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