Kress Drachenflieger

Source: Wikipedia, the free encyclopedia.
Drachenflieger
Role Experimental aircraft
National origin Austria-Hungary
Manufacturer Wilhelm Kress
Designer Wilhelm Kress
Number built 1

The Kress Drachenflieger (German: "Dragon-flier") was an experimental aircraft constructed in Austria-Hungary in 1901. While taxiing trials proved successful, the aircraft lacked sufficient power to fly, and was wrecked in the course of testing on 3 October.

It was built by

screw-type two-bladed propellers, the first attempt to use an internal combustion engine to power a heavier-than-air aircraft.[1][4] The fabric-covered propellers were mounted pusher-fashion on pylons above and on either side of the main truss, between the second and third sets of wings, and were designed to counter-rotate
.

The engine would prove to be the aircraft's downfall. Kress had originally intended to have an engine specially built, calculating that he needed 37 kW from an engine weighing not more than 220 kg (475 lb).[5] When the cost of this proved prohibitive, he purchased an automobile engine already in production which had an output of just 22 kW (30 hp) but weighing nearly twice as much as Kress' calculations allowed for.[5] Initial trials on water as early as March 1901 confirmed that the poorer power-to-weight ratio would be a problem.[3] Nevertheless, other elements of the design proved sound, and the Drachenflieger was successfully controlled while taxiing, even against a headwind.[3]

Unable to afford to replace the engine, Kress continued taxiing trials. The last of these was on 3 October[6] on the Wienerwaldsee reservoir at Tullnerbach, in which he was forced to swerve suddenly to avoid a groyne.[5] As a result of the violent maneuver, the supports for one of the pontoons failed,[4] causing the Drachenflieger to capsize and sink.

Specifications

General characteristics

  • Crew: One pilot
  • Gross weight: 850 kg (1,870 lb) [4]
  • Powerplant: 1 × Daimler automotive engine , 22 kW (30 hp)

Notes

  1. ^ a b Gregorat 2007
  2. ^ The three sets of wings lead to the aircraft being described as a triplane in some sources, such as Taylor(1989, 563)
  3. ^ a b c d Scientific American 137
  4. ^ a b c Nicolaou 1998, 10
  5. ^ a b c Gunston 1992. 31
  6. ^ Gunston gives 15 October

References

Wikimedia Commons has media related to Kress Drachenflieger.
  • Gregorat, Giovanni (May 2007). "The Emperor's Flying Machine". Metal Finishing News. 8. Retrieved 2008-09-13.
  • Nicolaou, Stephane (1998). Flying Boats & Seaplanes: A History from 1905. Osceola: Zenith.
  • Gunston, Bill (1992). Chronicle of Aviation. London: Chronicle Communications.
  • "The Kress Aeroplane". Scientific American (84). 2 March 1901.
  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions.
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