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Gotha WD.10

Страна: Германия

Год: 1916

Gotha - G.IV - 1916 - Германия<– –>Gotha - WD.4 / U.W.D. - 1916 - Германия


O.Thetford, P.Gray German Aircraft of the First World War (Putnam)


Ursinus Seaplane
  Another most interesting design of Ursinus was his seaplane fighter of 1916, with retractable floats designed to lie flat against the lower part of the fuselage when cranked up by the pilot. It was an attempt to overcome the inherent disadvantages of drag and manoeuvrability which attended float planes generally and fighters in particular. To improve manoeuvrability the engine was located on the centre of gravity and the airscrew driven through an extension shaft. The general cleanliness of the aeroplane, for the 1916 period, was remarkable. Unfortunately the prototype was destroyed during trials, and the estimated top speed of 200 km.hr. (124 m.p.h.) had not been achieved by that time. Engine, 150 h.p. Benz Bz III. Span, 9.00 m. (29 ft. 6 3/8 in.). Length, 7.77m. (25ft. 6 1/2 in.). Height, 2.9 m. (9 ft. 6 1/4 in.) floats down; 2.0 m. (6 ft. 6 3/4 in.) floats retracted. Weights: Empty, 749.5 kg. (1,649 lb.). Loaded, 1,002 kg. (2,205 lb.).

A.Imrie - German Naval Air Service /Arms & Armour/
Oskar Ursinus (Editor of Flugsport magazine) designed a single-seater to embrace several features intended to obtain the very best performance from the 150hp Benz six-cylinder engine. Built by Flugmaschinen Rex GmbH and allocated naval number 782, the aircraft is shown at Warnemunde during evaluation in April 1917. The most revolutionary feature of the design was its retractable float undercarriage. The pilot manually operated a small differential winch which reduced the lengths of the bracing cables on one diagonal of the undercarriage struts and lengthened corresponding cables on the other diagonal, allowing the floats to be cranked to the 'up' position. They were retracted forward against the airflow; this kept the centre of gravity forward and also assisted with float extension. In the event, the aircraft was never flown, since during initial taxiing trials at 900rpm the machine nosed over. After further investigation the design was abandoned.
H.Cowin - Aviation Pioneers /Osprey/
About the same time as the Junkers J.I was making its debut, the Gotha WD-10 was nearing completion, ready to enter flight trials early in 1916. While not representing such a fundamental advance as the J.I, this Oskar Ursinus creation merits more than passing interest for the novel and clever fashion in which the designer minimised the deleterious effects such things as floats would otherwise have on the fighter's overall performance. Thanks to its refined in-flight lines, brought about by the retractable floats, the WD-10, with its 150hp Benz Bz III had a top level speed of 124mph at sea level. At this speed, the German single seat naval fighter could outpace France's finest, in the shape of the Spad VII, first flown in April 1916. Perhaps it was fortunate for the Allies that the WD-10 was destroyed during flight test. The images not only show the aerodynamically cleansing affect of the retractable floats, but also the extremely neat housing of engine and fuselage flanking radiators devised by the Ursinus design team.
A.Imrie - German Naval Air Service /Arms & Armour/
Ursinus Seaplane - floats retracted