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Aviation History
1923
1923 - 0122.PDF
MARCH 1. 1923 THE UDET SPORTING TWO-SEATER • ~- 35 H.P. Haacke Engine IN our issue of July 13, 1922, we published illustrations and a description of the Udet sporting single-seater monoplane built by the Udet Aircraft Works of Munich. Since then, that firm has been experimenting with a development of the original experimental machine, and the result is that a two-seater, similar in general appearance to the first machine, has been developed to the point where the designers feel that they can standardise it for quantity production. This is now being done, and as the machine provides a very good example of what can be done with an engine of low power, we have thought that a brief reference to it may be of interest to readers of FLIGHT, more especially in view of the recent state that the maximum speed is about 150-155 km./hr. (93-96 m.p.h.). As the wing loading is about 9-5 lbs./sq. ft., the landing speed is probably high. No figures are supplied by the makers, but a rough estimate indicates that the minimum speed cannot be much less than 50 m.p.h. That in itself, is not a high figure for the ordinary aeroplane, but as a machine of this type is probably not intended to be used by experienced pilots only, a reduction in the landing speed of 10 m.p.h. or so would, we think, have done no harm. However, this is mainly a question of personal opinion, and if a good top speed is desired, a fairly high landing speed is unavoidable. LENGTH ... 5PAN AREA OP WIMG9 5 5m UDET .TWO-SEATER MONOPLANE 35 hP HAACKE ENGINE THE UDET TWO-SEATER : General arrangement drawings, to scale. production by the Bristol Aeroplane Co. of the 18 h.p. " Cherub " engine described and illustrated in this issue. From the accompanying scale drawings it will be seen that the Udet monoplane, in spite of the fact that it has a cantilever wing, is of high aspect ratio. This, coupled with the clean lines of the machine, is no doubt mainly responsible for the general efficiency, and although personally we are of the opinion that the wing loading is too high for a machine of this type, there is no doubt that the top speed is uncom- monly good for such a low-power engine. The makers Constructionally, the Udet two-seater is similar to the single-seater, i.e., the fuselage is a flat-sided plywood-covered structure, while the wings are built up on two box spars having spruce flanges and three-ply sides. The choice of low wing position has doubtless been made mainly on account of a desire to keep the wing in one piece. With the wing placed above the fuselage this would have been difficult, as the placing of the cockpits would interfere with the attach- ment of the rear spar. Aerodynamically, this wing position is generally thought to be slightly inferior to the parasol THE UDET TWO-SEATER : Three views of the machine on the ground, and one showing it in flight. • 122
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