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Aviation History
1934
1934 - 0922.PDF
924 FLIGHT. SEPTEMBER 6, 1934. THE INTERNATIONAL TOURING COMPETITION in the 1934 Contest. Slotted and flapped wings are almost universal • By FRITZ WITTEKIND T J TARSAW, August 30, 1934.— X/y Of the forty-eight aeroplanes * ' originally entered only thirty four have arrived in Warsaw. The problems with which designers were confronted this year were by no means easy. For a tare weight which must not exceed 560 kg. (1,233 lb.) they had to produce three- or four- seater cabin machines which, on the one hand, had to attain maximum speeds of 250 to 300 km j h (155-186 m.p.h.), and the landing speed of which, on the other hand, must not exceed 60 km jh (37 m.p.h.). A number of constructors have managed to do this, but undoubtedly it was difficult, and weighing of the The Fieseler Fi.-97 has a Fowler machines has shown that many have variable wing. exceeded the weight limit. The Ger- man machines particularly had to remove all sorts of things in order to get the weight down. It is obvious that this removal of things from the machines in order to get the weight down results in losing a number of points which will be awarded according to the so-called discretionary classification for equip- ment. It can be argued that too much weight has been placed upon these points for equipment in draw- ing-up the rules. The fact that a very wide speed- range is asked for has resulted in nearly all the competitors turning their attention to slotted wings. The variety of different ways in which the various constructors have attempted to solve the problem indicates that nothing like finality has yet been reached. In the new Breda 42 a new type of slotted-wing construction is employed, A POLISH DEFENDER : The RWD 9 has slotted flaps. On the Breda 42 the slots are automatic in action. in which the slats are operated auto- matically by the air-flow over them. Interesting also is the wing of the new Fieseler Fi-97. This is based upon the Fowler system, and provides variable area and variable camber. Quite a new system had been intro- duced by Herr Messerschmitt in the BFW-108. In this wing it was originally intended to have no ailerons at all, but at the last moment ailerons were adopted. Considerable improvements are to be found in the undercarriages. Only the Italian Bergamaschi PS-i and the German BFW-108 have retractile undercarriages. In the Italian ma- chine the wheels are withdrawn backwards, while in the German they are raised sideways and go into re- cesses in the underside of the wing. The fixed undercarriages show that the split type has become almost universal, with wheel brakes and bal- loon tyres.
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