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Aviation History
1935
1935 - 1009.PDF
MAY 2, 1935. FLIGHT. 477 An examination of the accompanying Flight photographs of the machine shows that the wing bracing of the Black burn G.P. is somewhat unusual. Instead of the orthodox vertical or nearly vertical interplane struts and streamline wire bracing, the wings of this machine are rigidly braced by sloping interplane struts, the lift of the lower wing being taken by one large strut which runs from lower front spar to upper rear spar The normal interplane struts are of " N " formation and provide the torsion or incidence brac ing. Frise-type ailerons are fitted on upper and lower wings, and the upper wing is provided with automatic wing tip slots. The tail surfaces are of orthodox design, but it wiH be observed that the elevators are provided with trailing-edge tabs. The fuselage has smooth metal skin covering and is of good aerodynamic shape, the form being streamline and the Armstrong Siddeley " Tiger " engine enclosed in a long- chord cowling ring. A "split" undercarriage is, of course, used to give space for the bombs and/or torpedo carried under the fuselage. The wheels are not enclosed in " spats," but it will be noted that where the three undercarriage struts meet the wheel a very large fairing is used in order to avoid interference drag. A castering tail wheel is used instead of a skid. Of the extensive military equipment carried little may be said, but it will be observed that provision is made for carrying offensive armament in the form of bombs and/or a torpedo, and that navigation lights are carried. The defen sive armament includes the usual synchronised machine guns for the pilot, mounted under the deck fairing, and a swivelling gun for the air gunner, who is protected against the slipstream by a flared-out cockpit coaming. j "-• ;r::pyr.parr •• "~i„ ... :.. -.v.'. •-•,-•- The Blackburn G.P. machine is almost a " sesquiplane " in that the lower wing is much smaller than the upper. Note the unusual wing bracing. In the view of the tail may be seen the "trimming tabs" on the trailing edge of the elevator. Another view of the wing bracing is obtainable in the side elevation below. Flight photographs.)
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