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Aviation History
1935
1935 - 0868.PDF
4i8 FLIGHT. APRIL 18, 1935. The unusual tail arrangement of the H.P.47 is well shown in these photographs. As the fin and rudder are ahead of the horizontal tail surfaces they are not " blanketed '' at large angles of incidence. The picture on the right gives a good idea of the view and field of fire obtained by the rear gunner. (Flight photographs.) yawing moments are not set up, but in the H.P.47 yet another powerful control is provided by the peculiar arrange ment of the tail surfaces, keference to our photographs wril show that instead of being placed above the tail the fin and rudder are placed ahead of the tail plane. The advantage of this arrangement is that at large angles of incidence the rudder is not " blanketed "-by the tail, and thus re tains its effectiveness. Another feature of the design which probably helps materially in retaining rudder effectiveness is the narrowing-in of the fuselage cross-section aft of the gunner's cockpit. This has a military as well as an aero dynamic advantage in that the rear gunner's view and field of fire in a downward and rearward direction are greatly improved. Almost the only modern aid to aerodynamic efficiency which is not incorporated in the H.P.47 is a retractable undercarriage. With petrol tanks in the wings, and with bomb racks under the wings, it would be a somewhat diffi cult matter to provide space in the interior of the wing for the wheels.' Instead, each wheel is carried on a tripod con sisting of the telescopic leg, the radius rod and the lateral bracing strut. The latter, incidentally, runs outward from the wheel instead of inward. This is, of course, done to leave the centre of the wing unobstructed for the dropping of the bombs. Each wheel is almost totally enclosed in a fairing to reduce drag. A castering tail wheel is fitted, so that, with the differentially operated wheel brakes, the machine is very manoeuvrable on the ground. Of the military aspects of the H.P.47 it is possible to say but very little. The relatively small fuselage gives little indication, from an external inspection, of the extent of the equipment carried. The structure is such that the whole space inside is available, and one result is that no room is wasted and that the crew are not hampered in their movements. The pilot, as in all single-engined military aircraft, is placed just aft of the engine. In the 47 this is a Bristol " Pegasus " enclosed in a cowling ring. The view from the front cockpit is good, and the fact that the wing is heavily tapered reduces the blind area diagonally downwards. The fuselage deck drops away at the back so that the rear gunner is well protected against draught, while at the same time he obtains a good view and a free field of fire for his machine gun. Altogether, the H.P.47 is a very interesting aeroplane, and it will afford valuable information concerning the use of full-span slots, slotted flaps, and interceptors on a high- performance machine. The experience thus gained should be applicable to many other types. Powerful lateral contro is obtaineo by fitting " interceptors " behind the wing-tip slots. The interceptor is here shown in the " up " position. (Flight photograph.) A "Pou-dwCiel" Journal An interesting indication of the way in which the Pou-du- Ciel has captured the imagination in France is provided by the recent establishment of a new journal, •" Envoi," which is the official organ of the French National Association of Air Amateurs, of which M. Henri Mignet is president. We have received the first two issues of " Envoi." The publication appears twice a month, and costs two francs. Anyone in terested is advised to write to the Editor of "Envoi," at 22, Rue Cognacq-fay, Paris 7e. The journal deals extensively with items of interest to builders and users of the Pou-du-Cwi, but also with light plane flying generally and gliding. To Promote Scientific Management The sixth International Congress for Scientific Management will be held in London from July 15-20, and an invitation has been extended to all those interested in any phase of manage ment, whether agricultural, commercial, domestic or industrial H.R.H. the Prince of Wales is the patron of the Congress and will open the proceedings, and the Government will invite members to a reception. Papers have been promised by eminent managers from several countries, and delegations from many parts of the world will be present. The Congress will provide opportunities for informal meetings between member and people from other countries interested in the same problems as themselves Enquiries should be addressed to the Secretary of the Congress, Mr. H. Ward, M.Sc., S.I-C. at 21. TothiJl Street. S W.i.
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