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Aviation History
1934
1934 - 0444.PDF
FLIGHT, MAY 3, 1934 FOREIGN AIRCRAFT A POLISH FIGHTER THE P.Z.L P.24 The P.Z.L. P.24, with a Gndme-Rhone 770-h.p. engine, has a top speed of 242 m.p.h. C* OR the past three or four years' the Panstwowe Zaklady Lot- nicze (the Polish National AircraftEstablishment) has been produc- ing high-wing monoplane single-seater fighters with " gull " type wings. The better-known typesare the P-I (Hispano Suiza), P-VIII (Lorraine " Petrel "), andthe P-XI (Bristol " Mercury "or Gnome-Rh6ne K.9). One interesting feature of the P.Z.L,series is that the machines fitted with water-cooled engines have a fuselage of rectangular section and for those withair-cooled engines the fuselage is of oval section. In this way minimum drag has been obtained for both types. Thewings, on the other hand, are alike for machines in both groups. GulUike Wings The " gull " type wings each have two tapered duralu-min spars of double " T " section. Compression struts and ribs are also of duralumin. The portion of duralumin•corrugated sheet covering between the spars is rigidly fixed to the ribs and is stressed, thus increasing the strengthof the wing. The maximum chord of the wings occurs at about 2/5ths of the distance from the roots to the tips.A cut-out of the trailing edge towards the centre line of the wings, together with the thinning down of the wings•some distance from their roots, provides exceptionally good visibility for the pilot. Each wing is braced by a pair ofstruts without wire cross bracing. Frise ailerons of high aspect ratio are fitted over about half of the span. Theseailerons can be lowered simultaneously, when they serve as flaps for decreasing the landing speed. The P.Z.L. P.24 high-wing monoplane (770-h.p. Gnome-Rhone engine). Fuselage Duralumin struts of built-up sections are used for the forward portion of the fuselage, which carries two droppable riveted duralumin fuel tanks. Monocoque type construction with duralumin covering is used for the rear portion of the fuselage. Tail plane, fin, elevator and rudder are all of similar construction and are composed of tubes of C and L section. The engine mounting is a rigid cone of duralumin tubes and plates and is fixed at three points on the front portion of the fuselage. An undercarriage of the patented P.Z.L. type is fitted. This is built up of high-tensile steel tubes and has P.Z.L. oleo pneumatic shock absorbers. The Dunlop intermediate pressure wheels, using Dunlop pneumatic brakes, are fitted with spats. The power plant is a Gnome-Rhone 14 KSd 14-cylinder supercharged radial engine developing 770 h.p. at 13,120 ft. (4 000 m) at 2,100 r.p.m. A N.A.C.A. type cowling, the shape of which has been the subject of careful study, encloses the engine. Armament consists of two Vickers Class. E machine guns with 600 rounds of ammunition each. These guns use a P.Z.L. type mechanical synchronising gear. A short-wave receiving set, a transmitter of the standard Polish Air Force type and a signal pistol with 12 cartridges are carried. Specification P.Z.L. P.24 Span Length HeightWeight, empty Fuel .. 70 galls. 315 litresOil.. .. 44 pts. 25 litres. . Pilot with parachuteArmament _ .. Wireless equipment Electrical equipment Oxygen equipmentWing loading Power loading Performc Climb to 3,280 ft. (1 000 m) . . ,. 6,560 it. (2 009 m) ..„ .. Speed < , 9,840 ft. (3 000m) •.. , 13,120 ft. (4 000 m) .., 16,404 ft. (5 000 m) .. it ground level .. , 3,280 ft. (1 000 m) .., 6,560 ft. (2 0o0 m) .. , 9.840 ft. (3 000 m) .., 13,120 ft. (4 000 m) .. , 16,404 tt. (5 000 m) . -Range at cruising speed 34 ft. 8 in. (10,59 m). 24 ft. 3 in. (7,4 m). 9 ft. (2,75 m).. 2,782 1b. 8 oz. (1 202 kg). 507 lb. (230 kg).48 lb. 8 oz. (22 kg). 134 lb. (SS kg).132 1b. 3oz. (HO kg). 55 lb. 1 oz. (25 kg). 55 lb. 1 oz. (25 kg). 15 lb. 6oz. (7 kg).19 1b./sq. ft. (93 kg/mi) 4-8 1b./h.p. (2,18 kgih.p.). ince > 1 min. 50 sec. 2 min. 30 sec.3 min. 50 sec. 4 min. 50 sec.6 min. 15 sec. . 198-9 m.p.h. (320 km'hr). . 208-2 m.p.h. (335 kmjhr).. 217-5 m.p.h. (350 km/kr). . 229-9 m.p.h. (370kmlhr).. 242-4 m.p.h. (390 km!hr). . 233 m.p.h. (375 km,'hr).. 373 miles (600 km). THE MAILLET-NENING MONOPLANE A fast French three-seater (CONSTRUCTED by M. Maillet and M. Nening, chief ^ pilot and chief engineer respectively of the Roland Garros Aero Club, this recently completed aircraft, known as the M.N., possesses, as the result of very clean aero- dynamic design and the installation of a modern type of 444
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