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182 AIRCRAFT ENGINEERING July 1932 Th e Italian Caproni 90 P.B . Bomber with Six Isotta-Fraschini Engines Described By Professor R. Giacomelli ALTHOUG H built in 1929, th e Caproni 90 P.B. bombin g machine still remains the largest landplan e in the world, and holds all the world's records for load carrying, the maximum useful load carried being 15,000 kg. (approximately 15 tons). Powered by six Isotta-Fraschini Asso engines of 1,000 h.p. each, it is of the familiar Italian type with a large bottom and comparatively small top plane connected by two pairs of struts on each side, the outer of which are inclined, with a mono plane tail. The bottom plane is in three portions, wit h a centre section carrying the undercarriage an d four wing engines, th e other two engines being mounte d on the centre line on a gantry above th e fuselage. A swivelling wheel is provided under th e tail. Stee l Tubin g Throughout The whole machine is constructed in steel tubing. Th e main planes are built up round two main t o the bottom fuselage longerons, the vertical legs spars . These are of massive construction on box- being attached to the front and rear spars of the girder lines with steel tubes at the corners inter- centr e section of the bottom wing. In both these braced by inclined steel tubes in the horizontal legs arc incorporated oleo-pneumatic shock-ab an d vertical planes. These spars arc connected, sorbers with two sots of rubber shock-absorbers as can be seen in one of the illustrations, by a in compression. All four legs are of steel tubing. somewha t complicated structure of steel tubing. A pair of wheels is carried on each unit, one on Th e ribs are constructed of rolled duralumin each side of th e vertical vee with an axle connecting channel-section, top and bottom members con th e two. The wheels have a diameter of 2 metres nected by vertical tubular steel struts with wire (6 ft. 7 in.), and have been tested to take a load bracing. Sheet-steel pressings arc used to provide of 7,000 kg. (15,4301b.). built-up joints a t the wing-roots of th e lower plane wit h extensions screwing into a fitting at the Th e tail surfaces are constructed of steel tube, extremitie s of the centre section. This fitting also fabric covered, all control portions being balanced. carries the joints for the under-carriage legs and Righ t in the nose of the fuselage is a gunner's engine bearers. cockpit with a very wide field of lire. The pilot's The interplane struts are formed of built-up PRINCIPA L CHARACTERISTICS cockpit, which has two seats side by side with dual members with four vertical steel tubes with tubular control, is immediately in front of th e centre section. Spa n (top plane ) .. .. .. .. 34∙9 in. (115 ft.) steel bracing, the whole covered by a thin sheet Spa n (bottom plane) .. .. .. .. 46∙58 m . (153 ft.) Behind the wing is a second gunner's cockpit fairing. Balanced ailerons are fitted on th e bottom Lengt h overall .. .. .. .. 26∙94 m . (88 ft.) wit h a third in th e centre section of the top plane. plane only. Heigh t overall .. .. .. .. 10∙8 m . (35 ft.) Are a of main planes .. .. 496∙7 sq. in. (5,370 sq . ft.) Th e engines, each pair of which is mounted in Th e fuselage is of the usual type comprising Area of ailerons .. .. .. 22 sq . m . (237 sq . ft.) tande m in a nacelle, are of the 18-cylinder watf.r- four tubular steel longerons with steel-tube struts Are a of stabilise .. .. .. 10∙2 sq . m . (110 sq . ft.) cooled arrow type with three rows of six cylinders. and wire bracing. It is suspended below th e bottom Are a of elevator .. .. .. .. 5 sq . in . {53 sq . ft.) Weigh t empt y .. .. .. .. .. 15 tons Th e bore is 150 mm. (6 in.) and th e stroke 180 mm. plane, th e centre section of which is built integrally Useful load .. .. .. .. .. 15 tons (7 in.). The normal output is 900 h.p. at 1,450 wit h the top of the fuselage. It is covered in Weigh t loaded .. .. .. .. .. 30 tons r.p.m., with a maximum of 1,100 h.p. at 1,750. fabric except in the centre, where a covering of Wing loading .. .. 60∙5 kg./sq. m . (12∙4 lb./sq . ft.) r.p.m . The two-bladed airscrews are driven direct. Power loading .. .. 5∙5 kg./h.p . (12∙127 lb./h.p. ) duralumi n sheet is provided. Maximu m speed .. .. .. 205 k.p.h . (127 m.p.h. ) "P.B. " stands for "Pesante Bombardamento" Eac h undercarriage unit consists of a horizontal Landin g speed .. .. .. 90 k.p.h . (56 m.p.h. ) (Heav y Bomber). and vertical vee. The legs of the former are taken Ceiling .. .. .. .. 4,500 m . (14,760ft.)
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Jul 1, 1932
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