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Aviation History
1924
1924 - 0614.PDF
SEPTEMBER 25, 1924 SOME SHORT CONSTRUCTIONAL DETAILS : 1. The very neat engine mounting for the Bristol " Cherub." This mounting should be particularly good in respect of torsional stresses. 2. The oleo undercarriage. 3. Attachment of tail skid fixed end to fuselage. 4. The renewable shoe on the free end of the tail skid. 5. An aileron hinge. 6. The port wing root showing inspection doors giving access to wing attachments. The ailerons are operated by torque tubes. the particular form is as light as it might be for such a small machine is, perhaps, open to discussion, but that the system is well worth developing for larger machines there cannot be the slightest doubt. Even in this small size the weight of the fuselage is by no means prohibitive, although some of the machines entered have managed to reduce their fuselage weight below that of the Short. We have devoted rather a large amount of space to the fuselage, but we feel that we need not apologise for doing so, as the construction is unusually interesting. The monoplane wing of the competition machine is built over wood spars, but it appears likely that subsequent machines of this type will have spars made from high-tensile steel strip so as to make the entire construction metallic. In the Lympne machine the spars have flanges of laminated mahogany with walls of three-ply. The ribs are made of Duralmin, built up in the form of a Warren girder. The two wing halves are bolted to strong fuselage frames by fishplates and large-diameter hinge pins so as to facilitate dismantling. The ailerons extend the whole length of the wing, and are operated by torsion tubes and rods. A variable camber device is fitted, which allows of. depressing both ailerons together, the differential aileron action being retained. The undercarriage is of vee type, with rubber shock absorbers in the form of compression blocks incorporated in the front " legs." The axle as well as the telescopic struts-is enclosed in streamline casings, as shown in one of our sketches. The front chassis struts are bolted to a strong fitting immediately below the front spar attachment. The Bristol " Cherub " is mounted on a particularly neat aluminium alloy casting, shown in a sketch. Direct loads are taken by this mounting, assisted by sloping steel tube bracing struts as shown, while torque loads are taken care of by the casting itself. The whole forms a very simple mounting, making the engine readily accessible and allowing of removing the engine in a very short space of time. Behind the engine there is a fireproof bulkhead, aft of which are mounted the petrol and oil tanks. Direct gravity feed is employed. The photographs or p. 613, which were taken from above, give an excellent idea of the arrangement of the two cockpits in tandem. Owing to the fact that the front cockpit is ahead of the wing root, the view from here should be unrivalled, as the pilot can look straight down past the sides of the fuselage, and the only direction in which there is any obstruction is diagonally downwards and aft. Even from the rear cockpit the view is better than in the majority of machines, and altogether the question of view appears to have been most happily solved in the Short " Satellite." The controls are of usual type, and in conformity with the regulations they are in duplicate. This applies not only to the normal flying controls, but also the gear operating the variable camber device, which can be worked from either cockpit. The main dimension-s, weights, etc., are given in the general arrangement-dr-awing* and-in the table on p. 588. , 614
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