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Aviation History
1929
1929 - 0520.PDF
FLIGHT, MARCH 14, 1929 For any member subject to both shear and bending to any considerable extent, it is advisable to work to shear figures given above. Polar Mass Moment of Inertia.—This is given to assist the aircraft designer in determining the effect of the engine mass on :— (a) The damping out of the engine torque fluctuation. b) The synchronisation with the engine impulses of the mounting natural period of torsional vibration. .Equivalent Static Torque.—The stress imposed by the The securing strap has a quick release, automatic lockingfastening enabling the cover to be quickly removed for rocker adjustments, etc. Cooling air is admitted by the cut away front portion andafter circulating round the rockers, passes out at the rear between the inlet pipe branches. Propellers The standard propeller hub supplied with the Bristol" Jupiter " is suitable for wooden propellers, but a Bristol- type hub suitable for detachable and adjustable metal blade HOLDING DOWN SCREW WITHAUTOMATIC LOCKING DEVICE. ANCHOR FULCRUM PINSUPPORTING BRACKET- FELT PAD i'rf 'iii / 1 \> i! CIRCULATING AIR INLET CIRCULATINGAIR OUTLET LOCATING DOWELS ANDSTEADY PLATFORM The "Jupiter" Rocker Helmet: This has been standardised to fit all three Series VI engines, as well as the Series VII, VIII, IX, and XI types. torque reaction is the most important factor to be considered in stressing engine mountings, being much greater than .that imposed by propeller pull or engine weight. The torque diagram of the Jupiter has nine equal-spaced peaks in each two revolutions, and therefore for stress calcula- .;tions, the mean or maximum torque does not give a true indication of the actual stress imposed ; for this purpose, the .equivalent static torque, which takes into account the effect , of torque fluctuation, is required. It should be noted that the effect on members in shear is twice that on members in tension. propellers can be supplied, the general arrangement being shown in one of our diagrams. A special hub, similar to the standard hub for wooden propellers, but without the radial serrations, and with a special ground finish to the driving flanges, is supplied for use with Reed-type metal propellers. These propellers, if used, must be of the latest pattern, with thick blades, and with the boss forged integral with the blades, or the blades fitted with metal packing blocks. The holes should be jig drilled and a good fit on the bolts. The use of the old type, built with wooden packing blocks in Diagram of " Jupi- ter "spinner, integral propeller boss type. LOCKINGNUT. SPINNER SHAPED TOSUIT PROPELLER NOSE PIECE MADEDETACHABLE TO PROVIDE ACCESS TOPROP HUB SECURING NUT-. CENTRING COLLAR-5ADJUSTED TO LIGHTLY BUTT AGAINST SPINNERNOSE ONE DOWEL FORDRIVING NOSE PIECE 1 SMANK RIVETED OVER \ WOOD^TIFFENERS 3 PLY FRONT AND,REAP SUPPORTS c 11 Rocker Cowling 1 he rocker cowling consists of a light aluminium pressing, arranged to cover completely the valves and rocker gear, and is intended to protect these components from foreign matter, and also to trap any surplus oil which may exude from the rocker lx.-arings, and prevent it being thrown back on the pilot's windscreen. One pattern is available suitable for all " Jupiter VI.A,"Jupiter VII," •• Juprter VIII," •• IX," and " XI " engines, .which are already drilled to receive the dowels used for locating the helmet, and fitted with the special extended-type iulcrum pin, to which the securing strap is attached. conjunction with thin section twisted blades, is not recom- mended for " Jupiter " engines. For the " Jupiter VI," and " VII," a two-bladed propelk". will be found most suitable, while for the geared engines either a two- or four-bladed propeller can be used. The design should ensure a reasonable slipstream velocity near the root, which should be of stiff section. The Propeller Department of the Bristol Company an prepared to design and supply suitable propellers for all type of Bristol engines. All propellers must be carefully balanced and checker for track and pitch before use, and the recommended boring 210
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