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Aviation History
1920
1920 - 0129.PDF
JANUARY 29, 1920 F/G 30 ARRANGEMENT OF BOURCES UNDERCARRIAGE \ BOURCES UNDERCARRIAGE FIG 31 to the fuselage and carries the piston head in which is mounted the pressure relief valve and constant leak holes. Aluminium end castings are arranged to support the fairing, which en- closes the shock-absorber rings and mounting spools. The lower spools are anchored to the lower end casting, which is free to slide on the central tubular member, and in conse- quence the load imposed by the shock-absorber rings is trans- mitted by the fairing to the upper end casting. An initial tension is given to the rings and the possible extension of the gear limited by a check cable anchoring the upper spools to the upper end casting. Bourges Gear (Figs. 30 and 31.) In the Bourges undercarriage Vee struts are arranged near the ends of the bottom centre wing section directly under the engine mounting struts. The two axles are jointed to the fuselage ort either side, and incline outwards to the Vee struts through which they are guided in a horn-block. The wheel is mounted on an overhung portion, allowing for quick and easy removal. Suspension is by rubber rings and oleo dashpot, but in this instance the two systems are entirely separate. The oleo gear is built into the horn-block and lies into the plane of the Vee struts thereby giving a minimum of resistance. The rubber rings are mounted on axle frames on either side of the Vee struts and pass under the apex of the Vee in the usual manner. Owing to the rearward inclination of the axle from its point of support on the fuselage, the ground reaction on the wheel gives rise to a couple tending to roll the axle over and cause the wheels to track incorrectly. This is provided against by arranging 10 rings forward of the axle and seven to the rear, the additional rings producing a correcting couple of the 129
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