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Aviation History
1918
1918 - 1313.PDF
MW*££3e&\ on centre section. Adjust the drift and anti-drift wiresuntil the plumb-line cuts the centre of fuselage cross tubes. (The centre section struts should be at right angles to thetubular engine bearers.) The undercarriage should now be NOVEMBER 21, 1918 The struts can then be inserted and the bracing temporarilyconnected up. The planes are then lifted up on to trestles and bolted to the'fuselage and centre section respectively.The trestles should be placed under the outer struts, care . \. V TYPE UNDERCARRIAGE. fixed and wired, up. Trammel the top halves of front and rear spray wires and then adjust the side bracing wires so that the plumb-line hanging] from centre section is 5 in. in front of centre of axle. Hang another plumb-line from centre of engine bearer cross-tube, and if the adjustment is accurate it should intersect the centres of axle, front and rear spray- being taken that they do not damage the ribs and fabricby undue pressure. To obtain the dihedral angle stretch a line tightly from the top plates of the outer struts on one sideto the top plates of the outer struts on the other, on both front and rear spars (Fig. 4). The adjustment is made onthe landing|wires so that a measurement of of in. is obtained or TAIL. OuTcrflt/ing Wires 25 Landing Wires, wire rings, and also the tail skid. In the case of the Vee >••• type undercarriage (Fig. 2) there is, of course, no question of any side bracing wires. Tail Plane The tail plane is now the next thing to go on the machine ,J' (Fig. 3). Place it in the brackets and adjust it by means of the bolts provided for the purpose so that its leading edge is § in. above the centre of the rear strut in the fuselage. Bolt on the fin and rudder post and also the stay-rods for the tail plane. Level tail plane laterally by means of the telescopic stav-rods. Fix elevators to tail plane and connect up' control cables. The control lever in the pilot's cockpit should be securely fixed by lashing it to the fuselage, keeping it central laterally but inclining slightly forward. Adjust the control cables so that the elevators are in continuation of tail plane. Their rudder must now be fixed and con- nected up with its control cables, and so adjusted that it is in line with the centre line of the fuselage. The rudder bar in the pilot's cockpit should be at right angles to the centre line. Care should be taken to see that all control cables run freely in the pulley-guides and fair-leads, and that they are free from kinks and frayed strands. The letter can easily be discovered by passing the hand over the wires, when a broken strand is quickly found. Main Planes When about'to erect the main planes it is a good plan to start by placing them on their leading edges on the floor. Inner FltfinscWires tot»r Dl HEPKAL ANOLE. Diagonal 1 musf equal +,12 imisreqnalJ between the line and the centre section struts. The measure- ment should be made just inside the centre section struts. Each bay must now be measured diagonally, and corre- sponding bays on each side must, of course, be the same Angle of Incidence and Stagger The method of obtaining the angle of incidence and staggei is as follows: Drop plumb-lines over leading edge of top I3M-
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