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Aviation History
1919
1919 - 0498.PDF
of V struts connected by a longitudinal member, mounted on the bottom of the fuselage. The front pair of these stub axles lies at right angles to longitudinal axis of the machine, and the other pair is inclined back to the rear V of the cabane. Extending upwards from each outer extremity of this " axle- Vee " is a steel tube which is connected at its upper extremity to the end of a lever projecting through the sides of the fuselage and hinged at its other end to the centre of the fuselage-iormer. Near the outer extremity of this lever is a lug from which connection is made to an oleo shock- absorber and to a pair of ordinary elastic shock-absorbers. There is a similar gear on each side of the fuselage. Thus, on landing, as the wheels rise, they also lift the levers against the action, first, of the oleo, and then of the elastic absorbers. and containing a steel spring, which absorbs the shocks on striking the ground. The engine is a Rolls-Royce Eagle VIII, mounted, as previously stated, on two strong ash bearers between the first and second formers. It is enclosed by an aluminium bonnet, whilst a " manhole " in the bottom of the fuselage gives access to the engine from underneath. The cooling system is very efficiently carried out, and is made up of two long streamline-shaped " honeycomb " radiators, mounted, one on each side of the fuselage. They are connected top and bottom to two tanks within the fuselage, as indicated in one of the accompanying sketches On the back of each radiator is a shutter, which can be opened or closed from the pilot's cockpit. A neat and simple THE B.A.T. FOUR-SEATER BIPLANE On the left, a sketch of the pilot's seat and control. On the right, the tail plane trimming gear, and inset, a detail of the screw-gear of the latter The levers above referred to are of welded steel box con struction, and it will be noticed that the wheels are splayed, so that when in flight they point inwards in a down direction, and when on the point of landing they are more or less hori zontal, and when the machine is at rest, with its full weight on the wheels, they point inwards in an up direction. The general arrangement and construction of this landing gear is clearly shown in our illustrations. Another interesting feature is in the tail skid. This is of the steerable type, and consists of a short steel-shod wooden skid anchored at its upper end to a tube passing up through, and secured to, the rudder post. The " head " of the skid is connected to a lug some distance up the rudder post by two telescopic tubes passing up through the rudder, oil-cooling radiator is also fitted ; this is shown in one of our sketches, and consists of an extension of the oil tank next to the engine projecting through the starboard side of the fuselage, and having a series of tubes passing through it from front to rear. This projection also carries the oil filter and filling-cup. As previously mentioned, the fuel tanks are located in the compartment between the engine and the cabin. Petrol is delivered direct from the main tank to the carburettor through the agency of two windmill pumps mounted above the turtle deck and the tanks. There is, however, a small service tank, for emergency, let into the leading edge of the top centre section. The estimated maximum speed of the B.A.T. F.K. 26 is no m.p.h., whilst the landing speed is about 40 m.p.h. TELESCOPIC TUBE WITH INTERNAL SPRING SOME CONSTRUCTIONAL DETAILS OF THE B.A.T. FOUR-SEATER BIPLANE.—On the left is the top plane attachment to the centre section, which is similar to those on the lower plane. In the centre is a SKeicn of the steerable tall skid, and on the right is the strong but simple elevator crank 498
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