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Aviation History
1923
1923 - 0261.PDF
MAY 17, 1923 THE SWANSON MODEL 3 SPORT 'PLANE THE little sporting biplane shown in the accompanying illustrations was designed and constructed by S. Swanson of Vermillion, South Dakota, U.S.A., and was given its £rst test flights last September. The test pilot on this •occasion was Lieut. Vert Roggers, and on the first attempt he took the machine off after a short run over rough ground, thick with undergrowth, made one circuit of the field and then made a perfect landing. He took off again immediately, and climbing to a height of 1,000 ft. circled over Vermillion for about 15 mins., making another excellent landing at the conclusion. He reported that the machine was well balanced and light on the controls, answering promptly to the various manoeuvres. Upper and lower planes are of " one-piece " construction, the spars being of routed I-section spruce, spliced in the •centre to form a continuous beam with a dihedral angle of 4°. The webs of the ribs are of bass-wood, with the usual lightening holes, and the cap strips of spruce. The upper plane has a The fuselage is of the girder type, built-up of spruce, with ash longerons forward of the cockpit. The fuselage tapers to a horizontal knife-edge at the rear, and is given a good stream- line by means of bass-wood stringers. The cockpit is ex- ceptionally roomy for so small a machine. A 3-hr, petrol tank is mounted forward of the cockpit, just over the e.g. The engine is separated from the fuselage by an aluminium partition, and the cowling is of 20 ga. aluminium. The engine is an air-cooled 2-cyl. opposed Lawrence of 28 h.p. (1,500 r.p.m.), and the tractor screw has a diameter and pitch of 5 ft. 6 ins. The carburettor is mounted outside the fuselage, thus minimising the risk of fire. The undercarriage is of the V-type, with a split axle, hinged 9 ins. on each side of the centre, and sprung by the usual rubber shock-absorbers. The struts are of streamline ash, and the wheels are 24 ins. by 2 ins. Standard stick and foot rudder-bar control is fitted, the movements of the surfaces being geared down. Two views of the Swanson Model 3 Sport 'Plane, 28 h.p. Lawrence engine. •cut-away at the centre over the cockpit, and is fastened to the centre N-struts by four bolts. The lower plane is secured to the underside of the fuselage by three bolts. Ailerons are fitted to the lower plane only, and the aileron control wires run within the lower wing. Upper and lower planes .are separated by a single I-strut each side. These struts are of built-up spruce laminations. The landing and flying wires are •fc in. cable, the flying wires being double. The fixed horizontal stabiliser is built into the fuselage, and has an unsymmetrical streamline section, the top camber being two-thirds and the bottom camber one-third. The rear spar, to which the elevators are hinged, is a continuous beam forming part of the fuselage stern post. The elevators are of the divided type^ with a negative rake of 20°. The vertical fin is also built into the fuselage, and projects through on the •lower side, orming a small lower fin, to which is attached the rubber-sprung ash tail skid. The hinged edges of the elevators and rudder are rounded, and fit into a groove in the edges of the fixed surfaces so that no gap is left between the surfaces, thus ensuring-a smooth and even flow of air. There is no .external bracing on the tail plane whatever, and the control horns are built into their respective surfaces. The principal characterisitics ofSpan ChordGap Stagger Overall length Wing curve Angle of incidence (top) . . Angle of incidence (bottom) Decalage DihedralArea of main planes Area of aileronsArea of stabiliser Area of elevators Area of fin Area of rudder Weight empty .. .. v Weight with full load Weight per h.p. Weight per sq. ft. Speed range this machine are :—.. 18 ft. 9 ins. .. 2 ft. 10 ins... 3 ft. 4 ins. .. 1 ft. 2 ins. .. 15 ft. .. U.S.A. 15. .. 3J° ..2° .. li°.. 4° .. 100 sq. ft... 12 sq. ft. .. 7 sq. ft... 5 sq. ft. .. 3 sq. ft... 3 sq. ft. A. .. 370 lbs... 570 lbs. •"• .. 20 lbs. . . .. 5-7 lbs. ;„,. 40-90 m.p.h. Air Service Accounts ' THE Air Ministry Appropriation Account has just been published as a Parliamentary Paper (No. 31), from which the following figures may be of interest. The actual gross expenditure in the year 1921-22 was £16,394,680, which was less than the estimate by £3,388,286 ; and the actual receipts were £2,770,631, or £1,399,141 more than the estimate. The net surplus is £4,787,427. The total awards to inventors made during the year amounted to £280,342, whilst under the heading of " Balances Irrecoverable " is included the sum of £96,415 for stocktaking deficiencies at the R.A.E. due to machines crashed in France during the War and duplications of store charge; omissions of accounting adjustments in respect of spare engine parts built into larger parts or complete machines ; and deficiencies disclosed at the closing down of a balloon stores depot in November, 1921. 261 c2
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