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Aviation History
1925
1925 - 0159.PDF
MARCH 19, 1925 kSWEDISH SEAPLANE, S.II," WITH ROLLS-ROYCE ENGINES : Our photograph shows a formation ofthese machines flying over the Swedish coast. bolted to a suitable stand and tested under conditions resem- bling those obtaining in the actual machine. The engine fitted is a^60_h^_Rolls-Ro_vceJ' Eagle," and the installation is partly shown in one ofour photographs. The engine cowling is quickly and easily removed, when the whole of the engine unit can be inspected. The petrol tank, which has a capacity sufficient for five hours at full throttle, is placed immediately aft of the engine bulkhead, and is, as will be seen from the photograph, replenished by men standing on the inner end of the wings. A nose radiator of usual type, fitted with shutters for varying the cooling, is provided, the propeller shaft passing through it. Constructionally, the wings are of normal type, with box spars of spruce and three-ply, spruce ribs, and fabric covering. The various compartments of the box spars are not entirely separated from one another, that is to say, the wood blocks, or partitions, are provided with openings, and the interior of the spars can, it is stated, be ventilated by means^of air pumps so as to get rid of any moisture that may have collected. The internal drag bracing is in the form of steel tube drag struts and stranded cables. The wing is built in two halves, attached to the sides of the fuselage, and braced by N-struts to the floats below. It is stated that the factor of safety of the wings is 10-5, but it should be pointed out that this figure is based upon the loads in normal horizontal flight. The triangulation of the float undercarriage struts, which are weldless steel tubes with wood fairings, can be seen in the general arrangement drawings. The floats themselves are of the single-step type, and are of all-wood construction. They are covered with ply-wood and provided with several water-tight bulkheads, each compartment having its inspec- tion door. It is stated that the float volume is such that one float will support the machine, so that sinking is practic- ally precluded. The attachment of the floats to their struts SPAN 59-6 LENGTH -4l'-6" WING AREA 567 SQ. FT. SVENSKA AERO AB. SEAPLANE TYPE s.n ROLLS-ROYCE " EAGLE" ENCINE SWEDISH "S.II SEAPLANE, ROLLS-ROYCE "EAGLE" ENGINE to scale. 159 General arrangement drawings,
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