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Aviation History
1918
1918 - 0647.PDF
JtWB 13, 1918. consists of 18 springs. A yoke of stranded steel cable restrictsthe movement of the axle beyond a certain limit. The tyres are 32 ins. x 6 ins. — 810 x 150. A tail skid of.massiveproportions is used. This is of the shape shown in photo- graph E, and is built up entirely of welded steel. The springsagainst which it works are concealed inside the tail end of the fuselage. -k •, . Wireless. •'* •••••• The machine is internally wired for wireless, and a specialdynamo for supplying current for this purpose and also for heating is installed on the right hand engine. Thisdynamo bears the following inscription :— Telefonken; J. P. Flieg. C 1916. Type D.Alternating current 270 watts. 5 ampAres. 600 frequency. Continuous current 50 volts. 4 amperes, r.p.m. 4,500.The dynamo is mounted on brackets acetylene-welded to the steel engine bearers, and is normally completely enclosedin a detachable fairing. Its position is clearly shown in photograph F. The dynamo drive embraces the pulleywhich is a standard fitting on the 260 h.p. Mercedes, but in this particular case the clutch gear whereby the driving pulleycan be disconnected from the engine as required appears to have been discarded. Two sets of wires are taken from thedynamo inside flexible metal conduits to a pair of plugs situated at the junction of the fuselage and the right handlower main plane. Here they terminate in plug sockets, so designed that the plugs cannot be inserted wrongly. Oneof these wiring circuits applies to the heating system, and wires for this purpose are carried to points in all three cockpits,whilst the other circuit is for wireless and terminates in a plug adapter in the rear cockpit. No wireless instrumentswere fitted. Two plug sockets for the heating installations are arranged in the rear cockpit; two in the pilot's cockpitand one for the forward gunner. A small plate on the pilot's dashboard carries the following inscription, but no definiteinformation is given :— F. T. Fitting. W/T Set.Aeroplanes. Type 94. NY 1125/16.Fitting, No. 85A. Driving propeller. Type.Length of aerial wires — Telefunken transmitter.—Huth transmitter, D transmitter metres.G transmitter. metres. In addition to these two circuits, there is a lighting installa-tion in conjunction with a battery carried in a box in the rear cockpit. From here, wires are taken to each cockpit and alsoto the tail and via the leading edge of the upper plane to the extreme outside strut of each wing. On these struts red andgreen lights are carried, the lamps for this purpose taking the form shown in. Fig. 29. Inspection, lighjts, are provided,at convenient points in each cockpit over the dashboard, instruments, &c.For the most part the lighting wiring is contained inside a light celluloid conduit. Direct coupling. metres,metres. Instruments.These comprise twin engine revolution counters, twin air pressure gauges for the petrol supply, electric thermometer,altimeter, petrol level gauges, &c. All of these are of recog- nised types and call for no detailed description. Camouflage.This machine is camouflaged in six different colours, on a uniform system covering every portion. The colours arearranged in hexagons measuring roughly 18 ins. across the flats, and the colours are sage green, reddish mauve, bluishmauve, black, blue and grey. These colours are not flat washes, but: are softened by being stippled and splashed with paintof a lighter tone. The effect gained is well shown in photo- graph G. Considerable care appearsto have been taken with this camou- flage scheme, which is presumablyeffective. Fig. 28. Fig. 29. Fabric and Dope.The fabric throughout is of good quality, and the dope acetate of cellulose. Propeller.Diameter 10 ft. 3-8 ins. ± .20 in. Pitch 59.3 ins.The following table gives the thicknesses of the various laminae used in construction of the air-screw. The laminaeare numbered from the trailing to the leading edge :— No. 1 2 3 4 5* ThicknessMaterial in WalnutMahogany MahoganyMahogany Mahogany inches. •73 •80 •80 •80 •80 No. 6 7* 8* 9 10 Material.Mahogany Mahogany MahoganyMahogany Walnut Thicknessin inches. •80 •4P •40 •80 •83 * These laminations were of a quMe different kind of mahogany, probably African. Only one air screw has been seen and dimensioned. Thusit is unknown whether all air screws would have laminae of similar thicknesses and of similar timbers. There is noapp.ar.ent reason why these laminae should be of different thicknesses. It is surmised that either the enemy is shortof timber or that he has a highly scientific reason for so doing that we do not know. The port and starboard air screwsrotate in opposite directions. K. Three-quarter rear view. 645
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