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Aviation History
1918
1918 - 1025.PDF
SEPTEMBER 12, 1918. TWO-SEATER RUMPLER BIPLANE, G. 117. (260 H.P. MERCEDES 'ENGINE.) Report by the Technical Department, Aircraft Production, Ministry of Munitions. THIS machine, which was used by the enemy at the com- mencement of the year, is of the CV type, but differs only in detail from the earlier CIV type. The general shape and disposition oi the wings is main- tained, including the characteristic sweep-back oi the main planes, and the fitting of ailerons to the upper planes only. Some important particulars follow :— Weight empty (but with water), 2,439 lbs. ; weight, fully loaded, 3,439 lbs. ; total military load, 545 lbs. ; area oi upper wings (with ailerons), 217-6 sq. ft.; area of, lower wings, 146 sq. ft. ; total area of main planes, 363-6 sq. ft. ; loading per sq. ft. of wing surface, 9-5 lbs. ; area of tail Control. Longitudinal (elevators), good. Lateral (ailerons), very heavy and very ineffective. Directional (rudder), moderately light and quite effec- tive. It is reported that the machine is tiring to fly owing ^o the very poor lateral control ; that it is nose-heavy, ana rather liable to get into a.spin. Wings. The upper wings have a maximum span of 41 ft. 6 ins. and a chord of 5 ft. 8 ins. The span of the lower wings is 40 ft., and the chord is 4 ft. 4 ins. ' - . Front view of the 2-Seater Rumpler. plane, 22 sq. ft. ; area of fin, 4 sq. ft. ; area of elevators, 20-8 sq. ft. ; area of rudder, 6 sq. ft. ; total weight per horse-power, 13-2 lbs.; petrol capacity, 59 gallons; oil capacity, 3 gallons ; water capacity, 10 gallons ; endurance, about 4 hours. Performance. Speed Speed Climb Climb at . at . to . to . ft. . 10,000 . 15,000 ft. 10,000 15,000 m. 16 s. 0 m.p.h.100.5 87 Rate of climb in ft. per min. 400 revs.1,510 i,39o revs. 1.375 Service ceiling, 15,500 ft. (estimated). Estimated absolute ceiling, 17,500 ft. Greatest height reached, 15,300 ft. in 38 min. 25 sees. Rate of climb at this height is 125 ft. per min. The wings are swept back through an angle of 3 degrees, and are set at 2J degrees dihedral angle. The wing sections of upper and lower planes are given in Fig. 1. Bath front and rear spars are of spruce, and are constructed in two halves, which are grooved and tongued, and then glued together. This is clearly indicated in Fig. 2. The ribs are built up of ply wood and strips in the usual manner, and are of good workmanship^ Short ribs join the front spar to the leading edge, alternately with the true ribs. The wing construction appears adequately strong. Steel compression tubes are placed between the spars, and are braced by ties varying from piano wire at the wing tips to cable and swaged rod at the inner end. The trailing edge consists of a flattened steel tube, to which the ribs are attached by copper rivets. Ailerons are fitted to the upper wing only, which may in some measure account for that ineffectiveness of lateral Rear view of the 2-Seater Rumpler. 1025
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