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Aviation History
1918
1918 - 1403.PDF
DECEMBER 12. 19x8 THE HALBERSTADT TWO-SEATER TYPE C.L. IV [Issued'Jty Technical^Department (Aircraft Production), Ministry of Munitions] and connected the spars of the port and starboard lower wings is no longer found. Its place is taken by two fuselage fittings of the type shown in Fig. 4. THIS machine, which is allotted G/5Bdr./22, landed nearChipilly on August 23rd, 1918. Dates stamped on the main planes give the date of construction as July, 1918. It is very similar in design and construction to the C.L. IItype, which has already been fully reported upon (see issue of " FLIGHT " for October 10th), but many detail differencesare incorporated. Below is a comparative list of the principal dimensions ofboth C.L. II and C.L. IV types :— C.L. IV C.L. II Span of upper plane .. .. 35 ft. 2$ in. 35 ft. 3£ in.Span of lower plane .. .. 34 ft. 9j in. 34 ft. 11 in. Chord of upper plane .. .. 5 ft. 2f in. 5 ft. 3J in.Chord of lower plane .. .. • 4 ft. 3$ in. 4 ft. 3$ in. Gap, maximum .. 4 ft. 4 in. 4 ft. o in.Gap, minimum .. .. .. 4 ft. o in. 3 ft. 8J in. Dihedral angle of lower plane .. 2 deg. 2 deg.Horizontal dihedral of main planes .. .. .. 4 deg. Total area of main planes .. 308 sq. ft.Area of each aileron .. .. 12 sq. ft. Area of aileron balance .. 2.0 sq. ft. Area of tail planes .. .. 16 sq. ft. Area of elevator .. .. 13.6 sq. ft. Area of fin .. .. .. 11.4 sq. ft.Area of rudder .. .. .. 7.9 sq. ft. Area of rudder balance .. 1.0 sq. ft. Horizontal area of body •—.. 36 sq. ft.Vertical area of body .. .. 41 sq. ft. Length overall .. .. .. 20 ft. 11J in. Engine .. .. .. .. 180 Merc. Capacity of petrol tanks .. 34 galls. Capacity of oil system .. .. 4 galls. Crew .. . • .. .. TwoGuns .. .. .. Wings The wings, both in disposition and construction, aresubstantially the same as in the'former machine. The char- acteristic wash-out at the root of the lower planes is evenmore pronounced than was the case in the C.L. II machine. It will be seen from photograph A that the rear spar is bentand twisted by this wash-out. The exact shape of the trailing edge of one of the lower planes is shown in the scaledrawings. Fig. 1 gives a section of the upper wing drawn to scale,and Fig. 2 a comparison of the upper aerofoil of the C.L. IV with the R.A.F. 14 section, which is dotted. From Fig. 1it will be noticed that the 3-ply surrounds to the spars are still employed. They are drawn to scale in Fig. 3.^The ailerons remain unaltered in the C.L. IV machine, and this is also true of the interplane and centre section struts. The attachment of upper wings to centre section and oflower wings to fuselage are unaltered, except that the tube which, in the earlier machine, passed right across the fuselag; 310 sq. ft.12 sq. ft. 2.0 sq. ft.13.6 sq. ft. 12.4 sq. ft. 6.4 sq. ft.7.9. sq. ft. 1.0 sq. ft. 44 sq. ft.52.8 sq. ft. 24 ft. o in.180 Merc. 34 galls-. 4 galls.Two One fixed and one movable Fuselage ' **" Although the fuselage of the C.L. IV machine is very likethat of the C.L. II type, the machine now being described has a body which is practically 3 feet shorter than that ofthe earlier machine. _ Tail planes and Skid -•'•'••'•—. -£-S'. It is in these components that the greatestrdifferences be-tween the two types are found. The tail plane is now in one piece, and is laid across the rear of the fuselage, and attachedthere by the bolts shown in Fig. 6. The undivided elevator is now balanced, and the' aspect ratio of the whole horizontaltail is larger than was the case in the earlier model. Besides this the actual area is greater. (It has been remarked thatthe C.L. IV body is 3 feet shorter.) The fin and rudder were not salved, and comparison istherefore not possible, but it is clear from the fuselage design that the fin is a separate unit simply attached to the body,and not an integral part of it. It is also established that the rudder post is now found in the same vertical plane asthe leading edge of the elevator. It will be remembered that the rudder post, in the C.L. II type, was fixed more thana foot forward of the elevator fulcrum. The inverted camber of the C.L. II tail plane is nowabolished, and a symmetrical camber substituted, and the rather elaborate tail skid of the earlier model has been simpli-fied to the type found in the modern L.V.G. biplanes. In this type the skid is entirely exposed, and is pivoted on thelower edge of a small triangular fin under the tail plane. (See photograph and general arrangement drawings.) __ Undercarriage The landing gear is substantially the same as in the C.L. II machine, but, as may be seen in Fig. 5, two compression tubes now run parallel to the axle, instead of one, as before. Fittings ' "•"" , '' The gun ring has been additionally stayed in front, butotherwise remains the same. It was fitted with a Parabellum gun. Two fixed guns of the Spandau type are arranged for, oneeach side of the camshaft, but only the one on the starboard side was fitted at the time of capture. A ten-loop Very cartridge belt is tacked to the top of thefuselage just behind the cockpit—it may be seen in the photo- graph—and a total of twelve light hand grenades may becarried in the wooden racks, one of which may be seen on either side of the fuselage. The practice of enclosing the control wires in the cockpitis still continued, but aluminium shields are used instead of the more permanent three-ply construction. The machine is internally wired, but no wireless apparatus Side view of dismantled Halberstadt CX. IV. I4°4
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