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Aviation History
1934
1934 - 0170.PDF
UARY 22, 1934 Perspective views of the bottom wing root show- ing the tubular steel construction, engine mounting, fuel tank stowage and undercarriage. Future machines will have single, instead of double, compression legs each side of the wheel. (FLIGHT Sketches.) either side of the fuselage, making the cabin light and pleasant, a feature which is enhanced by the two top lights normally provided in the roof of the cabin through two emergency exit panels. There is generous head, room as the average height of the cabin is 6 ft. 3 in. (1,9 m.), and the total cubic capacity in the machine available for the carriage of load is 594 cu. ft. (16,82 m3.). A fully controllable fresh-air ventilator system, which ventilates without causing draught, and a cabin-warming equipment is, of course, fitted. The machine has not got dual control in its present form, but the pilot sits right forward in a cabin separated from the passenger compartment by a bulkhead and door. In this position he has a well-nigh perfect outlook, and the slope of the windscreen, combined with the speed of the machine, should obviate any obstruction of the glass due to snow or rain. Nevertheless, the two large side panels are single pieces of Triplex glass which may easily be lowered, to give a clear and unobstructed outlook forward and to the side. The second member of the crew is accommo- dated on the starboard side of the pilot and behind him, in which position there is ample room for a full wireless equipment as well as a chart table and stowage for the navigating equipment generally. Structurally the " 86 " is interesting, as it is the first machine incorporating a new method of using plywoo^and spruce. Our artist's sectional sketch shows that the fuse- lage is primarily a three-ply box, but it has this great difference from the normal type, in that the fuselage is built with the plywood inside the box, and with the spruce longerons, struts and stringers, outside it. Outside this again is a complete fabric covering, doped, as are the other covered units, with Titanine, giving a weatherproof and durable finish. This method of forming the fuselage pro- vides clear walls, floor and roof, and also conserves space, as the sound proofing material, in this case Cabot quilt- ing, can be packed between the plywood and the fabric in the space made by the longerons and stringers. Aft of the main planes sheet Elektron guards are placed over the corners of the fuselage, serving both to give a better shape to the fuselage and to obviate taking the fabric over the otherwise sharp corner. The tail units are, in general, normal de Havilland design and construction. Their shape is, of course, typi- cally " D.H.," and their construction is of spindled spruce spars, fairly substantial spruce ribs, and a covering of 0.8 mm. plywood. Over the whole there is a covering of fabric and then the usual dope. The elevators (and the ailerons) are not aerodynamically balanced and are con- trolled by straightforward dual cables between the control 170
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