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Aviation History
1941
1941 - 0151.PDF
JANUARY I6TH, 1941. v-, -4-. One of America's latest commercial transports, the Lockheed Lodestar, in flight over California before delivery to South African Airways which is re-equipping almost entirely with this type. THE LOCKHEED LODESTAR Particulars of Model 18, Type 17 PCLM, Commercial Transport : THE complete specification details of that modernall-metal American transport, the Lockheed Lode-star, have now been released. Known as the Model 18, it has been ordered in large numbers by airlines all over the world, and deliveries are now being made. Brief technical details were given in Flight of January i8th, 1940, but now it is possible to publish full information of this stressed-skin airliner. This has been supplied in most complete form by the company. In fact, it is prob- ably correct to say that the following specification is the most complete which has ever been issued. It will be noticed that not only are weights, loadings and performances given, but also such interesting parti- culars as aspect ratio (which is nearly 8) and wing area, ""both with and without that area of the fuselage which ? is always debated as to whether it should be regarded as a part of the lifting surface or not. Also the range of the centre of gravity as a percentage of the mean aero- dynamic chord is set down and it may move between .285 and .390. This latter value is very far aft. Airline operators will be interested in the dimensions of the cabin, including the volume of the cargo compartment. Performance and Equipment Performance data shows the take-off run to be between 328 and 360 yards (according to type of engine) at the fully-laden provisional weight of 18,500 lb. At the stan- dard gross weight of 17,500 lb. it will be somewhat less. It will be noticed that the landing speed of 65 m.p.h. is for the weight of 17,500 lb. The trend of modern design is seen in the high wing loadings of 31.76 and 33.5 lb./sq. ft. for the two loaded weights. To retain the moderate landing speed of 65 m.p.h. is only possible with the very efficient Fowler flaps which are fitted. Wing tip slots of the built-in type are also provided. Fixed slots of the "pillar-box " type are built into the wingtip to guard against wing-dropping near the stall. In the illustration it will be noticed that the tailplane sits high on the fuselage. This is the result of research on the prototype, which disclosed a condition of vibra- tion in the tail due to interference of the slipstream and the tailplane. This was completely cured by raising the tailplane about one foot. This commercial transport should be very successful on the air routes of the world. Equipment: 2 Hamilton Standard, full feathering, 3-blade, Hydromatic, constant speed airscrews. Lofck- heed-Fowler type flaps. Lockheed slots. Built-in pro- vision for future installation of de-icer boots in leading edge of wing and stabiliser. Twin tabs in ailerons, rudders and elevators. Hold-down straps in all cargo compartments. Electrically illuminated signs, "Please fasten safety belts " and " No smoking." Eclipse Direct Drive starter on each engine. Ash tray, pamphlet pocket, stewardess call button, individual reading light, and hat clip at each seat. Heating and ventilating systems. First-aid kit. Complete lavatory equipment. Optional colours for floor and cabin linings. Pressure fire extinguishers to power nacelles. 1 hand fire extin- guisher in cabin and 2 in pilots' compartment. 2 3- minute flares. 1 Flight Instruction Manual. 1 Service Manual. 1 set Engine and Aircraft Log Books. 1 high- pressure air pump for pneumatic shock struts. 2 engine tool kits. 1 Cannon battery cart plug handle. Jack
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