FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1949
1949 - 0909.PDF
592 F LI GH T Marathons on the Way WEIGHT ANALYSIS Structure weightPower units Fuel systemPower services ... Sundries Radio, furnishings, heating, precautions, instruments, etc Crew and baggage Basic equipped weight... Passengers and baggage Fuel (167 gall. 500-mile range) Oil (28 gall) All-up weight 5.353 Ib 4.292 1b 200 1b 662 1b2221b 10.729 Ib 1,156 Ib 11,885 Ib 535 1b 12.420 Ib 4,126 ib 1,202 Ib2521b 18,000 Ib (Above) The tail ends of the nacelles contain the flap-operating mechanism. As the flap moves rearwards and downwards the hinged beak-like cover Opens up. The Mamba-Marathon carries small dummy nacelles in the outboard engine position to house this mechanism. future of the Marathon i will be appropriate at this point. 'The aircraft was designed for short- and medium-range passenger transport, and by virtue of its clean exterior the cruising speed is high. Up to 22 passengers and their luggage can be carried, but a 20-seat version will probably be the standard arrangement. The advantages of a four- engine layout for passenger work are well known, and the ability of the Marathon to exceed the proposed 1952 I.C.A.O. safety requirements may become increasingly important. The engine power available (4 x 345 h.p. for take off and 4 x 275 h.p. for economical cruising) is modest but adequate, and the most economical speed of operation at 10,000ft is no less than 200 m.p.h. At 5,000ft it is only 10 m.p.h. slower. Economical stage-lengths are between 150 and 400 miles. Maximum landing weight is the same as maximum take-off weight, so the Marathon may be operated fully loaded on any trip. As a freighter the Marathon can carry a payload of 4,000 lb for 500 miles. From the manufacturers' point of view the order for 40 Marathons is satisfactory for a start, but additional orders are being sought all over the world. The Marathon is of all- metal construction and should be suitable for operation anywhere in the world. Moreover, it is virtually in a class of its own, its only direct competitor being the Beechcraft Model 34, known as the Twin-Quad, which is a fraction larger, and has four 375 h.p. Lycomings and a rather higher range and rate of climb. The economical cruising speed, however, is somewhat lower. Many months ago one of the criticisms levelled at the;. Marathon was on the score of its short range. The addfcl; tional fuel capacity of 60 gallons (4 x 15 extensions) whichl is now provided will make a substantial improvement in this respect and, moreover, the increase in all-up weight from 16,500 to 18,000 lb will greatly improve the economics.r The aircraft is intended for operation by a crew of two • but provision is made for the carriage of a third member*- The crew compartment is unusually spacious and the view; forward exceptionally good. The pilot, in high seat-position," can, in fact, see the ground 12ft in front of the aircraft, and his range of vision round the horizon is 210 degrees. Most of the aircraft services are pneumatically operated. These include the nose-wheel undercarriage, flaps, brakes,* priming pumps and engine air-intake shutters. The air layout of instruments, and below are, respectively, the electri- ' and starting panels, n furnishing is under 'deration at the pre- sent time and Rumbolds are busy fitting out a mock-up with materials in four shades of grey, deepening in strips from ceiling to floor.
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
