A CONVENIENT method of classification is to group air services according to the length of stages that must be flown, since the length of the stage affects—broadly—the type of aircraft that must be employed. An aircraft that must fly non‐stop distances of between 3,000 and 4,000 miles must carry, in addition to the payload, a very large load of fuel. The total load of payload and fuel is proportional to the gross weight of the aircraft and, therefore, to its dimensions, the horse‐power to propel it and the cost of operation. To employ such an aircraft to carry an equivalent payload over a short route of some 200 miles would be uneconomic, for that work could be done more efficiently by aircraft that were smaller, lower‐powered and cheaper to operate, since these need not be designed to carry the very large load of fuel, in addition to payload, that the long‐range aircraft must carry.
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