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[[degree]] of perfection which the airscrews and gears as well as the external form of the airship has attained and also therefore serves as a common measure from the aerodynamic point of view for all types and sizes of airships.

The disposable lift, that is the proportion of the total lift which is available for fuel and oil, ballast, stores, crew, passengers, mail, and freight, after allowing for all structural weights and machines, is determined by the magnitude of these dead weights and by the normal lifting power of the gas which gives the ship its buoyancy.

If "A" is the total lift of the ship for some specified atmospheric condition, and "G" the total dead weight, while "Q" is the useful load, then A minus G equals Q. The efficiency of structural design may be expressed as the ratio of disposable lift to deadweight:

y = Q/G = A/Q – 1 which is called the lifting efficiency.

It can be used to illustrate the comparative degree of efficiency to which the structural design and the disposition of materials has been developed in different types and makes of air-ships of similar size and speed and of similar requirements. When comparing airships of different size and speed and equipped

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