838. A Definition of the Aircraft Stretch Efficiency Factor


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H R Rugg: 838. A Definition of the Aircraft Stretch Efficiency Factor. In: 29th Annual Conference, Washington, D. C., May 4-6, pp. 38, Society of Allied Weight Engineers, Inc., Washington, DC, 1970.



This paper presents a method of defining the aircraft stretch efficiency factor as a function of productivity and as a function of the aircraft's payload growth factor. The stretch efficiency factor, an effective means of evaluating the ability of a candidate aircraft to meet an arbitrary target mission, can also be used to evaluate potential methods of stretch and to estimate the amount of stretch required by each method. This paper also provides a means of estimating the payload capability and required take-off gross weight of candidate aircraft for the target mission requirements. The efficiencies presented in this paper are determined by using aircraft growth factors and the interrelationship of mission parameters. Since the method is independent of the target mission, growth factors and mission parameter sensitivities of a candidate stretch aircraft need only be determined once. In this study the optimal target and candidate stretch aircraft are determined by maximizing specific productivity. The study utilizes a computer trending model which displays outputs on a cathode ray tube (CRT). The interactive capabilities of the CRT terminal render it highly suitable for this method. Typical stretch efficiencies are presented for a transport helicopter.


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