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High energy content per unit weight High energy content per unit volume Easy handling Low cost "Unfortunately for most of the commonly used fuels, these requirements tend to be mutually exclusive. Today, however, a new class of 'exotic fuels' encompasses all these requirements."Mr. Cracknell pointed out that "the first aviation fuels were hydrocarbons, and with comparatively minor modifications they still hold the field today. They have given good service and appear to meet all the requirements. If this be the case, why the incentive to change and why the interest in new highenergy fuels, especially those of the lightweight elements?" He said also that "for the civilian operator there is at present no incentive, but for the military every last iota of efficiency and performance counts.

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