Description and preliminary flight investigation of an instrument for detecting subnormal acceleration

Garland J. Morris, Lindsay J. Lina
naca-tn-3252
Nov 1954


An evaluation has been made of a prototype instrument designed to give an immediate indication of loss in airplane acceleration due to power deficiency or increased resistance at any time during take-off at which the pilot still has a choice of continuing or stopping. The principal components of this instrument are a linear accelerometer and a pressure diaphragm coupled together so that the normal decrease in acceleration with increasing velocity during take-off is compensated by the increase in dynamic pressure in order to give a constant predictable indicator reading as long as the thrust and resistance are normal.

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