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【范围】
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The purpose of this SAE Aerospace Information Report (AIR) is to illustrate the effect of
installation power losses on the performance of a helicopter. Installation power losses result
from a variety of sources, some associated directly with the basic engine installation, and
some coming from the installation of specific items of aircraft mission specific equipment.
Close attention must be paid to the accurate measurement of these losses so that the
correct aircraft performance is calculated.
Installation power losses inevitably result in a reduction in the overall performance of the
aircraft. In some cases, careful attention to detail will allow specific elements of the overall
loss to be reduced with immediate benefit for the mission performance of the aircraft. When
considering items of equipment that affect the engine, it is important to understand the effect
these will have on overall aircraft performance to ensure that mission capability is not unduly
compromised. Alternatively, a clear understanding of these effects at the aircraft design
stage may have an influence on the initial choice of engine size to ensure that mission
performance targets are subsequently met. This report aims to give a general understanding
of the effect of installation power losses on helicopter performance by the use of a set of
example calculations.strRefField
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