GROUND POWER CHECKING OF HELICOPTER ENGINES. TESTS WITH A HOVERFLY 1
AEROPLANE AND ARMAMENT EXPERIMENTAL ESTABLISHMENT BOSCOMBE DOWN (UNITED KINGDOM)
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The investigation was conducted to determine the possibility of ground checking the power of helicopter engines. Tests were made with both standard blades and blades fitted with attachments. In addition to confirming that power checks which involve tethering are unsatisfactory, the tests indicate that power checks should be made under low-lift conditions. Two methods of achieving this condition were investigated one using lift spoilers at high pitch and the other using drag plates at low pitch. The latter method appears to be more satisfactory in providing a practical solution, without undue handling problems, by which power variations of the order of 2 can be detected. This method may be suitable for use by qualified ground crew provided that precautions are taken to prevent the occurrence of dangerous blade motions.