MEASUREMENT PROGRAM TO DETERMINE STATIC ELECTRICITY CHARGING CURRENTS IN HELICOPTER MAIN ROTOR BLADES
Rept. for Jun 1962-Aug 1963
UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV
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A SH-3A main rotor blade was electrically insulated from the rotor head and connected to measuring apparatus to determine to what extent the main rotor blades contributed to the electrostatic charges on helicopters. Testing was performed on test stands and on a SH-3A helicopter in various environmental conditions. It was found that in clear-air conditions no snow, sand, rain, etc. electrostatic charging current due to main rotor blades is relatively small compared to the helicopters total current however, in environmental conditions snow, sand, rain, etc. the main rotor blades are the major contributors of electrostatic charging current.