Accession Number:

AD0271432

Title:

EQUIVALENT FIELD METHOD FOR TESTING AIRCRAFT STATIC DISCHARGES

Descriptive Note:

Corporate Author:

LIGHTNING AND TRANSIENTS RESEARCH INST MINNEAPOLIS MINN

Personal Author(s):

Report Date:

1962-01-01

Pagination or Media Count:

1.0

Abstract:

A new test system for aircraft static discharges was devised to permit comparison of standard type dischargers with new dischargers which require specific orientation with RF fields about aircraft. The system consists of a simulated aircraft section, surrounded by an octagonal screen chamber shaped to reproduce approximately an equipotential, as measured about a model aircraft in an electrolytic tank. The new system preserves the electric field relationships which would be found at a discharger extremity in flight and permits correlation of the field magnitudes by use of electrolytic tank plots. A theoretical study of radio interference fields produced by corona discharges on metal and resistive needles was carried out. Studies indicate that for the assumed geometry, an orientation parallel to the supporting aircraft surface reduces the interference field magnitudes by approximately a factor of 200 over an orientation perpendicular to the aircraft mounting surface. Also corona discharges from resistive points show an additional reduction in interference magnitudes of about 200 over the corresponding metal point discharges in either orientation. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE