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Accession Number:
AD0900415
Title:
Lightning Protection Techniques for Large Canopies on High Speed Aircraft.
Descriptive Note:
Technical rept. Jul-Dec 71,
Corporate Author:
MCDONNELL AIRCRAFT CO ST LOUIS MO AVIONICS SYSTEMS TECHNOLOGY DEPT
Report Date:
1972-01-01
Pagination or Media Count:
102.0
Abstract:
The objective of the work of this report were to determine by analysis and experimental evaluation the susceptibility of an F-15 canopy to a lightning strike and to develop lightning protection methods for large canopies. The primary hazard from a lightning strike to an aircraft canopy occurs if the canopy punctures and the lightning strikes the pilot. This hazard was analyzed mathematically and extensively tested on flat polycarbonate sheets, a simulated canopy and an actual F-15 canopy. Both the analysis and lightning simulation tests showed that the F-15 canopy will not puncture but rather that the lightning would flashover to the canopy frame. A detailed experimental investigation of corona inside the canopy due to the electric field from a lightning strike was performed. The investigation showed corona not to be a serious hazard but final assessment would require a medical study. High current tests were performed on the canopy frame and proved that the canopy mounting and frame could withstand 200,000 amp currents. Three lightning diverter systems were designed and tested. Two of the designs proved effective for large canopy application. It is concluded that additional lightning protection for the F-15 canopy is not necessary. It should be noted that although an F-15 canopy was used in this study, the results are general enough that they can be usefully extrapolated to include the canopies and dielectric surfaces on other air vehicles. Author, modified-PL
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
