Word: propellors
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Dates: during 1960-1969
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...other submarine entry is a propellor-driven job with twin rudders. While expected to be somewhat slower than Milgram's, its directional orientation is likely to be more reliable...
Another investigation he took part in had equally obvious immediate practical results. It concerned the cord "pigtails" one still sees adorning the wings of various propellor driven planes. The subject under study was "precipitation static" - an electrical charge picked up when a plane passes through certain kinds of rain or snow storms. These charges, pilots found, interfered with radio communication. Since electricity tends to concentrate itself on pointed surfaces, such as radio antennas, the investigators suggested the pigtails as a harmless discharge point for any excess charge...