In oceanographic instrumentation, LEBU (large eddy break-up) is a device for towed acoustic arrays. The purpose of the device is to reduce f noise around the towed array.
The LEBU includes two identical circumferential airfoils and two flat flanges. The flanges secure the device to a coupling on the towed acoustic array. This is helpful when using sonar or Echo sounding.
The device is U.S. Patent 5,020,033.
References
LEBU Wikipedia(Text) CC BY-SA