decoys - supposed to sound like cavitation?

GoldenRivet · 04-17-08, 04:52 PM

it was a chemical device.

the canister contained a chemical called calcium hydride that reacted with sea water and formed a mass of bubbles. (think of a giant alka-seltzer tablet)

not only would the bubbles produce a slight noise that would possibly capture the interest of a hydrophone listener... more importantly, the large cavity of bubbles would reflect active sonar pings as if they were a solid object.

in theory the return would be larger or similar in size to the u-boat. so... the destroyer would either attack the bubbles or would be faced with the decision of which "echo" to attack.

EDIT: to summarize... they were more to fool active sonar pings than to create a noise cavitation.

04-17-08, 04:52 PM	#2
GoldenRivet Subsim Aviator Join Date: Mar 2007 Location: Texas Posts: 8,726 Downloads: 146 Uploads: 0	it was a chemical device. the canister contained a chemical called calcium hydride that reacted with sea water and formed a mass of bubbles. (think of a giant alka-seltzer tablet) not only would the bubbles produce a slight noise that would possibly capture the interest of a hydrophone listener... more importantly, the large cavity of bubbles would reflect active sonar pings as if they were a solid object. in theory the return would be larger or similar in size to the u-boat. so... the destroyer would either attack the bubbles or would be faced with the decision of which "echo" to attack. EDIT: to summarize... they were more to fool active sonar pings than to create a noise cavitation. __________________