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Originally Posted by Rockin Robbins
In World War II we did not have data on these Japanese vessels as there was no way to study the ships to determine the RPM/speed curve for each ship. The only thing they could tell by the turn count was the relative throttle setting and whether the target was speeding up or slowing down. There was no connection made between RPM and speed.
What little information we had was for warships and I haven't seen a single record of a submarine encounter where prop counts were used as a speed determination.
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The link posted earlier (
http://www.maritime.org/fleetsub/sonar/chap4.htm) mentions this:
Quote:
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Prop-count detector changes the current so that the propeller beats stand out.
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Would this have been included in the system just to determine if the target was changing speeds, or were they considering the possibility of using the data being collected to perform speed estimates? Or was there another reason they had dedicated part of the system to this? It seems to me that they wouldn't have used valuable space for a system they didn't intend to be used.