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20 June 2019 00:39

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Asked by: david cwalina
Subject: torpedo gyro creep
Question: In an old paper on WWII torpedo gyros I found a formula for the lateral placement error due to gyro creep as 3.63-5 R sin(lat) * t where R is run distance (v*t, single speed). This is 1/2 of a standard derivation based on particle drift due to the coriolis effect (1/2 at^2 where a = -2 omega v sin(lat) and omega is earth rotatation ~7.3e-5 rad/sec. The reason given is "The angular creep of a gyro wheel at any latitude is given by this formula: t/4 * sin(lat) ; t in mins. Therefore, the mean course of the torpedo will be: t/8 * sin(lat) (degrees)". I'm guessing that the guidance control of the gyro results in a reduction in the drift by 1/2 but cannot find reference to the angular creep of a gyro wheel equation and its corollary for course. Any thoughts?
Date: 30 September 2014
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