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Originally Posted by ColonelSandersLite
I'll go over the rest in more detail later, but I would like to know where you're getting that particular piece of information. It's possible that the stabilization mechanism assumed a standard tactical speed (like maybe 2 knots submerged or something). However, it does not say anywhere that I'm seeing that sub speed is not known to the unit. It does specifically say that it is getting data from the ships gyrocompass, which knows ships speed.
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How gyrocompass knows the ship speed? I have always thought, that it knows only its course. The speed is measured by log.
The periscope manual says:
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The azimuth line is actuated by a self synchronous motor, which in turn is governed by the gyro compass of the submarine. The position of the line is thus independent of changes in the course of the submarine, but if the periscope is rotated in its bearings the azimuth line will of course move against the field.
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Regards
Maciek