Quote:
Originally Posted by kraszus
surely a ship with an AOB of 45 will pass through the scope more quickly than a ship with AOB 90 at same range?
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No it won't - and in this lies the beauty of this method:
In this example, two captains are calculating speed of the ship. Kaleun A is at more or less 90 AOB, Kaleun B at much narrower angle. Both place centerline of their scopes at bow of the target and wait until ship passes its entire length as seen through the scope.
As you can see, while distance traveled by the ship will appear shorter for Kaleun B, the
apparent movement of the ship will be slower for B as well. For both observers, ship will take the same time to cover known distance (ship's own length in this case).
Thus, you can use this method to calculate speed at any AOB other than 0.