Quote:
Originally Posted by TorpX
Speaking of Q & D, in WAR IN THE BOATS, the author mentions using a rule of thumb, "speed plus three". It certainly has the advantage of being simple, but I haven't tried it. 
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Captain Ruhe wins the kewpie doll! For a straight shot, his rule-of-thumb is within one degree of the calculated result from 7 to 20 kts target speed. Agrees with SLM-1 up to 16 kts, too. Embarrassing (to me, anyway) but typical. We have been wrestling with this problem to find a correct analytical solution, applying the trig we learned years ago like this was a physics lab problem. But the guy with the eye at the periscope used a much simpler approach that, in the real world of a sub in combat probably worked just as well. I used to do engineering work for the Air Force. The fighter jocks would pull stuff like this, too.