Slide Rule Targeting for SHIII/SHIV

don1reed · 04-27-07, 09:11 AM

@Bill:

I've placed your observations onto a moboard.

As you can see, I've labeled your sightings M1 thru M4, and in the legend are listed ranges & bearings. Just using a moboard, a pair of dividers, and a mm scale, I've plotted the distances travelled between the sightings; between m1 & m2 = 293m; betw m2 & m3 = 380m; and, betw m3 & m4 160m. What makes using the moboard very easy with this solution is because the sub/Uboat is stationary.

Clearly, it is seen that the distance travelled between m3 & m4 is greatly reduced due to the hit it suffered during your first attack. It is slowing down.

What I'm not sure about, is when you began to time the target for the second attack (?)

If you began timing when the ship was at M3 and finished at M4, it computes to 160m made good in 195 seconds = 1.6 knots. Let me know...at any rate the ship's skipper has changed course and presented a very narrow target for you to hit.

04-27-07, 09:11 AM	#19
don1reed Ace of the Deep Join Date: Dec 2004 Location: Valhalla: Silent Generation Posts: 1,149 Downloads: 910 Uploads: 0	@Bill: I've placed your observations onto a moboard. As you can see, I've labeled your sightings M1 thru M4, and in the legend are listed ranges & bearings. Just using a moboard, a pair of dividers, and a mm scale, I've plotted the distances travelled between the sightings; between m1 & m2 = 293m; betw m2 & m3 = 380m; and, betw m3 & m4 160m. What makes using the moboard very easy with this solution is because the sub/Uboat is stationary. Clearly, it is seen that the distance travelled between m3 & m4 is greatly reduced due to the hit it suffered during your first attack. It is slowing down. What I'm not sure about, is when you began to time the target for the second attack (?) If you began timing when the ship was at M3 and finished at M4, it computes to 160m made good in 195 seconds = 1.6 knots. Let me know...at any rate the ship's skipper has changed course and presented a very narrow target for you to hit. __________________ [SIGPIC][/SIGPIC] During times of universal deceit, telling the truth becomes a revolutionary act. ~ George Orwell Last edited by don1reed; 04-27-07 at 09:35 AM.