Originally Posted by jmr

Is the C2 doing 4 knots? I enabled auto targeting just for testing purposes and it reported the C2's speed at 2 knts. I think the ships in the torpedo academy mission will pick up speed and start zig zagging if they spot you or your torpedoes wake. Maybe that's what happened?

Originally Posted by ronbrewer

Thanks. This is definitely a procedure worthy of either a sticky in the forum or included in an FAQ for the game. Really good work putting it all together.

One other thing that I wasn't sure about was the reason the second observation was reported in yards (4000 yards) when the first observation was done without a units descriptor (7000). I'm going to use this with SH3 when the slide rule arrives that I got off of eBay. Can the yards reference on the second observation be ignored when using a U-boat or will that change things later on in the procedure?

Thanks,
Ron

Originally Posted by don1reed

A pic is worth 1000 words:

The center of the maneuvering board (mobo) is the sub/uboat. Let every ring = 200m so that the outter ring is 2000m from the sub.

http://img68.imageshack.us/img68/5664/amobocu1.th.jpg

Math:

1852m / 3600s = .51 (constant). 1/.51 = 1.96 (constant)

When the answer is in meter per second we can either multiply by 1.96 or divide by .51 to get knots.

therefore,

2.3 mps / .51 = 4.5 knots.

A line drawn from m2 (target) to the sub, subtending from DRM (direction of relative movement) = AoB 112°. 180° - 112° = 68° for sliderule use.

Mobo is handmade 1 cm rings total 10 rings.

Another way to test the speed of your known C2 is to clock the movement of the ship as it passes the center stationary reticule of the scope. End the timing when the stern passes.

Math: Known Length of ship in meters / time in seconds X 1.96 = ship speed in knots.

more math:

Imperial: 2026 yds. / 3600 s = .56 (constant). 1/.56 = 1.78 (constant). Either divide yds. per second by .56 or multiply by 1.78 to get speed in knots.

@Bill: Your initial instructions on p1 are in order.

Originally Posted by don1reed

@Bill:

http://img147.imageshack.us/img147/734/amobo1fn8.th.jpg

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.

Originally Posted by Spin Doctor

Lots of good hard to find information here. Should probably be a sticky, hmm?