Stadimeter & range estimates....Choppy Waters! - Page 2

Heibges · 04-12-06, 09:00 PM

That's right I'm sorry. I meant perpendicular course, bearing 0Â°, AoB 90Â°. You are using the MILS method also, which we were discussing above. Do you have a complete chart for this? I had one which I had scibbled in a notebook, which got thrown away before I could put it on the computer. I haven't gone on patrol in a while because I need to redo the chart before I do.

The one problem I have , and something that is very realistic and really hampered the uboat effort, is that in poor visibility I might not have 3:15 of visibility time. Also, being submerged, I am at the mercy of the convoy if they change course.

It's easy to see why the uboats were so much more successful on the surface than at PD.

I'm sure kalues did have extensive combat tables, similiar to what an artillery unit would have.

Sawdust · 04-12-06, 09:58 PM

Quote:

Originally Posted by Heibges

The one problem I have , and something that is very realistic and really hampered the uboat effort, is that in poor visibility I might not have 3:15 of visibility time.

I've switched to estimating the speed of the ship by only waiting half of the time of 3:14, that is 1:37 (because of impatience rather than lack of visibility time

) Just double the result to get the same answer. So far, the extra inaccuracy has been OK, but I am using automatic map updates which makes it easier.
I suppose one could get a really rough guess of target speed by halving the time again (and again? :hmm: )

Is there any chance in SHIII of estimating a ship's speed by the size of its bow spray? That would be cool.

Keelbuster · 04-12-06, 10:02 PM

the quality of your estimate should increase with time! If you keep halving it, eventually you'll have noise!

Kb

don1reed · 04-13-06, 08:48 AM

Ships length past the vertical graticule / seconds x (3600/1852) = speed.

caveat: ship AOB should be between 60 & 120Â°, and the sub setting still or No faster than 1 kn.

i.e., T2 = 152.7m / 40 sec. x 1.94 = 7.4 kn.

I never worry about 'range' if the target fills half the scope @ x6 it's close enough for a kill. Speed & AOB are the only things of concern.

jasonb885 · 04-13-06, 10:30 AM

Quote:

Originally Posted by don1reed

Ships length past the vertical graticule / seconds x (3600/1852) = speed.

caveat: ship AOB should be between 60 & 120Â°, and the sub setting still or No faster than 1 kn.

i.e., T2 = 152.7m / 40 sec. x 1.94 = 7.4 kn.

I never worry about 'range' if the target fills half the scope @ x6 it's close enough for a kill. Speed & AOB are the only things of concern.

I should've written all this down last April when these kinds of questions were more common.

Thanks for posting on this! (Again?)

greyrider · 04-13-06, 01:52 PM

jason, one decree is equal to 17.7 mils.

if you saw the GTA (graphic training aid) that i put as a pic in the tread sh3 grid protractor, you will see a square protractor, i and many use for indirect fire, and land navigation.

the outside edge is in mils, there are 6400 mils in a 360 decree circle.

there are 360 decrees in a circle.

the math to find how many mils in one decree is,

6400 / 360 = 17.7 mils.

check this out.

http://www.maptools.com/products/UTMGrids.html

using mils is alot more accurate and precise than decrees.

04-12-06, 09:00 PM	#1
Heibges Sea Lord Join Date: Feb 2004 Location: San Francisco, California Posts: 1,633 Downloads: 1 Uploads: 0	That's right I'm sorry. I meant perpendicular course, bearing 0Â°, AoB 90Â°. You are using the MILS method also, which we were discussing above. Do you have a complete chart for this? I had one which I had scibbled in a notebook, which got thrown away before I could put it on the computer. I haven't gone on patrol in a while because I need to redo the chart before I do. The one problem I have , and something that is very realistic and really hampered the uboat effort, is that in poor visibility I might not have 3:15 of visibility time. Also, being submerged, I am at the mercy of the convoy if they change course. It's easy to see why the uboats were so much more successful on the surface than at PD. I'm sure kalues did have extensive combat tables, similiar to what an artillery unit would have. __________________ U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface. http://www.hackworth.com/

04-12-06, 10:02 PM	#3
Keelbuster Ace of the Deep Join Date: Oct 2005 Location: BA 72 Posts: 1,092 Downloads: 43 Uploads: 0	the quality of your estimate should increase with time! If you keep halving it, eventually you'll have noise! Kb __________________

04-13-06, 08:48 AM	#4
don1reed Ace of the Deep Join Date: Dec 2004 Location: Valhalla: Silent Generation Posts: 1,149 Downloads: 910 Uploads: 0	Ships length past the vertical graticule / seconds x (3600/1852) = speed. caveat: ship AOB should be between 60 & 120Â°, and the sub setting still or No faster than 1 kn. i.e., T2 = 152.7m / 40 sec. x 1.94 = 7.4 kn. I never worry about 'range' if the target fills half the scope @ x6 it's close enough for a kill. Speed & AOB are the only things of concern. __________________ [SIGPIC][/SIGPIC] During times of universal deceit, telling the truth becomes a revolutionary act. ~ George Orwell

04-13-06, 01:52 PM	#6
greyrider Watch Officer Join Date: Apr 2005 Location: massachusetts Posts: 334 Downloads: 237 Uploads: 0	jason, one decree is equal to 17.7 mils. if you saw the GTA (graphic training aid) that i put as a pic in the tread sh3 grid protractor, you will see a square protractor, i and many use for indirect fire, and land navigation. the outside edge is in mils, there are 6400 mils in a 360 decree circle. there are 360 decrees in a circle. the math to find how many mils in one decree is, 6400 / 360 = 17.7 mils. check this out. http://www.maptools.com/products/UTMGrids.html using mils is alot more accurate and precise than decrees.