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#1 |
Planesman
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Hi all
I am playing SH3 with map updates off so in the nav window I cannot see the target. Does anyone know how to calculate the target course given the following parameters? 1. Relative Bearing to Target 2. My uboat Heading 3. Angle on the Bow (of the target to uboat) So just say 1 = 240 degrees 2 = 90 3 = 60 starboard What is the ships/targets heading ? Regards Shelton.
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#2 |
Ocean Warrior
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EDIT--THESE MATHS ARE WRONG, SEE FURTHER DOWN FOR THE CORRECT SOLUTIONS!
OK, start with your heading. Add the periscope angle. Then add the AOB if it's starboard or subtract the AOB if it's port. E.g.1. your heading 000, periscope angle 090, AOB starboard 90, target course =180 E.g.2 heading 055, scope angle 235, AOB port 25, target course = 055+235-25=290-25=265 In your example, 240, 90,starboard 60, target course =240+90+60=390=030 You can also draw it on the map using the protractor tool But easiest of all is to build yourself a proper KM or US whiz wheel and solve the problem in seconds without ever having to think about it. You can also use it to plot a course that will give you the desired firing position http://www.subsim.com/radioroom/show...ght=whiz+wheel
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill Last edited by joegrundman; 08-24-07 at 10:16 PM. |
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#3 |
Ace of the Deep
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240 + 90 + 60 modulo 360 = 30°
But someone was still faster ![]() For long range calculations you will need a more exact course than you get from rough AoB estimations. So better make observations of the target's position relative to your own ones and mark them on the Nav map. Then you can just read the target's course from there. You can then plan your attack so that the AoB is a very simple one, like 90° See Wazoo's manual plotting tutorial - Fast 90° method (for example). The Wiz Wheel should be the most historically accurate one though. At least for german submarines from that period. |
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#4 |
Subsim Aviator
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i modestly submit my very first tutorial video.
this tutorial video instructs the viewer on how to plot solutions on paper using a ruler and protractor it assumes the player already knows how to gather range to target, and understands headings and bearings view it and PLEASE offer constructive critisism. thanks! http://hosted.filefront.com/GoldenRivet/
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#5 |
Ocean Warrior
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I may have been faster, but i was certainly wrong!
Actually i don't know hot to do it. Just build a whiz wheel. It's much easier ![]()
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill |
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#6 |
Planesman
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Just watched the tutorial video - fantastic!! yes as you mention it becomes very difficult if my uboat is also moving - but i get the general idea - so there isn't a forumale i use to calculate the target course - other than plotting at different times?
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#7 |
Subsim Aviator
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plotting the target's position relative to your boat over time vs doing mathematic formula is probably easier - especially as far as visualisation - is probably easier
it is for me anyhow, of course everyone is different. glad you liked it. plotting the solution either requires a much larger sheet of paper or a much smaller scale on the ruler. but aside from plotting the target's position every couple of minutes you have to plot your own, including any turns you make etc. edit: i should also mention the video only covers bow shots, unless you mark your bearings from 090 through 180 to 270 instead of the way shown (090 to 270 through 360)
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#8 |
Ocean Warrior
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Ok, there is a solution to do it. My wife and i worked this out over pancakes for breakfast.
Unfortunately it's kind of slow. There are four situations you need to determine, and the equation is different for each. 1. AOB is port, and periscope angle is less than 180 Target course = heading + periscope angle + AOB -180 2. AOB is starboard, periscope angle less than 180 Target course = heading + 180 + periscope angle -AOB 3. AOB is port, and periscope angle is greater than 180 Target course = heading + periscope angle + AOB - 180 4. AOB is starboard, and periscope angle is greater than 180 Target course = heading + periscope angle - AOB -180 e.g. heading 240, scope angle 90, AOB starboard 60, use equation 2 240+ 180 + 90 - 60 = 090 Someone please check the solutions, right now i'm a bit surprised that equations 1 and 3 are the same. EDIT - I've tested them and they all seem to be correct But you can see right away why the real submarines used a whiz wheel for this ![]()
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill Last edited by joegrundman; 08-24-07 at 10:19 PM. |
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#9 | |
Planesman
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#10 |
Ocean Warrior
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If you can't be troubled with making your own whiz wheel (I have made three, and the US ISWAS style is my favourite), the good news is that I am working on an electronic version of the KM whiz wheel that would appear in game. It's at a beta level now, it functions but not really well enough. However I am interested in having a playtester that could give me some constructive advice for it.
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill |
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#11 | |
Planesman
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BTW YES your correct - the original equation on my first post - the merchant was indeed travelling 90deg !!!! so I was confused when ichso posted 30!
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#12 | |
Ace of the Deep
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![]() You're manually drawing half of a maneuvering board. You plotted the DRM line (direction of relative motion) and since you mention being stationary you are also correct that it equates to the contact TC (true course). If your sub was moving, you would need to plot a movement vector for your sub and the contact speed and DRM. It's not difficult, I could show you how to do that if you like. |
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#13 | |
Ace of the Deep
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#14 |
Ocean Warrior
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It's analog. it looks and functions more or less like the authentic one. If you PM me your email address I'll send you my WIP
joe
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"Enemy submarines are to be called U-Boats. The term submarine is to be reserved for Allied under water vessels. U-Boats are those dastardly villains who sink our ships, while submarines are those gallant and noble craft which sink theirs." Winston Churchill |
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