Manual targeting

[teg916]

So I was practicing my targeting and I seem to be able to do fairly well with manual targeting in good weather. However in bad weather I seem to do a horrible job of measuring the range to my target. I was using the attack periscope to measure the range and I kept getting a range that was way off. Like 1600 Meters when it is actually about 900 meters.

I was using the weapons officer to determine how far off I was by making my own solution, then asking him for a firing solution and comparing the numbers so I had an idea of how far off I was.

Any tips for a good way to get the range to the target in bad weather?

[TigerShark808]

I'm a few months into this manual targeting...and i have played this game for almost 3 years.

Weather and wind will play havoc on you.

Dont give up!

[sharkbit]

If you can, set your sub up on a course perpindicular to your target's course and set your scope/UZO to where the gyro angle reads 000 and shoot when the area of your target you want to hit is lined up with the vertical crosshair.

Range is not a factor with a 0 gyro angle and a perpindicular course.

This assumes you have target speed and the AOB set correctly on the TDC.

See this link for the quick 90 method(if you haven't seen it already):
http://www.paulwasserman.net/SHIII/



Oh yeah:
Welcome aboard!

[Melonfish]

aye even in bad weather i seem to be hitting as long as i'm on a rough 90° aob.
remember you don't need range to calc speed just time how long he takes to get between a coupld of points and calc on the nemograph

[teg916]

I am confused.

Wouldn't the range to target change the gyro angle of the computer? If I shoot at a ship at a 90 degree AOB from 1000 meters away wouldn't the torpedo have to lead the ship more than if I am 500 meters away?

Or is there something I am missing?

[JMV]

TORPEDO LEAD ANGLE

================================================== ==

Lead Angle = Arctan ( Target speed / Torpedo speed)

So if the target is making 12 knots, and you wish to fire a 30 knot T-III electric, then your lead angle is...

Lead Angle = Arctan ( 12 / 30 ) = 21.8 degrees

As long as you're within 5000 metres of the target track.

Another way to figure how much to lead 'em is via the Law of Sines, i.e.,

arcsin ( sin AOB ( Target speed / Torp speed ))

if AOB = 90; Target speed = 25; and Torp speed = 40, then Offset Angle of Collision (OAC) = 39 degrees

[sharkbit]

Originally Posted by teg916

I am confused.

Wouldn't the range to target change the gyro angle of the computer? If I shoot at a ship at a 90 degree AOB from 1000 meters away wouldn't the torpedo have to lead the ship more than if I am 500 meters away?

Or is there something I am missing?

Nope.
Try it. Set your scope at 000 gyro angle, go to the TDC, adjust the range. The gyro angle should stay the same.

There's a thread somewhere that shows this graphically. I'll see if I can find it, but not until tomorrow probably.

[sharkbit]

Sorry-I couldn't find that diagram that shows this idea graphically.

It basically showed 2 ships on parallel courses at different ranges at time of firing and your sub/torpedo perpindicular to their courses.
The computed lead angle was the same for both ships, even though the ships are at a different range(assuming their speeds are the same).

All this can be figured with some trig or make a cool wizwheel-Hitman makes a cool one.
http://www.subsim.com/radioroom/show...t=kriegsmarine

[teg916]

Ok, that makes More sense. I didn't understand how to get the lead angle. Thanks

[derrinurban]

I do the same sort of thing, but just made a chart for the different torpedo speeds. Since torpedo speed and target speed are constants, the shooting angle works for any distance.




http://img31.imageshack.us/img31/798...romthehip1.jpg

DU

[JMV]

Sharkbit : I think I found it . You're probably refering to thin post :

http://www.subsim.com/radioroom//sho...d.php?t=138312

It's SH4, but it does'nt really matter. See graphics at # 8 and 15.

[sharkbit]

Originally Posted by JMV

Sharkbit : I think I found it . You're probably refering to thin post :

http://www.subsim.com/radioroom//sho...d.php?t=138312

It's SH4, but it does'nt really matter. See graphics at # 8 and 15.

THAT'S IT!!!!

Post #15 was the one sticking in my head.

Thanks JMV!

[Bosje]

and at close range (around 1 kilometer) when the ship runs more or less perpendicular across your stern or bow, this trick also applies:

set all torpedo data to 0 so that it fires exactly on you bearing. fast torpedo leads by target speed in degrees, slow torpedo leads by the target speed x2

a destroyer, for example, crossing your bow at 15 knots after its attack run, needs a fast running torpedo aimed 15 degrees in front of her

this is what I always use when I am inside a convoy and the poo hits the proverbial propellor

edit: ah there is a list of lead angles on that link above. never mind (although I find my numbers are close enough to kill stuff)

You can get away with that if your making a straight on bow or stern shot but, when making a 90 degree shot (Target at 090 R or 270 R) you have to get the correct range.