im confused with the spread angle

[nattydread]

Does the side marked "left" deflect the torpedo left, or is it a left adjustment in the gyro causing a right deflection?

It just seems odd that turing the guage right puts you in the "left" settings when left is always decreasing...does that make sense?

[Scoochy]

Left aims the torpedo left x degrees.
So if you have a ship passing from right to left, fire a torp, turn dial left a few degrees, fire torp and repeat

This changes the degrees from what is inputed into the tdc. so if you update the bearing with the spread andle added, it will add that also. e.g. You send the bearing of 270 to the tdc and fire, torpedo will aim for the 270 solution. add a spread andle of five degrees and the torpedo will be adjusted for the next shot 265.

[nattydread]

ok, so it is that simple...so the TDC designer just decided to make the guage backwards? Why make use turn the dial to the right to get a left deflection?

[donut]

I use it for shooting escorts,after attack runs,when turning at med/short range.
The correct deflection,will put the fish to them.set depth to shallow,speed to fast.
Good hunting

[Spectre-63]

I'll admit it: I've never been much of a math-whiz and High School was a very long time ago. For every degree of spread, how much difference in the point of impact will it make at, for example, 1000 yards?

[jdski]

You move the dial to the direction you want your torp to travel. It's not backwards. Think of the stationary pointer as the target and the "0" on the dial your torpedo.
If the target is passing from left to right across your bow, and you want to hit towards the stern of the target, you would move the "0" on the dial down (counterclockwise). If the target is passing from right to left across your bow and you want to hit towards the stern of the target, you move the "0" on the dial up (clockwise).
With map updates on you can clearly see what the action of moving the dial does on the attack map and it will make perfect sense to you.

[AVGWarhawk]

I'm a little confused as to the question.:hmm: It does not seem reversed to me. When I dial the spread to the left, that torp will track to the left.

[mr darcy]

I think whats causing the confusion for him is, that for a target moving left to right across your scope you have to turn the spread dial to the left (marked "right") to move your aim to the right and vice versa.

I think if the control was at a seperate station, like i assume it was in reality, the this confusion wouldn't be here.

[nattydread]

I think whats causing the confusion for him is, that for a target moving left to right across your scope you have to turn the spread dial to the left (marked "right") to move your aim to the right and vice versa.

I think if the control was at a seperate station, like i assume it was in reality, the this confusion wouldn't be here.

Exactly, I play on 100% making the attack map useless. I dont check it because i dont have the luxury of time and automation

[Torpex752]

Some good info..it explains the different methods used in WWII, and we can actually use and implement these different spreads. I have in a few shots and it works well to hit a high priority target.


Longitudinal spread. A pattern formed by firing a succession of torpedoes along a practically identical track. The submarine steers a constant course and uses the same periscope and gyro angles, but fires at different points of aim on the same target.
Divergent spread. A fan-like pattern formed by a succession of torpedoes fired at the same point of aim but with gyros set to such angles that torpedoes cross the target track at different points. This is not to be confused with the change in gyro angles necessary to make all torpedoes of a salvo hit the target at the same point.
Parallel spread. A pattern formed by firing torpedoes simultaneously from bow and stern tubes with gyro angles set so that the torpedoes run parallel.This is something i wonder if the DEV's took into account....


Correction for parallax -- An angular correction applied to calculated sight angle in angled shots to compensate for the error due to the separation of the torpedo tube from the periscope. In firing on sound bearings, parallax is the angular correction applied to compensate for the error due to the separation of the torpedo tube from the sound receiving instruments combined algebraically with the angular correction applied to compensate for the error due to the distance between the center of the target ship and the propellers thereof, and the angular correction caused by the movement of the target while the propeller sound is traveling to the sound receivers.
Correction for advance and transfer -- An angular correction applied to a calculated sight angle in angled shots to compensate for the advance and transfer of the torpedo in turning to its final track.Just something to experiment with because as we know the torpedo's do not leave the boat on the same line of sight the periscope is on.

Frank
:cool:

[Spectre-63]

Any math whizzes about to help with this question:

I'll admit it: I've never been much of a math-whiz and High School was a very long time ago. For every degree of spread, how much difference in the point of impact will it make at, for example, 1000 yards?

???

[donut]

Due to:Correction for advance and transfer -- An angular correction applied to a calculated sight angle in angled shots to compensate for the advance and transfer of the torpedo in turning to its final track.To answer Spectre-63's question,aprox.30 ft. @ 1000 yds. I stink:roll:

[nattydread]

I dont worry too much about corrcting for paralax, I set up as close to 90 degress as possible and attempt to fire with minimal gyro angles and minimal relative bearings from 000 (340-020).

[maerean_m]

The spread angle dial was created after the real dial on the US subs. That's exactly what they had.

[Spectre-63]

Thx for the reply, Donut! That helps me figure out what kinda spread to use if I want to hit a specific spot. :)

[Torpex752]

The spread angle dial was created after the real dial on the US subs. That's exactly what they had.

I agree, There's nothing wrong with it.


Frank
:cool:

[Prof]

To answer Spectre-63's question,aprox.30 ft. @ 1000 yds. I stink:roll:Ummm...how did you calculate this?? I get 52.4 feet per degree at 1000 yards.

[Skipbo]

I hope that I'm not repeating something that has already been posted somewhere, but since Spectre-63 asked here's a chart I created ten years or so ago for SHI. There are some notes at the bottom on torpedos in that game and a page of notes on how I used the chart (separate worksheet in the Excel file). This chart is trig based (I left the formulas in the file if anyone is interested) and indicates the effective distance apart that torpedos will be vs. distance to target. As you can see, normally very small offset angles will be used - the SHI manual is way wrong on this topic by the way.

http://dmrtc.net/~jwolford/Gyro%20Offset.htm

This information is posted on SubGuy's website and also on a Polish site as well. SubGuy has several pieces of information posted which should still be useful for SHIV by the way. I originally did the chart and several other technical projects and missions for Jim Atkins to post on his old SilentHunter.com website.

SubGuy's website (he is also a SUBSIM member, but not playing SHIV yet AFAIK):

http://www.enemybeneath.com/



http://dmrtc.net/~jwolford/SHI-Gyro-Offset.jpg

[donut]

Sorry Prof, rough guess,from a rolling deck,& to much SHIV. Need liberty,
Please ,go-figure : to hit at 8,000 yds. use chart. Best guess,
:down: "torp missed sir" PLEASE fix my radar UBI. ,SHI got it right 10 yrs.past!