SUBSIM Radio Room Forums - Algebraic Firing Solution

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- Silent Hunter 4: Wolves of the Pacific (https://www.subsim.com/radioroom/forumdisplay.php?f=202)

- - Algebraic Firing Solution (https://www.subsim.com/radioroom/showthread.php?t=200846)

Saba	03-13-15 11:00 AM

This is worthy of a big bump! A sticky even imo.

TorpX

03-14-15 11:22 AM

Thank-you! :subsim:

merc4ulfate

03-14-15 11:30 PM

I just lead the target enough in my head and never do the math. 10 degrees is usually good enough at the ranges I fire from.

sublynx

03-21-15 06:27 AM

I was thinking about using about using the program in SH3 and would need to find out the torpedo distance, reach and radius values for the G7e and G7a torpedoes. Measuring the distances in Attack Map F6 I got these following values.

http://i.imgur.com/XJGpQHj.png

http://i.imgur.com/cVGEylZ.png

They're pretty close to the values for the SH4 torpedoes.

Has anybody figured out working values for SH3?

TorpX

03-23-15 02:03 AM

AFAIK, nobody has tabulated these factors for SH3 torpedoes.

Since the US Mk. 10 and Mk. 14 seemed have identical radii and reach, I thought there was a good chance Ubi made them all the same.

About the reach; you use the expression "distance forward until fully turned". You need to know the distance the torpedo travels before it starts to turn. You also want to know the time lag (what I call the launch lag). This is the time lag for the torpedo to be ejected, and the time lost while the torpedo accelerates to speed.

I didn't have a perfect, or completely satisfactory, method for computing these values. However, you don't need them to be absolutely accurate to get hits.

sublynx

03-23-15 11:24 AM

I see. Thanks :salute:

I'll experiment with the values. It might be that the values are identical in SH3 and SH4. No real reason for the devs to have changed them.

BigWalleye

03-23-15 11:38 AM

My measured values for SH3 are:

Reach - 52 m
Turning radius - 97 m
Launch lag - 2.6 sec
Tube distance (from attack scope)
forward tubes - 25.8 m
aft tube - 36.1 m

Data for the Ti (Typ G7a) torpedo at 44 kts speed setting, firing platform Typ VIIb.

Using these data in Tracking Party 1.1 seems to give good results.

But these are measured data using just the in-game tools for measurement. YMMV!

sublynx

03-31-15 10:19 AM

I found this mention:

A torpedo after leaving the tube and before starting its turn, covered a distance called reach (Germ. gerade Vorlauf), which depended on the torpedo type (types C/06 and G/6 - 10 m, type G/7 - 15 m, type G7a and G7e – 9.5 m). Then it started its turn with a radius that also depended on the torpedo type (type C/06 - 145 m, type G/6 - 100 m, type G/7 - 105 m, type G7a and G7e - 95 m).

from here:

http://www.tvre.org/en/gyro-angled-torpedoes

(I haven't had an opportunity to start using the program yet, so I don't know if the real life values are any good.)

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