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Old 06-01-2019, 07:11 AM   #16
gumbeauregard
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Default No Gyro Angle shots from any AOB

A few years ago when Hurricane Harvey was dumping millions of gallons of water on my roof I spent the inside time doing a couple of videos explaining how the basic firing angle is a simple trigonometry problem revolving around the ratio of the target speed to the torpedo speed.

The TDC in SH4 was not the easiest thing to get to work correctly so I rarely used it and developed this method (actually stole it directly from the guys who did all this for real). A "discussion" with another member who disagreed with this method prompted the videos

I have only fired three torpedoes in Wolfpack but I can see the theory behind this and learning the rules of thumb and having the prepared tables or calculator ready will make an excellent backup method for a quick shot or to confirm TDC setup.

Of course, one has to know torpedo speed as well as target speed or none of this works.

http://www.subsim.com/radioroom/showthread.php?t=233175

The original thread where I got my motivation to develop the two videos.

http://www.subsim.com/radioroom/showthread.php?t=232987

I am very excited about Wolfpack because I love the math behind plotting and executing an attack.

Last edited by gumbeauregard; 06-01-2019 at 07:46 AM.
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Old 07-20-2019, 08:37 PM   #17
kaptnkrunch
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Exclamation Question on fast 90 setup

"Turn your scope to bearing and that is your lead angle"

Well.. I am not sure I am reading the bearing correctly after setting up for fast 90.

There are 2 bearing dials - top one goes from 0-9 , bottom is 0-359

so.. which one am I adjusting the scope to?

Or maybe it's both.. both don't know how to read it properly?

Cheers!
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Old 07-20-2019, 09:18 PM   #18
Aktungbby
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Default welcome aboard!

kaptnkrunch!
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Old 07-20-2019, 11:33 PM   #19
PeterS
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Quote:
Originally Posted by kaptnkrunch View Post
There are 2 bearing dials - top one goes from 0-9 , bottom is 0-359

so.. which one am I adjusting the scope to?
Both dials display the same bearing, you combine them to read the exact bearings.
Lower dial e.g. show "20 plus a little bit", top dial shows "2.4", then the bearing is 22.4

Basically the top dial is just for the last digit plus the first position after decimal point, which would be impossible to read from the lower dial alone.

Just look at the scope bearing, which allows you to see the last digit (but not the exact first position after decimal point) and compare to what you see on the TDC, so you should get a grasp of it quickly.

The first position after decimal point is somewhat irrelevant for setting the AOB (just round it), but can be useful for calculations for e.g. "Auswanderungsverfahren" (whatever that's called in English, don't know).
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Old 07-21-2019, 09:07 AM   #20
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Danke PeterS!
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Old 07-21-2019, 09:24 AM   #21
derstosstrupp
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Auswanderungsverfahren = bearing change method!
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Old 07-22-2019, 12:38 AM   #22
gumbeauregard
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No need to guess the firing bearing. If you know the target speed, the firing angle does not change. All you need to decide is periscope left or right of 0. Look it up on the chart and set the periscope accordingly to generate Zero Gyro Angle,

Example: The target is doing 12 knots with 90 Starboard Angle on the Bow.

Firing Angle is 22 degrees. Note that firing angle and firing bearing are the same for Port AOB shots.

For Starboard AOB, subtract firing angle (22 in this case) from 360 to get the firing bearing of 338.

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Old 09-08-2019, 05:07 PM   #23
Jonas Grumby
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Default Fast 90

Quote:
Originally Posted by gutted View Post
Approach from 90 degrees. Set scope to 0, set 90 AOB (port or starboard), input speed, ignore range. Swivel scope until the gyro reads 0 and thats your shoot point. It's not hard.

The only difference with this game is that you can't actually see the gyro while in the scope. So you have to disable the TDC from the scope then move the heading dial on the TDC (which should really be labeled bearing) until you find the bearing that zero gyro is on, then re-slave it to the scope and put the scope on that bearing. Or just have the man on the TDC tell you when the you are on the zero gyro.
Thank you. Did not realize someone replied to my comment.
I have the Fast 90/O'kane method well in hand now for Wolfpack.
Very easy. It also has the added benefit of making it easier to gauge the convoy speed by using only one of the escorts. In my opinion, it is MUCH easier to identify an escort for my speed determination than it is to identify a merchant. Sometimes the merchants can be tricky when they are massed together and the masts and kingposts get jumbled together.
I've been sinking ships at will while surfaced by myself quite successfully with this method.
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