Fast 90 Attack tutorial for Wolfpack

[JuanLiquid]

Maybe I didn't understand it right.

But once you know speed and course (aob), it should be as easy as aim with the attack periscope to the ship, place speed&aob in the TDC, and a estimated range (very rought one, by eye) and fire.

I don't see any advantage using this method. In fact it is very uncomfortable if you are targetting multiple ships which are sharing speed&heading

Could someone explain it further? Why is it better than classic method?

[Pisces]

It is almost the same as you do, except that by turning the heading/bearing dial until the torpedo gyro angle shows 0, you take range out of the equation. As it is only needed to correct for the straight and then curved path the torpedo takes after leaving the tube. Range is also needed to calculate the spread for a salvo on a target of certain length. But if you want to fire single shots then range is no longer a factor if torpedoes move out straight ahead.

When positioned perpendicular across the target track you get the best benefit of their broadside showing the largest angle to hit into. Less chance of a miss compared to bow-on or stern-on shots. You can orient the uboat to be off from perpendicular if you wish, but then it is best to set the AOB off as much from 90 degrees as you are from perpendicular. AOB is less than 90 if you are oriented towards the oncoming targets, and AOB should be more then 90 if you are slightly oriented towards the target course.

Once you know the target course it becomes 'easy' to position yourself ahead perpendicular of the approaching convoy. Waiting to become in-line with the first (or any) row of the convoy. With the speed, AOB and the periscope set to the lead angle (set according to those Fast 90 steps) then the TDC will be prepared to fire the torpedoes. Only differences maybe the particular torpedo depth required for a particular tube intended for a target.

The member on the furthest column in that row will pass the periscope line ( set to the leading angle) first. Don't turn the scope or it will cause the torpedos to turn to the non-zero gyro angle. Fire when it is centered on the line by it's own movement. And wait after switching to the second tube (with perhaps a different depth). Now the second-from-furthest column member will approach the line first. Again, wait for the 2nd target to be centered on the line by means of it's own movement, then fire. And so on for up to 4 column targets with your 4 tubes. The nearest one as last.

And eventually this will happen (if every thing is set up correctly).

edit: Guzz01's guide on steam explains virtually the same setup.

[gutted]

I made that .gif like 10 years ago.

[Pisces]

Ok, sorry. I didn't know who made it. Probably grabbed it through one of Rockin Robbins message.

[JuanLiquid]

Thank you for the in-depth explanation!!!

[gumbeauregard]

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.

[kaptnkrunch]

"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!

[Aktungbby]

kaptnkrunch!

[PeterS]

Originally Posted by kaptnkrunch

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).