SUBSIM Radio Room Forums - View Single Post - It's time I finally learn (Manual shooting)

Sniper297 · 02-23-13, 02:16 AM

Yeah, you probably do have angle on the bow confused. What that is, AOB is YOUR position RELATIVE TO HIM, in other words how YOU would be reported if a lookout on the other ship saw you.

I chopped the scope view out to make this smaller. The left side is the main part of the TDC, bottom dial is your sub, top is the target. The inner ring is the relative bearing, which US specified in 360 degrees, Europeans generally used "RED 90" for a 270 degree relative bearing (port beam) and "GREEN 90" for a 90 (starboard beam). The outer circle is the true bearing, relative to the north pole rather than ship's bow.

The arrow pointer in the lower dial is the gyro angle, showing how much the torpedoes would have to turn after being fired - after all you're shooting straight out of the bow or stern tubes, and the fish will run straight for 200 to 300 yards before turning to the heading set for them by the TDC. The pointer arrow on the upper dial shows the angle that the torpedo will strike the target ship assuming no change in target course or speed. Obviously this is far out of range, but the angle on the bow is starboard 105, since his speed is 12 knots the torpedoes are chasing from behind and would hit about 128 degrees.

Here I've turned the sub around to head toward him, note the angle on the bow hasn't changed much, since I haven't moved very much relative to him - if he saw me he would still be looking in approximately the same direction, just a little aft of his starboard beam.

In this shot;

You have a 60 degree gyro angle, in other words the torpedoes have to make a 60 degree right turn after leaving the tubes. Up to 30 degrees is okay if you have to, but the closer you can get to a zero gyro angle shot the better, since the further the fish need to turn the bigger the minor errors get magnified. So in that situation you're much better turning toward the track (or away if it's a stern shot) to get your sub lined up as close to 90 degrees to the target track as you can. Then set the AOB for about 80, and if you're perpendicular to the track it will be about 80 at the time you shoot.

Main reason for all the fooling around with the AOB in the beginning is to figure out his course - the Holy Grail of the attack is to draw his track, draw a perpendicular line 1000 yards off the track, then get there before he does and position yourself 1000 yards off the track facing toward the track at 90 degrees. Then just wait for him to reach the firing position and shoot.

02-23-13, 02:16 AM	#44
Sniper297 The Old Man Join Date: Dec 2005 Location: Philadelphia Shipyard Brig Posts: 1,386 Downloads: 160 Uploads: 19	Yeah, you probably do have angle on the bow confused. What that is, AOB is YOUR position RELATIVE TO HIM, in other words how YOU would be reported if a lookout on the other ship saw you. I chopped the scope view out to make this smaller. The left side is the main part of the TDC, bottom dial is your sub, top is the target. The inner ring is the relative bearing, which US specified in 360 degrees, Europeans generally used "RED 90" for a 270 degree relative bearing (port beam) and "GREEN 90" for a 90 (starboard beam). The outer circle is the true bearing, relative to the north pole rather than ship's bow. The arrow pointer in the lower dial is the gyro angle, showing how much the torpedoes would have to turn after being fired - after all you're shooting straight out of the bow or stern tubes, and the fish will run straight for 200 to 300 yards before turning to the heading set for them by the TDC. The pointer arrow on the upper dial shows the angle that the torpedo will strike the target ship assuming no change in target course or speed. Obviously this is far out of range, but the angle on the bow is starboard 105, since his speed is 12 knots the torpedoes are chasing from behind and would hit about 128 degrees. Here I've turned the sub around to head toward him, note the angle on the bow hasn't changed much, since I haven't moved very much relative to him - if he saw me he would still be looking in approximately the same direction, just a little aft of his starboard beam. In this shot; You have a 60 degree gyro angle, in other words the torpedoes have to make a 60 degree right turn after leaving the tubes. Up to 30 degrees is okay if you have to, but the closer you can get to a zero gyro angle shot the better, since the further the fish need to turn the bigger the minor errors get magnified. So in that situation you're much better turning toward the track (or away if it's a stern shot) to get your sub lined up as close to 90 degrees to the target track as you can. Then set the AOB for about 80, and if you're perpendicular to the track it will be about 80 at the time you shoot. Main reason for all the fooling around with the AOB in the beginning is to figure out his course - the Holy Grail of the attack is to draw his track, draw a perpendicular line 1000 yards off the track, then get there before he does and position yourself 1000 yards off the track facing toward the track at 90 degrees. Then just wait for him to reach the firing position and shoot.