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gentoowally
02-26-2007, 10:50 AM
Hi,

When using the "Fast 90 Basic" Manual Targeting method do you have to wait for the target to be at 000 in the scope/UZO when you fire?

Thx,
Wally

gentoowally
02-26-2007, 10:50 AM
Hi,

When using the "Fast 90 Basic" Manual Targeting method do you have to wait for the target to be at 000 in the scope/UZO when you fire?

Thx,
Wally

aaronblood
02-26-2007, 04:41 PM
NO! That would actually be too long to wait.

Fast-90 is a very simple (and yes fast!) way to calibrate the TDC for firing.

There's a really painfully simple way to remember how to always calibrate the TDC properly with fast-90.

Let's suppose your sub is in position well ahead of the projected target's path. That would be 90? abeam of the target path at about 700m-1000m.

Setup your fast 90 inputs as follows:

1. Set scope or UZO at 0?

2. Goto TDC and make sure it's locked and reflects your scope bearing of 0?.

3. Unlock the TDC and set appropriate distance & speed for target. (The distance is NOT the distance to the actual target! It's the distance to the intercept of the target's projected path.)

4. Set AoB as either 90? port or starboard

5. Lock TDC and your done!

The easy way to remember if your AoB input is correct is that the AoB arrow on the TDC should point in the same direction as the target's movement relative to your sub.

For instance... suppose your target is approaching from the starboard (right) side. The arrow on the AoB input would point left, same direction as the bow of the target is pointing relative to your sub.

Works the same way if you're setting up a stern tube shot. The AoB arrow always points in the direction the ship is traveling relative to your point of view.

What then would be the perfect time to fire?

Assuming again your target is approaching from the right, if you've setup a fast-90 attack solution properly, you should see a torpedo path on the TDC that bends about 10-20? to the left if your scope is set at 0?.

If you increment the scope to the right 5-10? at a time and check the torpedo path on the TDC you should notice it start to straighten out.

The perfect shot would be a zero gyro angle (a straight line). You should get a straight line on most targets at about the 20? or 340? mark for a forward tube depending on whether the target approaches from right or left.

Therefore, if you're at 1000m abeam the target path, target speed is 6kts and approaching from the right. Your optimum firing point is when the targeted area of the ship is at the 15-20? degree mark.

You're always trying to...
1. minimize gyro angle!
2. torp impact at as close to 90? angle as possible

The best part of fast-90 is that if you're abeam of a convoy's path, you only have to calibrate the TDC once and you can fire at multiple targets in tandem formation.

It's fun to shoot at two ships in tandem formation and time it so both torpedos hit at almost the same time!

Good luck, and good hunting!

Kaleun1961
02-26-2007, 05:38 PM
And when it works, this is what it [simultaneous hits] looks like:

http://i13.photobucket.com/albums/a299/K-61/BB%20Taskforce/TF015.jpg