HELP

[derstosstrupp]

Originally Posted by Pisces

Meh, his AoB across the torpedo speed, then the lead angle is across the target speed. When you assume the AOB is 90 in perpendicular setupo then this is close enough.

Well, say the target speed is 15 kn, shooting a 30 knot torpedo. If you just assume 90 AOB for a perpendicular setup, that is going to give you a lead angle of 30. When in reality using the correct formula for a perpendicular lead angle, yields 26.6. That’s a big difference depending on the range.

There are times when “close enough” is fine, but unless somebody is told that close enough only applies at close range, they would be led astray.

Also easily solvable using vector analysis. Using the fact pattern above, draw a line on the map 30 km long straight up. Draw a line going from the top end of that line but perpendicular, 15 km long. Now draw the third leg of the triangle and measure the angle at the bottom, your lead angle. Allows you to quickly figure out your lead angle for any desired track angle.

[Pisces]

Originally Posted by derstosstrupp

Well, say the target speed is 15 kn, shooting a 30 knot torpedo. If you just assume 90 AOB for a perpendicular setup, that is going to give you a lead angle of 30. When in reality using the correct formula for a perpendicular lead angle, yields 26.6. That’s a big difference depending on the range.

There are times when “close enough” is fine, but unless somebody is told that close enough only applies at close range, they would be led astray.

Also easily solvable using vector analysis. Using the fact pattern above, draw a line on the map 30 km long straight up. Draw a line going from the top end of that line but perpendicular, 15 km long. Now draw the third leg of the triangle and measure the angle at the bottom, your lead angle. Allows you to quickly figure out your lead angle for any desired track angle.

Ok, but you can iteratively approximate it more accurately with repeated steps.

Assume AOB =90 ; Torpedo speed is 30 kts ; Target speed is 15 kts. > Leadangle =30

That means the AOB at firing time should be 60 instead. So align torpedo speed to angle 60: Now lead angle becomes 25.5 degrees for 15kts target speed.

That means the AOB at firing time should be 64.5 instead. So align torpedo speed to angle 64.5: Now lead angle becomes 26.75 for 15kts target speed.

That means the AOB at firing time should be 63.23 instead. So align torpedospeed to angle 63.25: Now lead angle becomes 26.5 for 15 kts target speed.

That means the AOB at firing time should be 63.5 instead. So align torpedo speed to angle 63.5: Now lead angle becomes very close to 26.5 again. No need to continue now. (I did this on my handheld template Attackdisk, reading and disk setting accuracy is getting the better of you beyond this point.)

[derstosstrupp]

Oh no I understand that, hence why I said it’s a little more of a laborious process. If it had a tan scale, would be easier. Ultimately the easiest I find if not wanting to use a calculator is vector analysis.

[John Pancoast]

Math, smath Once I know the target speed and I'm at 90 degrees to it, I just zero the uzo/scope, put the target course direction (port/starboard) in the tdc and sink it.
Beats my head exploding anyway.