Bothersome
04-16-10, 12:13 AM
I'm lazy and don't really like to bother with all the lines and circles. So I need a method to get me close enough. So check me if you think it off.
OK here is my system for a quick 90 degree attack.
Example: Hydrophone contact at 50 degrees starboard. My current heading is 280.
Step:
1. Turn boat directly to target till hydrophone says target is at 0, set speed to ahead full and wait 5 minutes.
2. If target is going positive (>0) then turn boat 20 degrees starboard. Else if negative turn boat 20 degrees port.
3. Take new bearing and then wait 5 minutes.
4. Take new bearing and if bearing is changing towards your bow (0 degrees) then turn another 20 degrees away from your target and go to step 3 again. If bearing is going more towards your 90 or 270 then turn 10 degrees toward your target.
5. Take new bearing and then wait 3 minutes.
6. Take new bearing and if bearing is changing towards your bow (0 degrees) then turn 10 degrees away from your target and go to step 5 again. If bearing is going more towards your 90 or 270 then turn 5 degrees toward your target.
Last condition, at any time above, bearing to target is not changing then you are on the intercept course.
If target is at your 0 or very close, then you should turn 90 degrees and reverse engines a bit to get away from target course line for your comfortable firing distance.
For targets that didn't come directly ahead. When target gets close enough to keep lock on the periscope turn (90 - degrees to target) away from target and all engines stop. If you feel a little too close to the firing line, then back away some.
You can calculate target speed by using the periscope line. Be at full stop and count the seconds it takes your target to cross the line from bow to stern. Look in the recognition manual to get the length of the target. Use the formula ( length in meters / seconds * 1.944 ) to get knots. Program into TDC and fire.
OK here is my system for a quick 90 degree attack.
Example: Hydrophone contact at 50 degrees starboard. My current heading is 280.
Step:
1. Turn boat directly to target till hydrophone says target is at 0, set speed to ahead full and wait 5 minutes.
2. If target is going positive (>0) then turn boat 20 degrees starboard. Else if negative turn boat 20 degrees port.
3. Take new bearing and then wait 5 minutes.
4. Take new bearing and if bearing is changing towards your bow (0 degrees) then turn another 20 degrees away from your target and go to step 3 again. If bearing is going more towards your 90 or 270 then turn 10 degrees toward your target.
5. Take new bearing and then wait 3 minutes.
6. Take new bearing and if bearing is changing towards your bow (0 degrees) then turn 10 degrees away from your target and go to step 5 again. If bearing is going more towards your 90 or 270 then turn 5 degrees toward your target.
Last condition, at any time above, bearing to target is not changing then you are on the intercept course.
If target is at your 0 or very close, then you should turn 90 degrees and reverse engines a bit to get away from target course line for your comfortable firing distance.
For targets that didn't come directly ahead. When target gets close enough to keep lock on the periscope turn (90 - degrees to target) away from target and all engines stop. If you feel a little too close to the firing line, then back away some.
You can calculate target speed by using the periscope line. Be at full stop and count the seconds it takes your target to cross the line from bow to stern. Look in the recognition manual to get the length of the target. Use the formula ( length in meters / seconds * 1.944 ) to get knots. Program into TDC and fire.