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Originally Posted by aaronblood
Sorry... I cut the 70° in half to 35° I guess I should've cut the 20° in half too.
(and I'm just gonna claim stupidity for saying 35.5° is half of 70°) 
Assuming you're on a 45° track to the target TC and you just set AoB as 35° you should be able to get a +-5° solution (close enough to zero) at the 10° bearing. You would set the target speed for whatever the target speed is and let the TDC calc the +-5 track. Just leave distance at ohhh... 1000-1500 or so and you should be fine.
When I suggested a 20° approximation for the 90° approach angle I was assuming you were going to use your TDC to get an exact track solution (but close enough to zero gyro) to hit anything inside of 2000 yds (maybe further).
I haven't tested it, but I would think that a +-5 gyro angle wouldn't introduce enough error to miss inside of 2000yds. It's only the little bit of torpedo advance that skews the solution with regard to distance, and I doubt a few degrees is gonna matter too much if I just set a 1500yd distance and forget about it. |
Right, I see what you mean, that works great for ranges of about 1,500 yards as you say. It's a great method for close in attack, nice and easy and should give you results. Certain factors come into play when you are using it for longer ranges though and that's what this method is for - just an all round method that works. Some may not like drawing a little diagram, others may prefer it. I prefer to use the TDC in full PK mode, but each to our own.
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Originally Posted by aaronblood
So you're on a 45° track and target is moving at 12kts.
Try setting aiming wire at 10° and AoB 35°, speed 12 and MARK (hit input button). That should give a solution close to zero gyro. Now fire as points of interest pass the wire on the 10° mark.
I was just looking for ways to simplify the TDC data entry and allow the TDC to solve for the angle... similar to Fast-90. Notice the only variable above is speed, I don't need to keep a lookup table of degrees for zero gyro shots.
But it's up to you all if you want to do the math, if you like super precision and hitting targets at 8000 yards that's fine too. 
10 and 35 seem to work OK for a 46kt torpedo... and what's the other torp speed? ...probably close enough for other speeds too. |
That makes more sense, thanks for clarifying. It does work for close in ranges of around 2,000 and under. The other torpedo speed for the mk.14 is 31 kts. The mk.18 is 29 kts
and the Mk.10 is 36 kts.
The Dick O'Kane method works for close in targets, but has certain things removed from the target problem that become apparent when shooting at longer ranges. The first is that you need to put a range into the TDC and for most bearings, this means a small gyro angle. A large gyro angle, as we know needs very precise range data to score a hit and setting a solution for 1,500 yards for a target 4,500 yards away will mean a significant range error. The gyro angle is further exagertaed, as the reach on a mk. 14 is 200 or so yards, so for a target 1,500 yards away, the gyro angle is calculated for a run of 1,300 yards. This increases the gyro angle and increases the error set for the gyro angle. For such range errors, even a small gyro angle will result in a miss at longer ranges.
The second problem the static PK has is the AoB of the target and rnage aren't adjusted, as you close on the target's track, the AoB will also change and that not being updated adds a small error into the gyro angle already calculated. This effect is reduced if coming on for a slow creeping submerged attack, but is noticable with a high speed surface attack. Errors are introduced here into the firing soilution you have. The target's own movement is also taken into account when closing on a track.
These errors sometimes cancel each other out and sometimes they compound each other.