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gumbeauregard · 08-28-17, 01:40 AM

Here is a film of my Zero Gyro Angle attack method.

Notes:

If you take positions every three minutes the yards moved divided by 100 =knots of speed for the target. You will see a series of 3 minute positions showing 1000 yards each interval for a target speed of 10 knots.

All bow torpedoes are set to run at 46 knots. The old Mark 14's must be set to high to do this (Tubes 1 through 4) Tubes 5 and 6 have Mark 23's which only have the 46 knot speed setting.

Deflection angle for 10 knot target with 46 knot torpedo can be found on the Wiki chart
https://en.wikipedia.org/wiki/Torped...ctionAngle.png

Or you can use this calculator
http://www.couscouscrabcakes.com/okane.html

Or you can make your own table of values in Excel using =DEGREES(ATAN Target Speed/Torpedo Speed)

Notice there is no need to put anything into the TDC with this method.

Once I know the target speed all I do is get to my shooting position, 1000 yards or less from target track and 100 degrees Torpedo track angle (The angle formed by the target track and the torpedo track)

The calculated firing bearing in the film is 12 degrees starboard which is a bearing of 12 degrees. If the target where approaching from submarine port side (Starboard AOB) the firing bearing would be 12 degrees port or 348 degrees.

Range is unnecessary for this method as the ratio of the target speed to torpedo speed remains the same, thus the angle does not change with range to target.

08-28-17, 01:40 AM	#15
gumbeauregard Seaman Join Date: Feb 2008 Location: Houston, Texas Posts: 41 Downloads: 16 Uploads: 0	Here is a film of my Zero Gyro Angle attack method. Notes: If you take positions every three minutes the yards moved divided by 100 =knots of speed for the target. You will see a series of 3 minute positions showing 1000 yards each interval for a target speed of 10 knots. All bow torpedoes are set to run at 46 knots. The old Mark 14's must be set to high to do this (Tubes 1 through 4) Tubes 5 and 6 have Mark 23's which only have the 46 knot speed setting. Deflection angle for 10 knot target with 46 knot torpedo can be found on the Wiki chart https://en.wikipedia.org/wiki/Torped...ctionAngle.png Or you can use this calculator http://www.couscouscrabcakes.com/okane.html Or you can make your own table of values in Excel using =DEGREES(ATAN Target Speed/Torpedo Speed) Notice there is no need to put anything into the TDC with this method. Once I know the target speed all I do is get to my shooting position, 1000 yards or less from target track and 100 degrees Torpedo track angle (The angle formed by the target track and the torpedo track) The calculated firing bearing in the film is 12 degrees starboard which is a bearing of 12 degrees. If the target where approaching from submarine port side (Starboard AOB) the firing bearing would be 12 degrees port or 348 degrees. Range is unnecessary for this method as the ratio of the target speed to torpedo speed remains the same, thus the angle does not change with range to target.