LST-325 Fire Control

LST-325 Fire Control

Joined: March 10th, 2007, 3:06 am

March 6th, 2009, 6:26 pm #1

Does anyone know if the two 40mm sky fire control systems, fore and aft, are for the twin 40's only, or could they, in times past, engage the single 40's as well? As a former Gunner's Mate I was not that familiar with fire control systems other than react to the command, "match pointers and shift to auto."
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Joined: January 17th, 2006, 3:42 am

March 6th, 2009, 6:54 pm #2

Bob, I have asked that question many times of WW11 servicemen who operated the 40MM.

Everyone of them stated they controlled the twinn 40's only.

I have been told both ways but respect the answers from the guys who fired them.

Another factor you may want to consider, all of the single 40's have directors on them thus they didn't need to be directed by a central director.

You wouldn't want all guns firing in the same direction if planes were coming in from behind you while all guns were firing ahead of you.


LH
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Joined: March 10th, 2007, 3:06 am

March 6th, 2009, 8:57 pm #3

Logical deduction. Thanks!
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Joined: December 17th, 2005, 10:55 pm

March 6th, 2009, 9:08 pm #4

Does anyone know if the two 40mm sky fire control systems, fore and aft, are for the twin 40's only, or could they, in times past, engage the single 40's as well? As a former Gunner's Mate I was not that familiar with fire control systems other than react to the command, "match pointers and shift to auto."
Here is a good paper on how the Mk14/51 worked.

http://navweaps.com/index_tech/tech-049.htm
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Joined: March 10th, 2007, 3:06 am

March 6th, 2009, 10:05 pm #5

As Elvis would say, "Thank you, thank you very much." Speaking of Elvis, if the world were fair, Elvis would still be alive and all the impersonators would be dead!
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Joined: October 10th, 2005, 8:42 pm

March 7th, 2009, 2:20 am #6

Does anyone know if the two 40mm sky fire control systems, fore and aft, are for the twin 40's only, or could they, in times past, engage the single 40's as well? As a former Gunner's Mate I was not that familiar with fire control systems other than react to the command, "match pointers and shift to auto."
From the markings on the barrel switches in the gun director tub it appears the director could control the twin 40 by itself, or the twin 40 and one additional 40 single. It could not control all three.
The gun mounts had three modes.
Auto, where the gun director aimed and fired them
Local Surface where the trainer could control the mount with electric motors operated from the control yoke you see on the left side of the mount or
Manual where the hand cranks were used.

I will have to climb up in the tub to make sure but I believe this is right.

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Joined: December 17th, 2005, 10:55 pm

March 10th, 2009, 5:28 am #7

http://www.navweaps.com/index_tech/tech-056.htm



Seabat go back to the index page and the roll pitch and yaw is explained
Last edited by FLT_TECH on March 10th, 2009, 5:49 am, edited 1 time in total.
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Joined: August 24th, 2003, 10:08 pm

March 12th, 2009, 3:44 am #8

My head is swimming.. it's gonna take a while for me to absorb this...
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