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Author Topic: U.S.S. Arizona BB-39 Static build  (Read 19507 times)

Colin Bishop

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Re: U.S.S. Arizona BB-39 Static build
« Reply #25 on: January 02, 2017, 07:05:09 PM »

The largest calibre considered to be capable of manual loading was the 6 inch - 100lb shell.

There were some interesting discussions in the RN in the 1930s about new cruiser designs. Single mountings were considered to be more useful in some respects than turret mountings as they could be more widely distributed about the ship and less likely to be put out of action but the downside was that the gun crews would rapidly tire and rate of fire would soon fall off compared with power loading turret guns. Also the turrets provided weather protection although they were not armoured and just had splinter protection.

Colin
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ballastanksian

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Re: U.S.S. Arizona BB-39 Static build
« Reply #26 on: January 02, 2017, 07:13:30 PM »

Yes, lots of WW1 cruisers and support ships as well as a plethora of Pre WW1 ships had single mounts with shields, so much must have been learnt about these issues from serving those ships. I recall reading that the crews of AA guns on ships doing the run to and from Crete being absolutely exhausted even for fit and young bloks, and these were just 4 and 4.7inch weapons!

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Colin Bishop

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Re: U.S.S. Arizona BB-39 Static build
« Reply #27 on: January 02, 2017, 07:16:33 PM »

The effort needed in loading AA guns is documented as being particularly onerous as the shells needed to be pushed into the guns at high levels of elevation.

Colin
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dlancast

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Re: U.S.S. Arizona BB-39 Static build
« Reply #28 on: January 02, 2017, 08:18:55 PM »

Sounds about right Derek.  What amazed me is that these guns were crewed by 15 men  each!  Here is an original op manual for that gun: http://maritime.org/doc/destroyer/fiveinch/index.htm for those so inclined to read more detail.  Of note, note all detail is in the model.. such as sighting scopes, etc.  Can't have it all I guess.. still, not bad for this scale.  Dennis
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Colin Bishop

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Re: U.S.S. Arizona BB-39 Static build
« Reply #29 on: January 02, 2017, 10:18:39 PM »

I think the reason for the 15 men is to literally spread the load and keep up the rate of fire.

Colin
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derekwarner

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Re: U.S.S. Arizona BB-39 Static build
« Reply #30 on: January 02, 2017, 11:45:10 PM »

mmmmmmm Chapter 30 of the 5" gun mount Manual notes.... "the 54-pound weight of the projectile".....  <*< & quite a bit heavier than I thought for AA mounts

[54 pounds is also the nominal weight of projectiles used in the Vickers 4.5" single and twin automatic gun mounts]..... I remember only to  well lifting <*<  dummy rounds in the same gun mount during refit of the mount on HMAS Parramatta]

The Manual doesn't mention, but I think all personal tasked as loaders would need to be right handed as the projectile is lifted and balanced over the left forearm 8) 

Derek
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Derek Warner

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ballastanksian

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Re: U.S.S. Arizona BB-39 Static build
« Reply #31 on: January 03, 2017, 10:08:17 PM »

Interesting reading chaps!
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dlancast

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