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Author Topic: RN 20mm Ready-Use Ammunition Lockers...........  (Read 1691 times)

Chris Preston

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RN 20mm Ready-Use Ammunition Lockers...........
« on: March 22, 2020, 10:47:31 pm »

'Afternoon All,


Would anyone happen to know the dimensions for RN pattern 20mm Ready-Use Ammunition Lockers, as fitted to RN Coastal Forces MTB's and MGB's? I'm building a Deans Marine BPB Co. 71' 6" MTB and need to confirm the measurements of said lockers.


Many Thanks.


Cheers,


Chris Preston,
Victoria, BC
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ballastanksian

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Re: RN 20mm Ready-Use Ammunition Lockers...........
« Reply #1 on: June 18, 2020, 08:19:46 pm »


I am not sure if there was a standard shape or size beyond being the correct size to hold multiples of the magazines. Your best bet is to study images of the vessel you plan to build and then scale any lockers you see by the weapons from known dimensions of parts of the ship near by.



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Chris Preston

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Re: RN 20mm Ready-Use Ammunition Lockers...........
« Reply #2 on: June 19, 2020, 01:57:33 am »

Many Thanks for your reply.


I believe these lockers were built to a standard size, and used onboard all ships and vessels equipped with Oerlikons. My problem is that I ordered a set of four 20mm R/U Lockers AND a Twin 20mm Oerlikon Mount on the Mk IX Mounting  in 1/24th scale from Shapeways, and both sets came out larger than 24th scale - more like 1/20th !!! I've confirmed the Oerlikon guns and their mounting are over-sized, but was just looking to confirm the size of the lockers (which I've since done). The plans I have are correct and verified, so I'm now back to scratch-building the lockers and mounting. I don't think I have any recourse with Shapeways as I no longer have the purchase order, but in future, I'll be verifying the scale size with the producer before placing an order.


Thanks again for your help.


Cheers,


Chris - in Victoria, BC
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John R Haynes

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Re: RN 20mm Ready-Use Ammunition Lockers...........
« Reply #3 on: June 19, 2020, 10:00:54 am »

When ,many  years ago, I visited Mr Tough of Tough Brothers [Coastal Forces boat builders ] in Teddington near London he said that when he was busy building coastal forces vessels , mainly Fairmile B's he incorporated whatever the vessel's commander wanted in the way of lockers ,guns etc and these were sized to fit on the deck ie no standard size.
That's MTB's of course .  My own RN Oerlikon lockers at 1/96 measure  7mm wide x 6.5mm deep x7mm high plus the feet.   USN Oerlikon lockers are totally different in size. 
While I was there I obtained lots of drawings detailing these ships and passed the onto John Lambert to incorporate into his plans.   
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Chris Preston

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Re: RN 20mm Ready-Use Ammunition Lockers...........
« Reply #4 on: June 19, 2020, 08:14:08 pm »

Thanks John,


I'm just trying to confirm the actual dimensions of RN (and RCN) pattern 20mm R/U Lockers, to confirm whether or not the plans I have are correct.


Cheers,


Chris
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Re: RN 20mm Ready-Use Ammunition Lockers...........
« Reply #5 on: June 19, 2020, 08:37:43 pm »

Hi Chris,

You said just before which conflicts a bit with your last post...

Quote
The plans I have are correct and verified

....Perhaps if you could post a pic or a scan of that part of the plan, or give the relevant dimensions you have it might make it easier to check?  More info is always easier to deal with.

Rich
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Chris Preston

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Re: RN 20mm Ready-Use Ammunition Lockers...........
« Reply #6 on: June 20, 2020, 06:16:26 am »

Hi John,


E-mail sent with attachment showing the plans I have. Thanks again for your help.


Cheers,


Chris
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Jonty

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Re: RN 20mm Ready-Use Ammunition Lockers...........
« Reply #7 on: June 27, 2020, 06:13:38 pm »

May be worth asking David J Parkins - he seems to have done his homework:
https://www.djparkins.com/product.php?productid=18198&cat=264&page=1
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