1/72 Scale Royal Navy Tribal Class 4.7" MKXII CPXIX Mount x1. This is a highly accurate and incredibly detailed part for RN destroyers. This has been modelled using the Norman Ough plans and the David Lyon Tribal Class book. This barrels have been printed in place to maximise detail in the gun mounting and has been set at the standard 5º for this class weapon. Elevations upto 40º can be requested. The gun contains 2 parts (Base/Mounts/Barrels and the Shield) and some easy assembly will be required.
- Highly detailed shield with rivets and sighting port doors open
- Barrel elevation set at 5º, elevations available on request
- Details include: open breech with shell in place, training/elevation receivers, mechanical operating equipment for elevation and training, operator chairs and footplate non-slip pattern.
- All usual details include: rivets, hex nuts etc.
- Set contains parts for 1 gun.
The 4.7" (12 cm) QF Mark IX was used on most destroyers built in the 1930s and 1940s. he Mark XII was for use in twin mountings and was almost identical to the Mark IX, being slightly heavier and longer. Both Marks fired separate ammunition, otherwise they were similar to the preceding 4.7" (12 cm) BL Mark I
. A wet-mount version of the Mark IX was developed for submarines, but only a few were in service and these were replaced by standard 4"/40 (10.2 cm)
submarine guns prior to World War II.
The lack of a DP function for these weapons was keenly felt throughout the war as more British destroyers were sunk by air attack than from any other cause. What little AA capability that these weapons did have was hindered by a lack of a tachymetric (predictive) fire control system and the setting of HE time fuzes by hand. The last single mounting designed, the CPXXII, had a spring operated rammer, but all other single mountings were completely hand worked. The twin mounting had power ramming and used power training and elevation but no RPC gear was installed.
Mark IX was constructed of A tube, jacket 80 inches (203 cm) to the muzzle and breech ring. Used a manually operated horizontal sliding breech block with semi-automatic opening. Mark IXA was of loose barrel construction with a removable breech ring. Mark IX* denoted differences in breech ring and semi-automatic breech, which were originally used for two-part wire wound experimental guns. A number of Mark IX* guns were used on destroyers built for Argentina, Brazil and Turkey, but not all of these were delivered. Mark IX** denoted differences in breech ring for CPXVIII mounting. Mark IX**A was for guns converted to loose barrel construction with a removable breech ring. Mark IX**B were new loose barrel guns which differed from Mark IX**A in the breech ring/jacket connection and removable breech ring.
Mark XII was generally similar to Mark IX except that it had a removable breech ring. Mark XIIx had no register on the rear of A tube and breech rings were machined to match. Mark XIIB was of loose barrel construction.
A total of 742 Mark IX and 372 Mark XII guns were manufactured, including all variants. Mark IX**B was one of the largest volume variants, with 183 being made.
Actual bore diameter of all British 4.7" guns was 4.724" (12 cm).
The CPXIX twin mounting was the first British power mounting specifically designed for destroyers. These guns had a trunnion height 13" (33 cm) higher than the single mountings. This required raising the wheelhouse to enable to helmsman to see over the gun shields. It also made loading the weapons at low elevations more difficult. The gun axes were 38 in (96.5 cm) apart.
Some part cleanup will be necessary. The 3D printing process uses a waxy substance to support certain part features during the printing process. Although the parts are cleaned by Shapeways, some waxy residue may remain. It can be safely removed with water and a mild aqueous detergent like "Simple Green" using an old, soft toothbrush, Q-tips or pipe cleaners. During the printing process, liquid resin is cured by ultraviolet light. Microscopic bits of resin may remain uncured.
Let your parts sit in direct sunlight for a few hours to fully cure the resin.
Water-based acrylic paints meant for plastics is strongly recommended. Other paints, especially enamels, may not cure on Frosted Detail 3D-printed plastics.
Use dedicated model sprue cutters to remove parts to minimise the risk of damage to parts.
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