4.7"/45 (12cm) QF Mark IX CPXVII Mount Guns x4 with Sighting Hatches Closed and with Hollowed Barrels. These are highly detailed parts modelled using plans and many reference photographs for the most accurate and detailed 4.7" MK XI available anywhere. Used by most British Destroyers in WW2, please check if uncertain.
- 4x Mountings
- Highly detailed and accurate parts, modelled from plans and photographic reference.
- Barrel and mount is printed separately for maximum detail, elevation set at standard 5º (elevations can be requested)
- details include Hex nuts, accurate Rivet placement, Closed Sighting ports, Individual Gun letter on side of each Shield (A, B, X, Y), Handwheels, Operators Chairs
- All apparatus is included: Sighting, Training and Elevation
- Each Gun comes as 2 pieces made for ease of painting and assembly
The 4.7" (12 cm) QF Mark IX was used on most destroyers built in the 1930s and 1940s. The almost identical Mark XII was designed for use in twin mountings and differed from the Mark IX in 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 for these guns, 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).
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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