15 cm No. 9, 10 and 11
These guns were improvements of the Mark 6. The Tromp, the only surviving ship with this type, was later supplied with British and American built 5.9 inch shells, which didn't work very satisfactory. The difference between the guns were the mounts used. The guns for De Ruyter were based upon the Swedish M/30 design, which was mounted on the seaplane-cruiser Gotland in 1934.
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| De Ruyter firing her main guns during an exercise (Associated Press photo, collection webmaster) |
| Gun specs | ||
| Manufacturer | Bofors, Sweden | |
| Purpose | Against surface targets. A limited role as AA-weapon was envisioned as well, but the mounts proved to be too cumbersome in practice. | |
| Bore | 149,1 mm | |
| Classes used on | Mark 9 and 10: Mark 11: |
De Ruyter-class cruiser Tromp-class cruiser |
| Length | 50 calibers | |
| Gunweight | 7,5 tons | |
| Initial velocity | 2953 feet/sec | |
| Rate of fire | 5 - 6 rounds minute | |
| Shell specs | ||
| Shell types | Dutch HE and AP, British HE | |
| Shell weight | Dutch HE: Dutch AP: British HE: | 46 kg 46,7 kg 45,3 kg |
| Range | 23,200 yards @ 29 degrees 30000 yards @ 45 degrees |
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| Mount specs | ||
| Mount type | Mark 9: Mark 10: Mark 11: |
Double mount (De Ruyter) Single mount (De Ruyter) Double mount (Tromp-class) |
Elevation | +60 / -10 degrees |
| Mount armor | De Ruyter: | 30 mm sides 100 mm front |
| Tromp: | 15 mm all sides | |
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