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C-Class
In the 1970s the RNLI saw a need for a larger inflatable boat to fit the Stations who were in need of a new vessel between the D-class and the ALB. This resulted in the C-class which came into service in 1972. Using the Zodiac Mk.IV. These boats were initially numbered in the D-500 etc range. This was due to the D-class being numbered from D-1 to 499. The rNLI Were in the process of working out their numbering system and in 1983 the D-numbers were changed to C-numbers. The boats were gradually replaced in the 1980s by the larger Atlantic 21.
Specifications: (Ib1 spec)
| Length | 17' 6" x 7' | Speed | 25 kts |
| Weight | 1300 lbs (586kg) | Range | |
| Construction | Hyperlon inflatable | Endurance | |
| Engines | 2 x 30 hp outboards | Crew | 3 |
| No. | Name. | Base/Comments. |
| C-500 | ||
| C-502 | ||
| C-503 | ||
| C-504 | ||
| C-505 | ||
| C-506 | ||
| C-507 | ||
| C-508 | ||
| C-509 | ||
| C-510 | ||
| C-511 | ||
| C-512 | ||
| C-513 | ||
| C-514 | ||
| C-515 | ||
| C-516 | ||
| C-517 | ||
| C-518 | ||
| C-519 | ||
| C-520 | ||
| C-521 | ||
| C-522 | ||
| C-523 |
The 2nd listing of the C-class is when the rNLI were still trying to work out their numbering system where Bnumbers were used for twin-engined boats. This listing shows what are believed to be prototype Atlantic 21s. But it is not recorded if these are 17 ft boats or 21 ft examples the ex-B number is shown as these vessels ended up being renumbered in the C-range.
| No. | Name. | Base/Comments. |
| C-1 | ||
| C-2 | ||
| C-3 | ||
| C-4 | ||
| C-5 | ||
| C-6 |