Ran across an interesting presentation of the design of Canada’s projected Arctic Offshore Patrol ship (pdf). This apparently dates back to 2008, but it is the most detailed presentation I have seen on their concept.
While probably not as capable as the Healey, which is more than twice as large, something similar might be able to fill the Coast Guard’s stated requirement for two additional medium icebreakers.
The design has several interesting features
- It is designed to IACS Polar Class 5, “Year-round operation in medium first-year ice which may include old ice inclusions” with a double acting hull form.
- It includes three RHIBs and a landing craft, in addition to two 70 man covered lifeboats.
- Flight Deck and hanger sized to support a helicopter larger than the H-60 (the CH-148).
- Propulsion is diesel electric using Azipods. Power is provided by four generators (Can’t say I’m comfortable with how they achieved redundancy by using a centerline bulkhead to split two main machinery spaces into four).
- It incorporates provision for carrying five containers, and has a 10 ton crane on the main deck aft.
- Requires a relatively small crew (45) but includes provision for an additional 40.
Compared to the Wind Class Icebreakers that once made up most to the Coast Guard fleet, they are slightly larger (6,940 tons vs 6,500), much longer (359.5 ft vs 269), narrower (59.7 ft vs 63.5), much more powerful (20,100 HP vs 12,000), and faster (20 knots vs 16.8).
Compared to the Norwegian Coast Guard vessel Svalbard on which it is based it is 50% more powerful.
We can’t be sure at this point, that this is the ship the Canadian’s will build, but it’s probably pretty close.