The initial Mid Shore Patrol Vessel Project centred on medium-sized
patrol boats of in length, operating up to offshore at a maximum speed of . Each vessel would carry one or two
rigid-hulled inflatable boats (RHIBs) and have accommodation for nine Canadian Coast Guard personnel as well as up to five
Department of Fisheries and Oceans or
Royal Canadian Mounted Police (RCMP) officers. The vessels were originally designed to be equipped with a
stern launching ramp, allowing RHIBs to be launched and retrieved while the vessel was in motion. The final design for Hero-class vessels is based on those of the Dutch
Damen Stan 4207 patrol vessel. The vessels are
long overall with a
beam of and a
draught of . The vessels have a and a . The ships are propelled by two controllable pitch
propellers and
bow thrusters powered by two MTU 4000M
geared diesel engines creating . This gives the vessels a maximum speed of . The Hero class have a
diesel fuel capacity of , a range of at and can stay at sea for up to 14 days. The vessels are equipped with two RHIBs launched by a single Allied Marine TB10-23
davit. The patrol ships have
Sperry Marine Visionmaster FT radar that operates on the S and X bands. The Hero class have a
complement of nine with capacity for five more. MacKay said the
Organization of American States had suggested Canada reconsider arming Canadian Coast Guard vessels to help counter the drug trade and people smuggling. Coast Guard vessels have never been armed before, while, occasionally, when carrying elements of the RCMP, the RCMP have carried small arms. A
Senate committee recommended Coast Guard vessels should be armed.
Michael Byers, a law professor and commentator on Arctic sovereignty and maritime law has argued that Canadian Coast Guard vessels should have the
"quiet authority of a deck-mounted gun". Criticism of the design and capabilities were raised by safety representatives, citing eleven issues. The vessels suffered numerous issues over their first years of service, including bad wiring, premature corrosion and gearbox failure. Irving Shipbuilding responded to the claims, acknowledging the problems as minor, but stating that Canadian Coast Guard officials and representatives from the marine classification society
Lloyd's Register certified the vessels. Five vessels of the class are to receive redesigned
galleys after the initial ones were deemed unsafe. ==Procurement history==