25/10/2026
Kia ora folks
Coastguard Hawke’s Bay rescue vessel Celia Knowles was launched in June 2009 and in the intervening seventeen years she proven to be a very capable and successful rescue vessel. She has carried out 509 assists and 185 Police/RCCNZ taskings. Although we have done several electronics upgrades and some engine work, in late 2025 we started to seriously look at what we wanted in a future vessel.
We knew that the basic concept of a 12 metre, twin diesel, twin jet vessel was our benchmark. We were conscious that our engine hours were relatively low for a diesel at 4300 hours, but they were 17 years old and the Cummins QSB 5.9 is no longer available. With vessel replacement cost ranging from $2.8m to $3.5m versus an estimated re-engining option in the region of $500,000 and the state of the economy making local fund raising a real challenge the decision was made to go down the re-engining route.
Bear in mind this was not a case of accepting second best, rather a sensible use community and Unit resources. After all, Celia Knowles is a very good boat and by re-engining we could also take the opportunity to tweak some aspects to make her even better.
We looked at a range of engine options and worked with de Villiers Design, our original boat designer, Musca Marine Design, to model how the water flow around the hull can be made more efficient and HamiltonJet, to design a new jet impeller. After evaluating a number of performance models we settled on new Cummins QSB 6.7 engines, refurbishing our existing gearboxes and retaining our Hamilton 322 jets, albeit with new impellers. We also replaced our ‘fixed trim tabs’ with hull wedges and interceptors.
Although we are still commissioning Celia Knowles we have seen some significant performance improvements – maximum speed has increased from 33 knots to 38 knots, more importantly at our cruise speed of 28 knots we have extended our range, from 335km to 463 km, an effective 38% gain in fuel efficiency, a real positive with today’s fuel prices. And we have come in on budget.
Overall, a successful project, we have improved Celia Knowles’ performance and extended her operational and economic life significantly for less than 20% of the cost of a new vessel. Celia Knowles Rescue will be helping keep boaties safe in Hawke Bay for many years to come.
We would like to acknowledge the support from a number of companies who have helped us achieve this great outcome.
Ahuriri Marine Ltd
Coastguard New Zealand
Cummins NZ Ltd
deVilliers Design Ltd
Direct Earth Ltd
HamiltonJet
HB Crane & Platform Hire Ltd
Musca Marine Design
Protrade Scaffolding Ltd
Pub Charity
Wassco Engineering Ltd
and the wider Coastguard Hawke’s Bay Team and our supporters.
Stay safe.
Henry, Coastguard Hawke's Bay
The attached videos show some of the changes and video of CK at speed before and after the changes. After the changes she rides flatter and better,