“This project video shows the process from design to sea trials of a Hull Vane retrofit on the 52 m Offshore Patrol Vessel Thémis from the French Affaires Maritimes. The installation was done by CMN Cherbourg, which was also the builder of this vessel (delivered in 2004).”
I have posted on this particular innovation before, twice in fact, in 2017, “Hull Vane Claims Improved Performance,” and in 2015, “Hull Vane on an OPV,” but now we have another example and new information. This time the example is a mid-life up-grade on a vessel slightly larger but otherwise similar to the Webber class WPCs, the OPV Thémis from the French Coastguard (Affaires Maritimes) 409 tons, 6,310 HP, 52.5x9x2.27 meters (172.2×29.5×7.45 feet)
The results of this trial:
Comparison with the benchmark sea trials – conducted in January in exactly the same conditions – by CMN’s sea trial team showed a reduction in fuel consumption of 18 percent at 12 knots, 27 percent at 15 knots and 22 percent at 20 knots. The top speed increased from 19.7 knots to 21 knots.
The earliest post, “Hull Vane on an OPV,” reported the effects of applying the innovation to a 108 meter Dutch Holland class OPV, a ship very much like the Offshore Patrol Cutter (OPC).
- They claimed a 12.5% reduction in fuel consumption, overall. Specifically they claimed. “…runs were done to determine the resistance at 5 knots, 12.5 knots, 17.5 knots and 22.5 knots, showing resistance reductions of 1.3%, 13.7%, 15.3% and 11.1% respectively.”
- A 4% reduction in heave,
- A 7%% reduction in pitch, and
- A 13% reduction in vertical acceleration at the flight deck.
A comment on this earliest post, received from the Hull Vane team, noted.
“The performance is better however on the fuller-bodied and wider-transomed hull shapes like the typical US Coast Guard cutters, which we would very much like to do some work on.”
The Hull Vane web site has a number of publications, testimonials, and case studies, including a Nov. 2017 report on a 25 meter patrol boat. that claimed a 20% reduction in fuel consumption. It also noted “RPA 8 is the eighth vessel to be equipped with a Hull Vane®, and ten other ships which will have a Hull Vane® are currently under construction.”
As the new ships enter service, we will probably see the Webber class using more fuel than the 110s, and almost certainly the OPCs will use more fuel than the 210s and 270s.
I would think we would want to check this out, starting with contacting the Dutch Navy and the French Affaires Maritimes to get their take on the tests. Did they think they were successful? Are they going to use Hull Vane on their own ships? If not, why not? That would cost us very little. If the responses are positive, it would make a great R&D project. Bollinger might welcome the opportunity to try one out on a new construction Webber class. The baseline capabilities of the class are already well documented.