Please select your home edition
Edition
Bakewell-White Yacht Design

l'Hydroptère DCNS - Jacques Vincent talks about the weather holdup

by Stéphanie André on 11 Aug 2012
l’Hydroptère DCNS Francis Demange www.hydroptere.com
For the past few weeks, l’Hydroptère DCNS has been on stand-by in Los Angeles, California. The crew is awaiting their first favourable weather window to set sail for Honolulu. The flying trimaran is set for take-off and all eyes are on the wind gods now. A fitting moment for a round-up of the situation with Jacques Vincent, co-skipper of the boat, as the crew anticipate a key element in a record attempt: the weather.

What is the main weather parameter that will trigger the start procedure?

'We’re targeting a phase when the North Pacific High is in the perfect position so we’re keeping an eye on how this zone is evolving. Ideally, the zone of high pressure has to be further North and slightly across to the East or West if possible. That would enable us to be as close to the direct course to Honolulu as possible and provide us with some good gybing angles for approaching the islands. From such scenarios, we’d prefer for the zone of high pressure to be set slightly over to the West. That would ensure we have lighter winds along the Californian coast and hence a more moderate sea state along the first quarter of the crossing.'

What kind of weather pattern are you expecting for the crossing attempt?


'On the big day we’ll leave port at around lunchtime. The wind will be light, but we know that a thermal breeze is likely to pick up at around 1400 hours. If things pan out as they should, this will be sufficiently strong to get us away from the coast and efficiently negotiate Catalina Island, which will be our first obstacle. Offshore of Catalina, we’ll hook onto a north-westerly air flow, along the eastern limit of the North Pacific High.

The further away from California we get, the more the north-westerly winds will veer, switching round to the North and then the North-East. Midway along the course, the wind will ease a little as it clocks round to the East, which will call for us to put in a tack that will set us slightly higher and to the North of the direct course. Three-quarters of the way along, we’ll need to plan for a gybe, which will distance us from the centre of the anticyclone and its associated overly light winds, at which point we’ll set a course to the South-West and the islands.

During this section of the course, the wind will continue to veer, enabling us to make for our destination on a direct course. As we approach Hawaii, the wind will funnel between the islands and the resulting increase in wind strength will cause the seas to build. That will doubtless be the trickiest element of the crossing, with the famous 'Moloka?i Channel', at the end of which lies the finish line.'


Do you have a general idea of the speeds over each of these portions of the course?

'Between the start and Catalina Island, we’ll be sailing upwind at around 18 knots I think and we may have to put in a tack to get around it. After Catalina, we should be able to make headway at an average of 25 knots. Some 150 miles from Los Angeles, we’ll more likely be making about 30 - 35 knots. To finish off, as the wind veers, we’ll switch to a downwind point of sail, which should see us making 25-30 knots of boat speed again.'

How would you weigh up the impact of the choice of weather window on the chances of success in your record attempt?

'It’s crucial! It’s the weather which enables you to exploit the boat’s potential.'


What kind of plan does the team have in place for surveying the weather and how are you organising yourselves?

'Among the crew, Yves Parlier and I are on permanent weather watch. Alain, Jean and Luc are also running the routing software and passing on their comments to us at regular intervals.

For the time being, during the stand-by period, the weather watch has focused largely on some fairly in-depth calculation models. We’re constantly running the routing and the minute the results begin to resemble the record reference time, we study the departure possibilities in greater detail.

During the stand-by phase, we’re being supported by Christian Dumard, (Great Circle/TVSailing News), a professional router. Over the record period, he’ll also be keeping a watch, directly linked to l’Hydroptère DCNS.

From a more technical viewpoint, with regards the computing element, we’re running the boat’s polars* on the American (GFS) and European (CEP) models. For the start zone we’re using the COAMPS files provided by Saildoc. When the two models converge on the same departure period there’s a strong chance that it will be a good weather window. '

*polars: theoretical speeds of a yacht according to a given angle and wind strength.

Why have you chosen this timeframe to come to California?

'The ideal timeframe begins in mid-June, continues through July and closes up again over the course of August/ early September. In summer, the anticyclone climbs North and the depressions become increasingly rare. These weather conditions enable you to take a more direct route towards Hawaii, without being disturbed by a northerly swell. A second favourable factor is the thermal breeze, which is highly active during this period. '

What have been the weather windows so far?

'We witnessed some very good weather windows over the first few days of July and since then there hasn’t been anything solid. It’s all down to the vagaries of the weather.'

And the upcoming weather windows?

'We haven’t lost hope. With a bit of luck, a weather window may present itself between now and the end of August. On our files, we can view the situation over a ten-day period. In any case, for now we’re fully focused on the routing and l’Hydroptère DCNS is ready for take-off.'

North Technology - Southern Sparsupffront 660x82Colligo Marine 660x82

Related Articles

Les Voiles de St Tropez France – Crash sequence images by Ingrid Abery
Photographer Ingrid Abery has provided this gallery of images from crash sequence Photographer Ingrid Abery has provided this gallery of images from crash sequence
Posted today at 7:00 pm
2017 Annapolis to Newport Race Seminar
Michael Keyworth present on his many years of offshore passage making including serving on Donnybrook as Watch Captain. After a great day at the Show, head to the AYC Clubhouse at its interim location at 12 Dock Street just outside the Boat Show to hear Keynote Speaker, Michael Keyworth present on his many years of offshore passage making including serving on Donnybrook as Watch Captain.
Posted today at 6:30 pm
Count down to Nassau – All-Time Champions - SSL Finals
The fourth edition in Nassau will feature for the first time a full sailing festival, with junior and traditional racing The VIP skippers are invited for their sailing achievements in different classes, and the Star sailors invited are the ones in the top 12 of the 2016 SSL Rankings. Throughout the year, Star Sailors from across the world gather ranking points at events and the top performers make the trip to Nassau for the SSL Finals.
Posted today at 12:03 pm
Didac Costa to take part in Vendee Globe despite lightning damage
Dídac Costa has shown today he is absolutely determined to overcome one more obstacle on his way to the start line. The Spanish sailor Didac Costa has reaffirmed that he will be taking part in the Vendee Globe despite lightning damaging part of his boat’s electronics. His team has called for new sponsors to overcome this latest difficulty. Costa will be the fourth Spanish sailor who has attempted to complete this gruelling race
Posted today at 11:49 am
J70 Worlds - Paul Cayard reports on two races in a hot fleet - Day 3
Two races were held today on Berkeley Circle for the J70 fleet. The first one was in non-planing conditions Two races were held today on Berkeley Circle for the J70 fleet. The first one was in non-planing conditions of eight - twelve knots and the second had winds of fifteen - twenty knots.
Posted today at 4:44 am
2016 Melges 32 World Championship - Newport nor'easter
There are many attractions that Newport offers for sailors around world, iconic sailing venue with rich sailing history There are many attractions that Newport offers for sailors around the world - an iconic sailing venue with a rich sailing history, great entertainment and of course, world renowned clam chowder. One unique Newport characteristic that greeted Melges 32 competitors on the first day of the 2016 Melges 32 World Championship was front edge of a strong nor'easter that brought 20-27 kt winds
Posted today at 4:07 am
Split personality conditions at Day 3 of the 2016 Alcatel J/70 Worlds
Mother Nature had some surprises in store for the 68 boats that assembled on the Berkeley Circle for third day of racing Mother Nature had some surprises in store for the 68 boats that assembled on the Berkeley Circle for the third day of racing at the 2016 Alcatel J/70 Worlds, hosted by St. Francis Yacht Club, namely split personality conditions that tested each boat's light- and heavy-air skills, as well as their patience as conditions played tricks on racers and the Race Committee alike.
Posted today at 3:43 am
Groupama Race – The first Caledonians at Home
A beautiful performance for the kiwis on their Eliott 50. Their complete the Groupama Race in four days 10h and 24 min. A beautiful performance for the kiwis on their Eliott 50. Their complete the Groupama Race in four days 10h and 24 min after nearly 300 NM of 'Match Racing' against local sailors.
Posted on 29 Sep
First all-female Extreme Sailing Series™ team to compete in Lisbon
First all-female GC32 team will make its debut at the penultimate event of the year in Lisbon in just one week’s time. The first all-female GC32 team, Thalassa Magenta Racing in partnership with the Magenta Project, will make its debut at the penultimate event of the year in Lisbon in just one week’s time.
Posted on 29 Sep
J70 World Championship – More action shots from Day 2 by Chris Howell
Photographer Christopher Howell has provided this gallery of images from day two Photographer Christopher Howell has provided this gallery of images from day two
Posted on 29 Sep