Posts Tagged ‘Excalibur’

Closer to launching

Saturday, July 7th, 2018

The last month has seen significant progress with Team Britannia‘s round the world powerboat Excalibur. Not only are the engines in place, but we’ve had a trial fitting of one of the jets in order to get precise measurements for the way they fit to the transom. And the complex skeleton of aluminium framework, exposed for so long, is now hidden from view with all the deck plates having been welded into place. The 3/4 inch plywood floor has been fitted in the wheelhouse, the lower part of which is taking shape, so there is now no longer an uninterrupted view from bow to stern. The upper section incorporating roof has already been fabricated, and will be lifted into place very soon.

What hasn’t been shown photographically is the system of pipes and pumps interconnecting the six huge fuel tanks. Apart from delivering fuel to the engine room ready to be mixed with the Clean Fuel emulsifier and water, there’s another purpose. The attitude of a powerboat in the water is generally controlled by trim tabs acting as trailing edge flaps on the underside of the hull at the stern. They work well, but in so doing, they introduce extra drag. Excalibur will be trimmed rather the way Concorde was in flight, by pumping fuel from one tank to another to distribute the weight.

We also hosted our first public open day on 30th June, when around 150 people visited the boatyard, some travelling from as far away as Scotland. They included partners and supporters, enjoying a close-up look at the boat and chatting to members of the crew, all in glorious sunshine, with the barbecue and bar kept pretty busy throughout. We were delighted to welcome Portsmouth North MP Penny Mordaunt, and the media were there too, including Portsmouth News, Express FM and That’s Solent News.

Top calibre Excalibur

Saturday, June 2nd, 2018

As construction of Team Britannia’s round the world powerboat Excalibur approaches its final stages, here are some of the technical questions which have cropped up recently from social media followers.

State of the art round the world sailing yachts are made from carbon fibre composite. So why not Excalibur? We’ve had a strong eco theme running all the way through the project, and for that reason, we couldn’t consider carbon fibre. Light and strong it may be, but in some quarters it’s regarded as the next asbestos time bomb. It simply isn’t an environmentally friendly material – there’s no responsible way of disposing of it once it’s done with. Excalibur, on the other hand, is not only made from recycled aluminium, but in the event that she’s ever scrapped, over 90% of the boat will be recyclable.

The way she’s been put together is also worthy of note. We’ve used pulsed MIG (Metal Inert Gas), an efficient form of welding which provides a neat strong weld, and is particularly favoured for welding thinner aluminium plate, where the problem of warping and burnthrough would otherwise be a risk. Unlike other forms of welding, there is no spatter which has to be cleaned up afterwards, and it’s also favoured where the welder is operating in a confined space.

One of the great advantages of working in aluminium is the way bits can be added and removed to assist with the construction process. An early example of this would be the extra lugs welded on fore and aft to allow the boat to be turned over from its initial state upside down. With the installation of the six fuel tanks and retaining beams which will also support the wheelhouse floor, the top parts of the original frames in the wheelhouse area have now been removed. And with the FPT engines bolted in, you might wonder too how major servicing or replacement would take place, as the photos show the tops of the frames in the way. Here, too, when the transom is in position, the ceiling of the engine room will be remodelled to allow for a bolt-down hatch which can be unsealed if we need to lift anything in and out. Why did the engines go in first? Simply because it’s a lot easier sliding them in from the back rather than craning them in from above!

The boat has been built to conform to a whole raft of codings, verified at every stage of construction by an independent inspector. Excalibur won’t just be A1 – Lloyds of London’s highest shipbuilding quality – but well in excess!

With the installation of our two FPT diesel engines, some have questioned whether they have the power to push a boat of over 50 tons through the water. But having to run passages of over 3,500 nautical miles, the focus is not on brute force, but maintaining a modest average overall speed. This means that when the boat leaves each port fully fuelled, its initial speed will be quite slow. Then as the fuel burns off and the weight reduces, so the boat picks up speed. More powerful engines wouldn’t necessarily add much to our overall average speed, but could burn significantly more fuel.

Apart from a fuel-saving hull design, we have the most efficient power transmission, with the FPT engines coupled directly to our Castoldi jet drives with no intermediary gearboxes. The final piece of the jigsaw comes with our use of Clean Fuel, the diesel, water and emulsifier mixing process which will not only extend the boat’s range, but power it without emitting any of the pollutants normally associated with diesel engines.

Light at the end of the tunnel

Tuesday, May 22nd, 2018

Yesterday saw Team Britannia boss Alan Priddy talking technical stuff at ABC Marine on Hayling Island. They always knew that the mooring posts and cleats for the boat would have to be immensely strong, but just as importantly, they had to be sited in the correct positions.

Whilst crunching the numbers on this, they also ascertained the kind of stresses on the deck likely to be encountered in the extreme event of what is known in the boating world as “stuffing” – where the boat ploughs into a wave at speed. One hopes this isn’t too often, but it happens! On the round the world powerboat Spirit of Cardiff, the most impressive stuffs resulted in broken windscreens! While Excalibur has already been designed to withstand everything that can be imagined, they decided to add some extra upright bars between the keel and deck to provide additional bracing in the event of a full stuff, which could see as much as 100 tons of water on top.

They’ve decided too that the cabin floor will be made from 3/4 inch plywood, with substantial aluminium bracing underneath. With all six 6,000 litre fuel tanks and all the bulkheads in place, they’ve started attaching the deck panels, and the wheelhouse – already assembled – will soon be craned into place and welded on. If that isn’t exciting enough, I can also report that the engines are booked up to be installed in the first week of June. We’ve been down an extremely long tunnel, but the light at the end is now getting very close…

Progress at the boatyard

Sunday, April 22nd, 2018

This photo of Team Britannia‘s round the world powerboat Excalibur caused a bit of a stir when it first appeared on Facebook. Was it Halloween? Evidence of Excalibur’s sharp edge? In fact it’s a special red dye used by our boatbuilders to check the quality of the welds, here along the position of two bulkheads.

And while the views inside the hull, steadily filling up with fuel tanks and bulkheads, look impressive, this above-deck shot with crew member Steve Mason standing through the deck on top of one of the forward fuel tanks conveys the real scale of the boat. It’s going to look even bigger when the wheelhouse and inflatable tubes are in place!

Tanks for the memory

Wednesday, April 18th, 2018

The first full week of resumed work at the Hayling Island boatyard building Team Britannia‘s round the world powerboat Excalibur produced some pretty impressive progress. First a bulkhead was welded into position, then the two forward fuel tanks, 6,000 litres capacity each, were manhandled into place and secured on beds of high-density rubber.

With the tanks in the bow, another bulkhead was welded behind them, followed by another further back, separating the main cabin area from the six-berth forward sleeping area. The main cabin area will actually be above the remaining four fuel tanks to go in – it will all make rather more sense when the already completed wheelhouse is welded into place on top of the hull.

And even as our ace welders from Latvia and Russia continue to work in confined spaces inside the boat, Team Britannia project leader and skipper Alan Priddy has concluded a deal with Technifast, a company manufacturing special mechanical fixings which will attach Excalibur’s enormous inflatable tubes around the sides of the boat.

At the current rate of progress, we’re hoping the boat will be in the water by late June or early July, at which point sea trials will begin, with one or two smaller world record runs before we base Excalibur in Gibraltar ready to tackle the big trip around the world.

Down at the boatyard

Monday, February 5th, 2018

You might think that not a lot has been happening on the Team Britannia front, but things have been quietly moving forward. Having negotiated the funding to finish building the round-the-world powerboat Excalibur, the ABC Marine boatyard on Hayling Island is gearing up to resume construction, with launching projected for late spring / early summer 2018. Sea trials will include one or two record attempts before basing the boat in Gibraltar, and the round the world record attempt commencing in October.

In the meantime, there’s a bumper bundle newsletter to provide a little catch-up on the news. Download directly from here, or visit www.teambritannia.co.uk and enjoy a browse before finding the download link.

Team Britannia – nearly there!

Tuesday, September 20th, 2016

Followers of Team Britannia will doubtless have noticed that while we were booked for the round the world superboat Excalibur to make her first public appearance at the Southampton Boat Show, we didn’t quite get there. We moved heaven and earth to get the boat finished in time, but an accumulation of delays during her construction got in the way. But in a sense, they were all a good thing.

The fact that the boat is intended to take passengers throughout its life means it has to be built to a commercial coding, which means every major stage of the construction had to be signed off by an independent surveyor, along with any changes in design. They included welding 1,560 additional small reinforcing plates not in the original design, one at every point where a stringer crossed a frame. Agreed between project boss Alan Priddy, the boatbuilders and surveyor, it was a time-consuming job, but proved that there’s no cutting corners when it comes to safety.

We also ended up having the aluminium for the wheelhouse cut and preliminary welding done in the Netherlands to save time, with the parts shipped in a giant kit form to ABC Marine on Hayling Island to assemble in a shed next to the one containing the hull. Since the beginning of this month, the boatyard has been operating pretty much 24 hours a day. So we may have missed the Southampton Boat Show, we’ll most likely miss the Monaco Yacht Show at the end of September, but we will be OK to set off from Gibraltar around the world on 23rd October. If it all sounds a bit last minute, bear in mind that in 1998, Cable and Wireless Adventurer set off on her record-setting circumnavigation of the world pretty much straight from the boatyard.

There’s an awful lot more still to do to prepare for this momentous voyage, but once we get the boat to Gibraltar in mid-October, we’ll have plenty of time for any fine-tuning. But for now, with just over a month to go, I’m starting to feel the weight of the hand of destiny on my shoulder!

 

Download the latest Team Britannia newsletter here.