Moving from one hull to another is not for the faint of heart in America's Cup racing as Artemis skipper Nathan Outteridge shows here.

Artemis Racing skipper Nathan Outteridge has fallen off his boat during the third race of the America's Cup challenger series final against Team New Zealand.

Speaking after the race, he said he "got a little flick off the back of the boat".

"These boats are turning quite quickly and in an effort to get crew weight up quite quickly, we sprint across, and just as I was crossing the centre of the boat, we straightened the turn, which had me sliding down the aft beam and into the water," Outteridge said.

"It's not the first time it's happened to myself, or to many people on these boats, and it won't be the last time either."

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RICARDO PINTO/ ACEA 2017 It was hands on head stuff for Artemis after they lost helmsman Nathan Outteridge overboard in race three of the America's Cup challenger series final.

​The Swedish team had a narrow lead as the two boats approached the fifth gate, but as Outteridge made his way from one side of their boat to the other, he slid over the edge and into the water.

He was recovered by their chase boat, but as his crew adjusted, they fell way behind the Kiwis.

They then decided to sail their boat home slowly, rather than continue racing, and went down 2-1 in the best-of-nine series.

ACEA 2017 Artemis helmsman Nathan Outteridge went overboard after being caught out by the speed of the boat's tack.

Outteridge said they would review the tape to get a better process in place, should the same thing happen again, but added that "the main goal is to stay on the boat from now on".

The AC50 boats have very few appendages, as they are designed with aerodynamics in mind, which left Outteridge with nothing to grab on to as he fell off.

"Once I resurfaced I looked up and sort of made a little prayer and wished the guys best of luck, and hoped they made the cross and could make a couple of gybes, but it's pretty hard, when any person goes overboard, to get these boats around the track."

GILLES MARTIN-RAGET/ACEA 2017 Nathan Outteridge (right) fell off his Artemis Racing boat.

Team NZ helmsman Peter Burling said they hadn't noticed what had happened to start with.

"We had just come out of the top mark with our heads down and doing everything we could to get past them. Then we realised that they had slowed down and when we went past them about a minute later it made a bit more sense."

Burling said he had done the same thing during practices in the past.

RICARDO PINTO/ ACEA 2017 Moving from one hull to the other on the America's Cup cats appears to be a risky business.

"Honestly, you just get unlucky sometimes. How I went overboard was similar, sliding down the back beam, trying to hold on to things and not break things as you go. So you just get unlucky sometimes and I think it shows how hard everyone is pushing the boats."

Outteridge had been having an excellent day, winning the start against Burling in all three races, but thanks to his dip, and another error in the first race, his team now find themselves behind.

They were outstanding in the second race, where they were about as perfect as possible, but tactician Iain Percy said they have a lot of work to do.

RICARDO PINTO/ ACEA 2017 Artemis sailors make the awkward transition between hulls in the America's Cup challenger series finals against Team NZ.

"I can't say we've come away happy today - there's a lot to work on.

"We don't mind a dog match, we don't mind a fist fight, we've got the calmness under pressure for that, but there were too many mistakes from us, so I hope you see a more refined Artemis Racing tomorrow."

Sunday's results

Team NZ beat Artemis Racing by 47s (Team NZ lead 1-0)

Artemis Racing beat Team NZ by 15s (Tied 1-1)

Team NZ beat Artemis Racing who did not finish (Team NZ lead 2-1)