An America's Cup promotional video shot ahead of the 35th America's Cup in Bermuda.

Team New Zealand continue to turn heads in Bermuda, revealing more breakthrough tactics in the leadup to the America's Cup.

A day out from the next five-day block of official practice races starting on Tuesday (NZ time), the Kiwis were excelling in the light air conditions on the Great Sound.

For a while they chose to train without a jib, the smaller sail at the front of the boat, which is allowed under the rules but has rarely been utilised.

EMIRATES TEAM NZ Peter Burling at the helm of Team New Zealand during testing.

The move, last used by Oracle in their breakthrough 2010 multihull America's Cup win over Alinghi, allows cleaner air for the 24m wingsail.

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Team New Zealand also appeared to be using a new set of bright yellow rudders for the first time.

While their rivals were struggling for consistent foiling in the 5-10 knot breezes, the Kiwis were "able and stable", an encouraging sign as the lighter airs start to descend on the island nation and are expected to increasingly dominate the official cup racing that runs from May 27 to June 28.

The Kiwis were also foiling while sailing to windward, in the tricky breeze.

Team New Zealand have also shown their stability through turns, unveiling a "fish tail" sequence of moves they believe will be important if they need to shake a rival during a match-racing tacking duel.

Team New Zealand's only blemish over another busy weekend of fine-tuning came when they lost skipper Glenn Ashby overboard as he got out of synchronisation with his stepping over the trampoline during a turn and went off the side, importantly landing well clear of the flying catamaran.

Interest will centre on what the six teams are willing to use during the practice racing.

Defenders Oracle Team USA have been out trialling their new pedal-powered grinding station that supplements their two regular arm-powered stations in each hull.

As predicted by Team New Zealand skipper Glenn Ashby, Oracle were changing their grinding configuration between upwind and downwind sailing.

They were using four arm grinders into the wind and then freeing up tactician Tom Slingsby for the downwind legs, moving him behind skipper and helmsman Jimmy Spithill to operate on the bike station, allowing him more observation opportunities while still providing power.