The was filmed beaming as she joined the GB crew in a friendly race against the New Zealand team during a visit to SailGB in Plymouth last week.
A new clip, posted on the Duke and Duchess’ Instagram account, shows sporty Kate Middleton, 40, donning a wet suit and jumping aboard a boat to join Sir Ben Ainslie and the GB crew in the ‘friendly’ competition.
And the duchess looks thrilled by to be part of the high octane action, with footage showing her smiling as the vessel speeds through the water.
The Duchess, who donned a grey cap and a GBR wetsuit for the event, joined the team in a race against the skilled New Zealand outfit helmed by Peter Burling.
The Duchess of Cambridge (left) was accompanied by Sir Ben Ainslie (centre) during her visit to SailGB and ‘friendly’ race against the New Zealand crew
While visiting the team, as well as taking part in the race, Kate joined one of children in planting some seagrass
As she climbed aboard the catamaran to join her new team she was pictured in an orange helmet for safety, as well as a pair of SunGod Great Britain SailGP Limited Edition sunglasses.
The video, which was shared on social media, was captioned: ‘Out on the water with @sailgpgbr last weekend.
‘It’s not only the racing that’s so important to these teams, but their commitment to protecting the future of our planet and inspiring the next generation to do the same.
‘It was so good to see the Protect our Future programme with @1851trust doing exactly this.
‘Thanks for the racing too!’
The Duchess’s face was the picture of concentration as she prepared to show her competitive side during the race
Kate Middleton (pictured) visited the Great Britain SailGP team in Plymouth last week, seen here in new footage shared on social media by the royals
The sporty duchess appeared to smile as she took part in a high speed ‘friendly’ race against the New Zealand team
Video footage of the friendly race shows the royal is not afraid of a bit of high octane speed, as the boat races through the water
Kate took the race in her stride, and was seen smiling as she chatted with crew members aboard the high-speed vessel
The Duchess of Cambridge was led by Sir Ben Ainslie (right) to race against New Zealand in a friendly ‘Commonwealth Race’
Kate looked ready for action in her GBR wetsuit as she got ready to join the Great Britain crew at the SailGP event in Plymouth last week
The Duchess was all smiles as she got ready for the race, despite fairly dreary weather in the background
The Duchess stopped to chat to a sweet little girl wearing a blue dress and tan sandals – while Kate crouched down and smiled at her
Kate looked ready for action as she stepped out of the cockpit of a catamaran to get ready for her race against New Zealand
When the Duchess arrived at the centre last week, before changing into her wetsuit, she wore an equally natutical-style outfit – a dark jumper with white stripes.
She paired the jumper with white linen shorts with gold buttons, from Holland Cooper and costing £199.
The Duchess of Cambridge paired her look with a pair of brilliant white Superga plimsolls costing £59 and simple huggie gold earrings.
The Duchess of Cambridge is Royal Patron of the 1851 Trust, the official charity of the Great Britain SailGP team.
Kate chatted to Hannah Mills OBE, a competitive British sailor and two-time world champion of the Women’s 470 class, ahead of her race
Kate Middleton looked ready for action in nautical stripes and white plimsolls as she prepared to join the Great Britain team
The Duchess had a mischievous smile on her face as she waved at cameras while preparing for her race against New Zealand
Kate wore long sleeves for the slightly chillier weather with a sea breeze and had her hair styled in loose curls, hanging over her shoulder on one side
The charity works with young people, using sport to inspire an interest in science and technology.
In recent years the charity has encouraged young people into climate action with its platform, Protect our Future.
The programme aims to protect oceans and the planet from the effects of climate change by teaching young people about climate science.
During the visit, Kate also joined Protect Our Future programme, learning about seagrass, one of the most important natural tools in countering damaging changes to our climate.