The FIA has revealed Formula 1 cars will be more environmentally friendly and smaller from 2026 in an attempt to produce closer racing.

The sport's governing body described the key concept in the new rules as a "nimble car".

The cars will be 10cm narrower and 30kg lighter, with an even split between internal and electric combustion power, while running on 100 per cent sustainable fuels.

Active aerodynamics, in the form of moveable front and rear wings, will also be used to optimise the new engines.

The Drag Reduction System (DRS) is set to be replaced by a Manual Override Mode – technology that will give the driver an electrical boost of power to get past a close rival.

There will also be a focus on improved safety through stronger structures and tougher tests.

FIA president Mohammed Ben Sulayem said: "The key features of the 2026 F1 Regulations are advanced sustainability, technology and safety.

"Our aim, together with Formula 1, was to produce a car that was right for the future of the sport's elite category. We believe we have achieved that goal."

The new hybrid engines have attracted Audi and Ford, who will be joining forces with Red Bull Powertrains, to join F1, while also persuading Honda to reverse its decision to quit the sport. There will be a total of six engine manufacturers in the sport in 2026, including Mercedes, Ferrari and Renault.

The rules are part of F1's pledge to go net-zero carbon by 2030.

Mercedes boss Toto Wolff has urged Formula One and its governing body to “set the compass right” amid continued controversy surrounding Christian Horner.

Horner was earlier this week cleared to continue as Red Bull team principal following an internal probe into “inappropriate behaviour” towards a female colleague.

But the 50-year-old faced subsequent scrutiny after a series of leaked WhatsApp messages –  appearing to be exchanged between him and his complainant – were leaked to all the major players in the sport.

FIA president Mohammed ben Sulayem told the Financial Times on Friday that the turmoil is “damaging the sport on a human level”. F1 chief executive Stefano Domenicali has not commented on the matter.

Earlier this week, Wolff called for greater transparency from Red Bull Racing’s parent company, Red Bull GmbH, who conducted the investigation.

The Austrian corporation said it was confident the inquiry into Horner had been “fair, rigorous and impartial” and added that the report – understood to stretch to 150 pages – is “confidential”. Horner has always denied the claims.

“Let’s see where it goes in the next days,” said Wolff on Saturday night. “I would very much hope that the governing body, the sanctioning body and the commercial rights’ holder sets the compass right.

“But the moment I start to continue to question how this has been handled, I am probably not doing any good to the whole issue, because then it could be seen as this just being about a power fight within F1.

“That’s why I think it’s not in the team’s hands. It’s a much bigger topic than that and I don’t want to diminish the whole situation by making it seem like the Mercedes guy is talking about the Red Bull guys.”

Wolff was speaking after a disappointing opening race of the season for his Mercedes team at the Bahrain Grand Prix.

George Russell started third and finished fifth – 47 seconds behind winner Max Verstappen – with Lewis Hamilton taking the chequered flag in seventh, 50 sec adrift.

Wolff continued: “Max is in a different league, a different galaxy. We just have to acknowledge his performance levels.

“But I believe that the group of Ferrari, McLaren and Mercedes were probably in a similar ballpark. We just need to look at ourselves, get on top of our problems and if we are able to manage our race weekend better, we will be racing those guys.”

Formula One boss Mohammed Ben Sulayem has defended historic sexist remarks on his personal website in which he allegedly said he does “not like women who think they are smarter than men” – and revealed that he was subjected to a racist slur as he campaigned to become FIA president.

In a PA news agency interview, the 62-year-old Emirati – elected to the biggest job in motor sport in December 2021 – vehemently denied claims of misogyny and said he had been the target of an “inhuman” smear campaign.

Ben Sulayem also compared Lewis Hamilton’s contentious championship defeat in 2021 to England’s 1966 World Cup final win against West Germany, following Sir Geoff Hurst’s controversial ‘offside’ goal, while reiterating his belief that Michael Masi – the man accused of denying Hamilton a record eighth world title – could return to the sport.

In January, Ben Sulayem was quoted on an archived version of his old website saying that he does “not like women who think they are smarter than men, for they are not in truth”. At the time, the FIA said the comments, which date back to 2001, “do not reflect the president’s beliefs”.

But personally addressing the remarks for the first time, Ben Sulayem told PA: “What did I say, if I said it? Let’s assume it was (me). I tell you exactly what it said. It says: ‘I hate when women think they are smarter than us’. But they hate when men think they are smarter than them.

“Did I say we are smarter? No. Did I say they are less smarter? No. For God’s sake, if that is the only thing they have against me, please be my guest, you can do worse than that.

“People can go back and see what has been said, and if I have said anything against women. In 117 years of the FIA, I am the only president who brought in a female CEO (Natalie Robyn).

“I made the commission for EDI (Equality, Diversity and Inclusion), and I brought a woman in (adviser, Tanya Kutsenko).

“There is disrespect to women if you say we have to have 30 per cent (female staff). You bring them in on merit and credibility. And that is why they are there.

“Look at Bernie Ecclestone’s wife. (Fabiana Ecclestone, Vice-President for Sport in South America). She is one of the most active. They said that I brought her in because of the support from Bernie. But Bernie doesn’t have any connection with any votes. He has no power over them.”

Ben Sulayem took the unprecedented decision to relinquish the day-to-day running of F1 in February after he clashed with the sport’s American owners Liberty Media over the introduction of an 11th team and questioned the valuation of the sport.

A month later his son, Saif, died in a road traffic accident in Dubai. In April, further allegations emerged after the Daily Telegraph reported that Shaila-Ann Rao – the FIA’s former interim secretary general for motorsport – wrote a letter to the governing body accusing Ben Sulayem of sexist behaviour.

“When we opened a position as CEO, Shaila-Ann wanted to be the CEO,” continues Ben Sulayem. “I could not get involved. I said, ‘Shaila, you are good, go through with the process’. We had 150 applications, and everybody went through that process.”

Ben Sulayem then reaches for his phone to reveal a WhatsApp message he claims to be from Rao thanking him for hosting her at the Italian Grand Prix earlier this season.

He adds: “I don’t want to do any comment. But that is from September. Sexism, please! Do they have anything else? Why don’t they come and confront me?”

Ben Sulayem continues: “The attack on me earlier this year was inhuman, with the tragedy that I had. I would love that if I did these things that I was accused of, you sit with me, challenge me and confront me. But don’t fabricate and throw things at me, and then when I tell you to prove it, you run away and don’t come back. That is not the way.”

Asked if he was being targeted, the former rally driver, who is midway through a four-year term, replies: “Yes. Because I am doing the right thing.

“Imagine in my campaign, in Europe, that someone said to me: ‘Don’t ever think we will accept our president of the FIA to be an Arab Muslim with the name of Mohammed’.

“I laughed because I knew how to beat him – by winning. But my Christian team were so upset with him. I said, ‘no, leave it, please, this is something I expect from them’. But can we go back to work? And work for the passion that we love, which is motorsport, and improve it?”

Ben Sulayem succeeded Jean Todt five days after Hamilton was sensationally denied a record eighth world title at the 2021 season finale in Abu Dhabi.

Race referee Masi’s failure to imply the correct rules left Hamilton at the mercy of Max Verstappen. The Dutchman took the championship in the desert before quickly racking up another two titles in his all-conquering Red Bull. Hamilton has not won a race since.

A subsequent FIA investigation blamed “human error” before Masi was removed from his post. However, the governing body stopped short of a public apology to Hamilton.

“I always apologise, but I cannot apologise for something which was done before my time,” said Ben Sulayem. “OK, I will do the apology, but I will bring Michael Masi again. Do you think that is right?

“The poor guy is a person who has been attacked and abused. Michael Masi went through hell. Hell! And if I see there is an opportunity that the FIA needs, and Michael Masi is the right person, I will bring him.

“I even had people threatening me to kill me because I had the power to change it (the result). But I said to them: ‘Sorry, the World Cup of 1966, England against Germany, was that correct? Did they change it? No.’ Did they give it to Germany? Nein.”

Formula One’s ruling body the FIA has said “allegations of abuse are taken very seriously” after its president Mohammed Ben Sulayem was accused of sexism.

The Daily Telegraph has reported that former FIA employee Shaila-Ann Rao wrote a letter accusing Ben Sulayem of sexist behaviour following her departure from the federation last year.

Rao, who was the FIA’s interim secretary general for motor sport, left the organisation in December after just six months.

However, the FIA said it followed “due process” following the “specific allegations” surrounding Rao and said an “amicable negotiation” followed.

Responding to the Daily Telegraph’s report, a spokesperson for the FIA said: “The FIA takes allegations of abuse very seriously and addresses all complaints using robust and clear procedures.

“As part of this, the FIA has an anti-harassment policy, an anonymous whistleblowing facility and an investigation procedure and all staff are made aware of these through an induction and regular training.

“With regards to the specific allegations surrounding Shaila-Ann Rao, due process was followed, with an amicable negotiation conducted by the President of the Senate and as such, no referrals were made to the Ethics Committee.

“As previously stated, both parties agreed she would leave her position in November 2022 and mutual privacy terms were agreed as is common business practice.”

Rao’s claim in her letter – which the PA news agency has been told by a high-level source in the sport was sent – is the latest in a string of setbacks which has marred Ben Sulayem’s presidency.

Earlier this year, Ben Sulayem, who took on the role as FIA president from Jean Todt in December 2021, was quoted on an archived version of his old website as saying that he did “not like women who think they are smarter than men”.

The FIA said the sexist remarks do not reflect his beliefs.

He was also accused of “unacceptable” interference by F1 in response to a series of tweets in which he said a £16.2billion valuation of the sport was “inflated”.

New Sprint format gets seal of approval from @F1 Commission and World Motor Sport Council – here's how the upcoming #AzerbaijanGP weekend will look ?https://t.co/Rt3CeiCg7s

— FIA (@fia) April 25, 2023

Ben Sulayem was told that the FIA could be “liable” for harming the value of F1’s owners, Liberty Media.

The president has also clashed with seven-time world champion Lewis Hamilton over the wearing of jewellery in the cockpit, while the FIA this season U-turned on a move to prevent drivers from making “political, religious or personal” comments without prior approval following a driver-led backlash.

Ben Sulayem gave up the day-to-day running of F1 to director of single-seater racing Nikolas Tombazis in February. He is however expected to attend this weekend’s Azerbaijan Grand Prix despite the latest storm.