Formula 1 teams warned FIA about shark fin loophole in 2017 rules

Large fin-like bodywork extensions atop engine covers - last seen in 2011 - have been common on this year's new F1 cars, as they provide an aerodynamic advantage through the corners.

However their aesthetics have proven divisive, and Red Bull's Horner said during the first day of pre-season testing at Barcelona that they should be removed on those grounds.

"The cars look fantastic," he said.

"The only thing that lets them down is the shark fins.

"It's something we raised at the F1 Strategy Group meeting last year, to ask all teams to remove them because it's pretty marginal the performance gain they offer.

"In the interest of aesthetics, it was requested they be removed.

"That went to the F1 Commission and unfortunately it was immediately rejected by the majority of teams so hopefully it's something that can be addressed for next year.

"The cars look great. it's a shame this shark fin has crept in to a loophole in the regulations."

Horner said that while the devices provide a performance gain, ensuring cars look good remains an important factor that must be taken into consideration.

"If you ask our aerodynamicists, they would like to retain it," he said.

"The cars look more aggressive, they look more challenging and it's wrong to ignore the aesthetics of the car.

"Unfortunately, this is a consequence of the rules but one that should have been able to be addressed quite quickly."

Meanwhile, Horner believes Red Bull's suspension system is within the regulations after the outfit consulted the FIA.

There has been debate among teams readapting the legality of clever hydraulic suspension systems in F1 since Ferrari sought clarification of the rules late last year, with race director Charlie Whiting expected to issue a technical directive.

"The FIA appear to be happy with the way we have interpreted the rules," said Horner.

"If anybody has a problem with that, they have the right to protest.

"We can only go on the advice we receive from the governing body.

"Certainly all the feedback we've had has been - [there is] no issue."