Jean Todt adamant 2017 Formula 1 rules will be finalised this month

The original deadline of February 29 was pushed back as lengthy discussions took place regarding power units and aero changes.

The aero regulations are said to be close to being finalised, with the bodywork changes for more dramatic-looking cars already approved last month.

But there is still some work to be done on the engine rules, with cost, performance, noise and supply of power units the focus.

"The final regulations will be decided by 30 April," said Todt, who added that only a majority rather unanimity is required to push the rules through.

"At the last meeting we had, I asked the engine manufacturers to drop the price of the engine to make sure every competitor in F1 will have the possibility of having one engine supplied.

"We have also asked them to agree on engine convergence and to make some proposals to increase further, as it already has been one step, the noise of the engine.

"As we did not have a proposal which was satisfactory, we unanimously agreed to delay the introduction of the 2017 regulations to the 30 April."

There has been a desire to make the cars significantly faster next year but that has caused concern among drivers who feel that will make it tougher to overtake.

FIA race director Charlie Whiting believes those involved have done the best they can to take everyone's views into account to come up with a set of rules.

"We have had countless meetings with technical directors of every team and we have had a range of proposals [ranging] from what appears to be a huge amount of downforce to a very low level of downforce," he said.

"But it's all based on the premise that we have a significant increase in mechanical grip so what we have ended up with is somewhere in the middle.

"It's incorrect to say the anticipated laptime improvement will all come from downforce because it simply shouldn't.

"The idea is half will come from mechanical grip and the other half from aerodynamic downforce.

"One of the things we have been talking all along is the fact we shouldn't make it more difficult to follow another car.

"We've done the best we can, I believe, given we have to take everyone's views into account."