Flexible wings allow teams to run their cars with more downforce in the corners by flicking to a maximum downforce specification, without sacrificing straight-line speed. Further inspections on the designs are taking place from the Australian Grand Prix this weekend.
Strict restrictions on wing designs are set to be implemented midway through the year, at the Spanish GP on June 1.
The FIA are becoming stricter on the use of flexi wingsHelmut Marko has slammed the FIA's latest decision
Marko hits back at flexi wing tests
Now, Red Bull chief Marko has hit out at the flexi wing changes, calling for clearer rules and describing the change as ‘insane’.
"Now everyone except the smaller teams has built a wing that bends," Marko said to Auto Motor und Sport.
"It's insane that they can throw them away again in the middle of the season. Either the new rule applies right from the start of the season or not at all.
"The FIA should have realised by now that rules have to be written in such a way that there are no grey areas.
"A comprehensive check of bending is practically impossible. The teams have far more manpower than the FIA.
"Poor Nikola Tombazis [FIA Technical Director] is left alone against an army of engineers who are coming up with clever ideas.
"To protect ourselves against this, the rules need to be clearer. So that there is no room for interpretation within such a framework. What cannot be verified must not be permitted."