For the reason that introduction of the present rules in 2022 it has been obvious that the Milton Keynes crew has gained extra straightline pace than others with an open DRS.
Like all groups, Aston Martin has labored laborious to catch up, with the newest iteration rear wing seen on the AMR23 on the Abu Dhabi Grand Prix final month.
“We observed Purple Bull have been very robust at that final yr, so that they kind of took the march on that,” mentioned McCullough.
“I keep in mind Jeddah final yr was the primary time everybody was going, ‘Wow, that is fairly an enormous DRS change.’
“The interplay between the entire again of the automotive, and the loading on the diffuser, the beam wing, the rear wing, the principle airplane, the flap, the brake ducts, the interplay of all that is clearly fairly completely different to earlier era vehicles.
“And getting a steady aerodynamic platform that we do not have porpoising and all these different issues that we do not need, getting plenty of load, however getting it that once you open the DRS that you’ve got as huge as attain as attainable is the purpose.
“We did not have a very robust one to start out off with, and we have been simply systematically growing to extend that while making an attempt to retain stability.”
Picture by: Mark Sutton / Motorsport Images
Lance Stroll, Aston Martin AMR23, Sergio Perez, Purple Bull Racing RB19
McCullough says it has not been simple to optimise the DRS change given the compromises concerned.
“So all these parts of the again of the automotive are linked,” he mentioned. “There’s solely a lot you are able to do throughout the rules. You are at all times making an attempt to supply downforce and never have an excessive amount of drag.
“However then on prime of that, to get the DRS change and get all these issues working effectively, it’s a problem for the aerodynamic groups.
“And that is why you’ve got seen various growth in that space, not solely by ourselves however by different folks too.”
Concerning the wing trialled in Abu Dhabi, he mentioned: “For us, it was necessary to get it on the automotive on the finish of this yr simply to correlate what we see within the wind tunnel and CFD, and we did some cross-car, cross-session compares, and the wing is performing effectively.”