Since the introduction of the current regulations in 2022 it has been apparent that the Milton Keynes team has gained more straightline speed than others with an open DRS.
Like all teams, Aston Martin has worked hard to catch up, with the latest iteration rear wing seen on the AMR23 at the Abu Dhabi Grand Prix last month.
"We noticed Red Bull were very strong at that last year, so they sort of took the march on that,” said McCullough.
“I remember Jeddah last year was the first time everyone was going, ‘Wow, that's quite a big DRS switch.’
“The interaction between the whole back of the car, and the loading on the diffuser, the beam wing, the rear wing, the main plane, the flap, the brake ducts, the interaction of all that's obviously quite different to previous generation cars.
“And getting a stable aerodynamic platform that we don't have porpoising and all those other things that we don't want, getting lots of load, but getting it that when you open the DRS that you have as big as reach as possible is the aim.
“We didn't have a particularly strong one to start off with, and we were just systematically developing to increase that whilst trying to retain stability."
Source: Autosport