Driver height differences usually result in different pedal placement and seat height. You wouldn't alter the halo just because of a helmet as it would alter the aero effect on the entire package which wouldn't be worth it for a helmet alone, it's to compare the performance of it vs the old one.
In one of the tech talks they were discussing the height difference between the two of the drivers on a team (I think it was Alpine) meant they were having issues with airflow discrepancy into the engine. So I think they adjust the pedal boxes as much as possible, but sometimes it's not enough.
You are correct. It was the huge difference between Ocon and Alonso. And it was very clear when Sam was showing it that Ocon’s head does impede air flow.
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u/the_ranting_swede Jun 07 '21
Stroll is a bit taller that Vettel, so maybe they need different aero around their helmets.