He also wore a helmet with a perspex disc in front of the visor. The disc would spin in the rain and autonatically clear itself and remain transparent at all times. He said this was also an aero-industry technology but I have no idea whether it was.
I think (not 100% sure) that it actually started out on ships - they had these devices on bridge windows.
PS: I've just looked this up and they were originally developed for cars but adopted by boats/ships.
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