I punched the numbers into the calculator and this should achieve a PPD or 94.5. A PPD of 90 would be a 32 degree cone. If 52mm is larger than this cone, the PPD is less than 90, and higher than 90 if smaller. I've angled it so that the image starts at the precise angle that the user can see past the top of the helmet, which could allow for some cool "TyMist On" visual animations.
I think this concept looks extremely clean and fresh now. Kind of like Blanc:
Wait a second. This reminds me of Kerwhizz, one of my favourite shows over a decade ago:
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