Ironman neck scaling guide
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First get your neck on screen like the image above. Zoom till "B" is 100mm across on screen then measure "A" (about 56mm, my office light wasn't on and I have lots of junk in the way of the light switch). You now know your neck opening is 56% of the total width "B". We will call the percentage "C". So the equation is A/C X 100=B. So measure your RL neck width, mine is 140mm including the thickness of my foam. 140/56X100=250. So the total width of my neck piece is 250mm.
Hope this should sort out your problem
Tom.
Edit: You may want to add a little to YOUR neck width so you have a bit of space in there or you might find it a little tight. I think I added 10mm so there is a 5mm gap all the way around.
Drack - you rock man! Thanks for all that effort dude. I'm just tweaking the helmet now with padding, lighting and faceplate mechanism then I will be onto the neck next.
Cheers bloke!