Clone Trooper phase1 ,dimentions - sizes

[RTrooper]

Hello there!

This is my first step on theRpf forum, so hello everyone, pleasure to be here

I've got an urgent request to anyone who know/ who have clone trooper helmet -phase one. I very need to know, the sizes/dimentions of this helmet.
If you can help me, please write those in centimeters please.

I cant find it in the net, so I decided to write here, to the specialist

Please, dont give me size of voice changer toy, we all knows its not splended

Are there 501st recomended dimensions?

I very thank you for your help! I will be very gratefull! Thank you!

 

[Darth Lars]

I found Hasbro's full helmet with voice-changer to have quite good dimensions overall, actually.
The base would need to be made wider, and many details are quite a bit off.

Otherwise, I would say that there is no definitive size. The helmets in the movies were all CGI, and could not even fit a human head: especially the neck opening is too small.
All replicas have been slightly different in proportions and dimensions. One fan-made replica I have seen (maybe tried on a long time ago) was very big to allow a head through, others are made to be taken apart so that the neck ring is attached after you have put it on.
See here for pictures, with size comparison: Fan made AotC Clone Trooper Helmets

The most accurate replica (in details and proportions) would be EFX's AOTC LE from 2008, but like the Hasbro, it does not have a neck ring at all.
I made an extensive mod of a Hasbro, where I built a neck ring that I could stick my head through, but it did require widening overall near the base and making the opening longer than what is on screen.