Rotorcraft

Warm thanks, Georges, for these relevant additions.
Comments and complements of information are very welcomed.

Dear Daniel, thanks for your remarks and questions.
I am actually not a helmet expert but a safety generalist.
Information is available on the internet, for instance and without publicity:
https://en.wikipedia.org/wiki/Whiplash_(medicine);
https://oursafetysecurity.com/best-helicopter-helmet/.
I hope that you will find the references that you need.
Best regards,
Michel, ESPN-R Coordinator

In this context, I would like to contribute my perspective as a remote pilot with a slightly different focus. I agree with everything written here - without reservation. But I would like to add something:

I am concerned with rescue missions that I, as a pilot, know nothing about. Especially in densely populated areas with tall buildings, it is sometimes difficult as a remote pilot to hear an approaching helicopter that is on its way to a rescue mission. On the one hand, the buildings shield the noise, and on the other, there are many other sounds.

If I am flying my drone in cities in compliance with all the rules and a rescue helicopter is approaching at high speed, I can only react very late. As rescue teams can't always maintain the minimum flight altitude, I see this as a risk.

In such situations, I try to talk to the responsible people in advance and keep my altitude as low as possible in known approach routes.

However, I would find a standardized technical system in all drone models (such as ADS-B) that indicates approaching helicopters even better.

Best regards,
Francis Markert
https://drohnen-camp.de