Why do people use ear stuff on helicopter, can't they talk without it?

Question

thanks i never knew that

Answer 1

the engine noise is so loud that you can't hear each other.

Answer 2

The engine is just too loud, so you wouldn't be able to hear anything the person beside you is saying.

Answer 3

so they can hear it is part of their receiver set.

Answer 4

By "ear stuff" I presume you mean headsets.  They are not necessary on all helicopters, but they are a good idea on the noisier ones.  Headsets provide protection against hearing loss, and provide clearer communication by intercom in a high-noise environment.