i have this idea to get more room inside the helmet, maybe instalin a fan into the jet pack and with one or two hoses extract the heat from the helmet, is just an idea, but maybe its work what do ya think
but try to take the heat and not put cold air into the helmet or you can get the flu, or star with headhec and yadda yadda
imagine that, your cold head, and take off the helmet on a warm site ... the FLU appear instantly and that's not good.
just a thought
actually, you could have a pretty large fan in the JP, so you could have a much larger volume of fresh air coming up to the bucket, which would produce more air movement than the small cpu fans that just fit inside the bucket. you wouldn't necessarily have to use dry ice or anything to cool the air, just the larger amount of air moving around should greatly increase cooling. I suppose one problem with moving a large volume of air around would be that it would make hearing more difficult though. The one line in aand one line out, or "intake & exhaust" idea sounds really interesting too, this really sounds like a project worth looking into or pursiung!!
At the left is the battery holder strap, in the middle the 9V battery connector, which should be loose, and at the right the on/off switch.
The CPU fan is installed in the forehead area, with a wire running from there, thru the "headband" area, and then going down by the earpiece area where you install the on/off switch, and then to the back so you could glue the battery connector/strap piece. All I used was a hot melt glue gun. If you want to go the extra mile, you could buy these cable tubing, and just glue the tubing around, but depends on how much space you have avaliable inside, but it looks cool.