MichaelBess 0 #26 December 30, 2003 Hi again, I thought we were having a good debate and meant no disrespect about asking if you were a Dr. I really do want a medical explanation as to what my test facts have led me to believe. I am sorry if you feel I was trashing you, that was not my intention. I question everything as I hope others do (like yourself). I support that way of thinking 100%. I do hope everyone has an open mind and considers all possibilities. I am guilty as sin of sometimes not having an open mind all the time I was never claiming to be a great skydiver only to show that I had experienced this phenomenon over a long period of time. Quote Share this post Link to post Share on other sites
hottamaly 1 #27 December 30, 2003 Quote Quote Quote Bonehead's "thermofit" liners definitely expand at altitude. just to add a little bit to this. I know of 2 jumpers that lost their boneheads (one with a camera, one without) and they both said that it always seem to fit very snug at altitude, but under canopy, it was always really loose. Both were lost in freefall. We here at Bonehead feel that allot of people don't wear their helmets correctly on their heads (tilted back instead of directly on top) and after cinching them up, everyone needs to tack down the chin strap so it won't loosen. It doesn't matter what helmet you are wearing, if it is not placed properly on the head and not tightened down, it will probably come off eventually. It needs to be tightened on the ground so it's almost uncomfortable at altitude because it does loosen (due to air pressure) on the way down. My 2 cents worth Skydiving gave me a reason to live I'm not afraid of what I'll miss when I die...I'm afraid of what I'll miss as I live Quote Share this post Link to post Share on other sites
DrAvalanche 0 #28 December 31, 2003 Well, I was at work on a 25-hour shift yesterday when I replied to your post. And I do tend to get quite grumpy when I don't get my sleep . But yes the discussion has been amusing. But I still very much would like to see the facts you've collected on the subject, for the sake of my curiosity. At least I got a few more post so I'm closer to get rid of this irritating newbie-status Well, the sun is shining, there's no wind and about -5 degrees (celcius). So I'm of to get a new years jump. Who-hoo! "We Are The Light At The End Of Your Sorry Little Tunnel" Quote Share this post Link to post Share on other sites
bch7773 0 #29 December 31, 2003 Quote You are not far off. When you are at altitude your head actually does expand slightly. just thought of something... so if you are saying that your head expands because of lesser pressure, then one can assume it would contract or shrink in greater pressure. And so if you went scuba diving, even to a novice depth of 60 ft, you would have about 3 atmospheres of pressure on your head. And at an altitude of 10,000 ft, the pressure is about .7 atmospheres. Something tells me if your head expanded even a few milimeters at altitude, then it would shrink about a centimeter when scuba diving. I think people would notice if their head shrunk a centimeter. my guess is that its the thermal contraction of the helmet. MB 3528, RB 1182 Quote Share this post Link to post Share on other sites
