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Skin tight space suits ?
On Monday, July 17, 2017 at 7:56:07 PM UTC-4, Fred J. McCall wrote:
JF Mezei wrote: On 2017-07-16 19:29, Fred J. McCall wrote: Don't worry about the whole 'blood boiling' thing. That takes a while, even in pure vacuum. Worry about dissolved blood gasses coming out of solution. ok, so the "bends" is the bigger problem then. and i guess a "no pressure" suit would require much longer camping in airlock than 5psi suit. A "no pressure suit" means you die. especially true if you breathe in at 5psi and blood flows to no pressure areas of body. Where did you get this 'no pressure' idea? but if low/no pressure has instant effects on the blood releasing disolved gases, wouldn't the same happen to its boiling point? Do divers have problems with blood boiling? if the skin bloats in lower pressure, couldn't they make a suit that is easier to get in and let body bloat create the pressure? Because you can't reliably create consistent pressure everywhere that way AND you'd like to not injure people. also, have they solved the issue of anus and urethra? wouldn't lower external pressure result in far more difficult time for muscles to contain what's in body? assuming perfectly moulded suit, would mechanical fabric pressure on anus do the trick or does this really require gaseious pressure to reach the muscles so there is equilibrium? You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell you this. I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed. |
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Skin tight space suits ?
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#4
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Skin tight space suits ?
Jeff Findley wrote:
In article , says... You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell you this. I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed. Obviously you misunderstood what was said, as usual, Dougie. There is no 'mask' on a U-2 suit. It's a hard helmet. They eat paste that is squirted in through a lock in the helmet. The original aircraft were pressurized to around 30,000 feet altitude equivalent, which means if you aren't in a sealed suit you die. U-2 started out as unpressurized http://www.lockheedmartin.com/us/new...U260Years.html But later, cockpit pressure was increased to the equivalent of about 14k feet, which is pretty thin. http://aviationweek.com/blog/what-do...ane-pilots-eat Still, the above article does confirm that flight at altitude is done with a sealed helmet and that pilots must remain alert, so I don't see how "sleeping" would ever be allowed. That plane is a bitch to fly. It's very unforgiving at altitude. Actually the original aircraft pressurized to 50,000 feet. If they were totally unpressurized the pilots would have been unable to manipulate the controls at high altitude due to the pressure in the suit. As you note, there was a later program to reinforce the airframes so that they could hold more pressure. This was undertaken because several pilots exhibited symptoms of the bends because of the low cockpit and suit pressure. By increasing the pressure in the cockpit they could increase the pressure in the suit and still have the pilot able to fly. -- "The reasonable man adapts himself to the world; the unreasonable man persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man." --George Bernard Shaw |
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Skin tight space suits ?
On Thursday, July 27, 2017 at 7:17:03 AM UTC-4, Jeff Findley wrote:
In article , says... You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell you this. I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed. Obviously you misunderstood what was said, as usual, Dougie. There is no 'mask' on a U-2 suit. It's a hard helmet. They eat paste that is squirted in through a lock in the helmet. The original aircraft were pressurized to around 30,000 feet altitude equivalent, which means if you aren't in a sealed suit you die. U-2 started out as unpressurized http://www.lockheedmartin.com/us/new...U260Years.html But later, cockpit pressure was increased to the equivalent of about 14k feet, which is pretty thin. http://aviationweek.com/blog/what-do...ane-pilots-eat Still, the above article does confirm that flight at altitude is done with a sealed helmet and that pilots must remain alert, so I don't see how "sleeping" would ever be allowed. That plane is a bitch to fly. It's very unforgiving at altitude. The pilot that did the talk flew out of Scotland in the mid 1990's. I guess I misunderstood what opening a helmets face plate means. Your reference indicates a 14,000 foot cockpit pressure. He did say clearly that an auto pilot was used. It made mapping mission type ground tracks. I remember the comment that altitude control was by monitoring engine temperature. He also said that if you cannot land exactly balanced on the front dual wheels you need to look elsewhere for another assignment. |
#6
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Skin tight space suits ?
wrote:
On Thursday, July 27, 2017 at 7:17:03 AM UTC-4, Jeff Findley wrote: In article , says... You fart a lot when you go from 14.7 PSI to 5 PSI. They don't tell you this. I when to a talk by a U2 pilot once. As a data point, they did open the mask up at 70,000 feet as necessary. The aircraft was put on autopilot allowing sleeping time. Drinking and eating and nose scratching/puking were allowed. Obviously you misunderstood what was said, as usual, Dougie. There is no 'mask' on a U-2 suit. It's a hard helmet. They eat paste that is squirted in through a lock in the helmet. The original aircraft were pressurized to around 30,000 feet altitude equivalent, which means if you aren't in a sealed suit you die. U-2 started out as unpressurized http://www.lockheedmartin.com/us/new...U260Years.html But later, cockpit pressure was increased to the equivalent of about 14k feet, which is pretty thin. http://aviationweek.com/blog/what-do...ane-pilots-eat Still, the above article does confirm that flight at altitude is done with a sealed helmet and that pilots must remain alert, so I don't see how "sleeping" would ever be allowed. That plane is a bitch to fly. It's very unforgiving at altitude. The pilot that did the talk flew out of Scotland in the mid 1990's. Another thing you apparently misunderstood. No U-2 aircraft ever operated out of Scotland. http://www.ais.org/~schnars/aero/ol-det.htm I guess I misunderstood what opening a helmets face plate means. Your reference indicates a 14,000 foot cockpit pressure. I guess you did, since the faceplate is not intended to be opened by the pilot. -- "Ordinarily he is insane. But he has lucid moments when he is only stupid." -- Heinrich Heine |
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