Maximum rate of descent?

[dallas]

Archived from groups: alt.games.microsoft.flight-sim (More info?)

"Roger"
> At altitude you have about 10 to 20 seconds of consciouness with a
> complete loss of pressure without supplemental Oxygen.

I used to be able to hold my breath for a couple of minutes, how come you
run out in 10 seconds.

I guess you exhale because you don't know you need to hold it in?


Dallas

 

[Guest]

Archived from groups: alt.games.microsoft.flight-sim (More info?)

Hi Tom Gibson,

Thanks for that info'.

I wonder if any of the Pilots got zapped due to mechanical failures, due
to shock cooling, which I'm guessing they didn't know about then?

Regards,
John Ward
"Tom Gibson" <tgibson@removethissunstroke.sdsu.edu> wrote in message
news:df2pge$gss$1@gondor.sdsu.edu...
> Hi,
>
> You can definitely shock cool them. They use (among other engines) the
> R-2800 which is the same as in the DC-6. My DC-6 flight manual says not
> to reduce the MAP on descent more than 3" per minute.
>
> Now I assume that the WWII fighters were a lot tougher on their engines
> than that, but if you shock cool an engine really badly, you are risking a
> blown cylinder or worse.
>
> Hope this helps,
>
> Tom Gibson
>
> Cal Classic Propliner Page: http://www.calclassic.com
>
> Cal Classic Alco Page: http://www.calclassic.com/alco
>
> Freeflight Design Shop: http://www.freeflightdesign.com
>
>
> John Ward wrote:
>> And, additionally, what are the implications re such WWII radial engine
>> planes as the Fw 190, and P-47 Thunderbolt?
>>
>> JW
>> "Dallas" <Cybnorm@spam_me_not.Hotmail.Com> wrote in message
>> news:vARPe.2609$z2.1301@newsread3.news.pas.earthlink.net...
>>
>>>"S Herman"
>>>
>>>>Another good reason is to prevent "shock cooling",
>>>
>>>Hey, how'd you learn so much about aviation on a tuna boat?
>>>
>>>
>>>Dallas
>>>
>>>
>>
>>

 

[Roger]

Archived from groups: alt.games.microsoft.flight-sim (More info?)

On Wed, 31 Aug 2005 08:26:50 -0400, Beech45Whiskey <pjricc@gmail.com>
wrote:

>Dallas <Cybnorm@spam_me_not.Hotmail.Com> wrote:
>
>> I used to be able to hold my breath for a couple of minutes, how come you
>> run out in 10 seconds.
>
>According to those who have participated in high-altitude chamber lessons,
>they claim that the drastic change in air pressure will force all of the
>air out of your lungs and that there will be none left for you to hold. At
>that point you have about 10 seconds to put on supplimental O2 before
>passing out.

The lungs absorb Oxygen, but lose that ability when the partial
pressure drops below the equivalent of about 25,000 feet. That is why
they have masks to provide pressure.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

 

[dallas]

Archived from groups: alt.games.microsoft.flight-sim (More info?)

"Roger"
> The lungs absorb Oxygen, but lose that ability when the partial
> pressure drops below the equivalent of about 25,000 feet. That is why
> they have masks to provide pressure.

Well, now that I think about it, that makes sense.

Let me make sure I understand, you telling me that the pilots masks provide
strong positive pressure? By that I mean, they have strong straps to press
them onto the face and "inflate" the lungs?

I always thought they just provided O2 at a gentle pressure. i.e. Just
filling the mask with O2.

The passenger's masks clearly can't do that because they just have a
"rubber-band" securing them to the face. And, I heard somewhere that
passengers don't get pure O2. Is that true?

Dallas