Author Topic: G Tolerance (Read 1482 times)

Puke · « **on:** December 18, 2002, 10:09:37 AM »

After seeing a little discussion on ch 1 regarding G tolerance and pilot death due to Gs, I did a quick search on the web. It seems the results published/posted can vary a little, but generally it appears as though an instantaneous pull of 12Gs is really nothing and is not life threatenint. Here is one paragraph I found during my search which I find interesting:

There is a very large
difference between continuous acceleration and very brief acceleration,
i.e. impacts, when it comes to human survival. A 20G impact is not even
particularly severe; parachute-opening shocks reach that level. John
Stapp survived 50G rocket-sled braking, with some injuries. My old copy
of NASA's "Bioastronautics Databook" says that the limit of survival for
impacts is circa 175-200G, with a footnote that any single number is
misleading because it depends on many factors.

Also, I found this chart on the same post:

Time (min)   +Gx   -Gx   +Gz   -Gz
.01 (<1 sec)   35   28   18   8
.03 (2 sec)   28   22   14   7
.1      20   17   11   5
.3      15   12   9   4.5
1      11   9   7   3.3
3      9   8   6   2.5
10      6   5   4.5   2
30      4.5   4   3.5   1.8

With a G-suit on (left columns), it seems the human can withstand 15 Gs for 30% of 1-minute. 20Gs for 6 seconds! Without a G suit, 14 Gs for 2 seconds.

[crud, the above table isn't transferring to here correctly]

{Source}
http://www.yarchive.net/space/science/g_tolerance.html

moot · « **Reply #1 on:** December 18, 2002, 10:18:34 AM »

Doesn't +-9G pass out the pilot for while? If so, look at it this way, if your glock by 12Gs or so passes you out for (relatively to dogfight scale) good, it's maybe the same as hitech saying he doesn't want the player spending time watching himself die.

AKS\/\/ulfe · « **Reply #2 on:** December 18, 2002, 10:42:50 AM »

Doesn't +-9G pass out the pilot for while?

9Gs constant.... not instataneously and highly unlikely "for a while"... simply because your heart is still working, just need the blood to return to your eye balls. I think it's -5Gs constant that will cause red outs.
-SW

Midnight · « **Reply #3 on:** December 18, 2002, 11:12:40 AM »

How many Gs can the aircraft pull?

I think the Instant Death by Gs is just a factor of the plane rippings its wings off and your dead anyway.

Widewing · « **Reply #4 on:** December 18, 2002, 12:58:13 PM »

Quote

Originally posted by Midnight
How many Gs can the aircraft pull?

I think the Instant Death by Gs is just a factor of the plane rippings its wings off and your dead anyway.

Well, we've gone over this several times. It's not airframe failure, it's death. People who have witnessed it say that the aircraft simply disappears. It's also aircraft specific. It happens to the Wildcats with great frequency, as one example. There are some guys who push their aircraft much harder than most. They are the ones most adversely affected by this bug, which did not exist before the second 1.10 patch.

My regards,

Widewing

vorticon · « **Reply #5 on:** December 18, 2002, 01:00:29 PM »

i know a guy who flys f15's and he claims that in one a person can survive a 12 g turn

and in the 163 the plane rips to shreds before your hit with the g's and if the plane doesnt your fuel will slosh and BOOOM

Swoop · « **Reply #6 on:** December 18, 2002, 01:02:55 PM »

Well I was in the arena when this conversation was just ending, the only thing I saw HT type on the matter was:

Didnt I just explain that?

Erm.....some of us missed it, could ya explain it again on the BBS pls?

Why insta death at 12G?

vorticon · « **Reply #7 on:** December 18, 2002, 01:05:49 PM »

insta death at 12g's because ww2 planes couldent take that kind of punishment even if the pilots could

Puke · « **Reply #8 on:** December 18, 2002, 02:21:56 PM »

Aircraft are generally rated to about 1.5 times the amount of max G that is stated. Thus, the Tomcat which is rated to 7.5 Gs can actually survive to 11.5Gs...they can survive more than that too depending on the circumstance. It's just any time the aircraft incurrs more than the rated max, it has to undergo inspection for cracks and things. Aircraft are pretty tough and for the most part we are talking about instantaneous G here, people. The millisecond you or your aircraft hits 12Gs does not mean it's the end of your life or your aircraft's structural integrity. If this 12G death thing is for gameplay, then that is fine and I have no qualms. If it's there because it's thought to simulate how it works in the real world, then it's wrong and no one should be upset about us bringing it to HTC's and people-in-general's attention.

As has been stated before, when you are walking around the house and trip and fall and your body stops its fall by hitting the ground, that is typically more than 9Gs. That's instantaneous though. If the floor kept pushing upwards like that, you could probably survive it without any damage (bloody eyes or blackout) for a few minutes.

I'm *guessing* that there is an insta-death at 12Gs because the game's data doesn't go beyond that or strange things start happening and so anything hitting 12Gs or more no matter how short of a time will go boom.

Widewing · « **Reply #9 on:** December 18, 2002, 02:38:17 PM »

Quote

Originally posted by vorticon
insta death at 12g's because ww2 planes couldent take that kind of punishment even if the pilots could

Many, if not most,COULD take 12g for short duration excursions. It takes time for materials to fail under load.

Grumman's F4F was so over-engineered that it could survive SUSTAINED (for as long as 15 seconds in some cases) loads in excess of 12g, without airframe damage. Grumman test pilot Corky Meyer has documented this in the pages of Flight Journal.

My regards,

Widewing

Ripsnort · « **Reply #10 on:** December 18, 2002, 02:40:54 PM »

Also, its been recently proven that women pilots can sustain higher G's than men, and I believe a woman holds the record for sustained G's in that NASA thingy that goes around and around.

Thats gotta hurt a few Male ego's.

Charon · « **Reply #11 on:** December 18, 2002, 02:47:12 PM »

Just to be clear, is this why I've seen some planes just suddenly disappear recently as noted in this post? I will let the experts debate the merits, but it would be nice to at least see an explosion so you know they didn't warp under you or something.

Charon

muckmaw · « **Reply #12 on:** December 18, 2002, 02:50:09 PM »

Quote

Originally posted by Ripsnort
Also, its been recently proven that women pilots can sustain higher G's than men, and I believe a woman holds the record for sustained G's in that NASA thingy that goes around and around.

Centrifuge?

Ferris Wheel?

Schlong?

Citabria · « **Reply #13 on:** December 18, 2002, 03:04:38 PM »

theres the proof from nasa HTC

its pretty damning and shows the AH 12g death is totally unrealistic.

moot · « **Reply #14 on:** December 18, 2002, 03:45:18 PM »

alright then what's the reason?