TheSonntag
Topic Author
Posts: 4386
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How Many G's Are Usually Pulled In A Civil Flight?

When a civil airplane takes off and does not have to do maneuvers like avoiding collisions or avoiding colliding with mountains, how many G's are usually pulled in a "normal" flight. I guess its not very much, of course, but still I always feel as a passenger that I sometimes get lighter or heavier...

So how much is it usually, and what are limits that are used in flights with passengers?

Michael

SlamClick
Posts: 9576
Joined: Sun Nov 23, 2003 7:09 am

RE: How Many G's Are Usually Pulled In A Civil Flight?

For reference autopilots are commonly set to "quarter-G" pitch changes. That seems similar to what us corn-fed autopilots might do. So, say with no turbulence from 0.75 to 1.25G in a routine flight.

With turbulence that pilots would call moderate and passengers would call severe, maybe from 0.5 to 1.5G

Happiness is not seeing another trite Ste. Maarten photo all week long.

Starlionblue
Posts: 17896
Joined: Fri Feb 27, 2004 9:54 pm

RE: How Many G's Are Usually Pulled In A Civil Flight?

SlamClick has given operational limits. Airframe limits are of course much higher.

For the 340-300:
- clean configuration: +2.5 g to -1.0 g.
- flaps and/or slats extended: +2.0 g to 0 g.
Hard landing limits: More than +2.0 g or sink rate in excess of 10 ft/s (600 ft/min)
Source: http://www.sasflightops.com/

Obviously the plane would hold up to more, but you can see that you will never "pull Gs" as a pax.

Fighter pilots will pull 7 or 9 (in some planes) Gs as a matter of routine, but those pilots are used to it. For the untrained, 3-4 Gs is A LOT. I've experienced 5 once and I almost blacked out despite clenching and breathing properly.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo

Jetlagged
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RE: How Many G's Are Usually Pulled In A Civil Flight?

In a turn, typical maximum bank angle is 30 degrees, which for a level co-ordinated turn is approximately 1.15 g.
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PhilSquares
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RE: How Many G's Are Usually Pulled In A Civil Flight?

During a normal flight the "G" forces are really kept to a minimum. You most like experience more during the takeoff and landing than you do in flight.

For example a 30 degree bank turn, straight and level unaccelerated flight will produce 1.2 "G's", a 45 degree turn is 1.4 and a 60 degree is 2.0. Just as a point of interest a 9 g turn will result from a 84degree turn. Note, all are straight and level, unaccelerated flight.

So, you can see, excluding turbulence, the G force shouldn't be more than 1.2 G's.
Fly fast, live slow

Pyrex
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RE: How Many G's Are Usually Pulled In A Civil Flight?

I once pulled 1.8 g (several times) on an A300 doing parabolic flights (Zero-G) and I can tell you it is a strange feeling on such a large plane. I thought it would be easier to move (it isn't that much compared to fighter jets or extreme rollercoasters) but it wasn't.

I don't know the operational limits of the plane but if they are anything like Starlionblue's figures we were awfully close...
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TheSonntag
Topic Author
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RE: How Many G's Are Usually Pulled In A Civil Flight?

Ok thanks for your input... I really think 9Gs would not be good for me

Space Aircraft have 3gs for 20minutes, right?

Newark777
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RE: How Many G's Are Usually Pulled In A Civil Flight?

Just as a comparison, those amusement park rides that spin you around and pin you against the wall, they only go up to about 2G's.

Harry
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Pyrex
Posts: 4229
Joined: Thu Aug 25, 2005 7:24 am

RE: How Many G's Are Usually Pulled In A Civil Flight?

I thought the large roller-coasters went as high as 4-5 g (not continuous, obviously, just for brief moments). Thanks for the correction.

 Quoting TheSonntag (Reply 6):Space Aircraft have 3gs for 20minutes, right?

What do you mean by space aircraft? Space Shuttle and the like?
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SuperD
Posts: 88
Joined: Fri Oct 07, 2005 7:58 am

RE: How Many G's Are Usually Pulled In A Civil Flight?

 Quoting Pyrex (Reply 8):I thought the large roller-coasters went as high as 4-5 g

The highest Gs pulled on rollercoasters are somewhere between 5-6 Gs, but that's only for a nanosecond.

On a typical civilian flight, my vote is with:

 Quoting SlamClick (Reply 1):with no turbulence from 0.75 to 1.25G in a routine flight.

[Edited 2005-10-14 19:47:28]

TheSonntag
Topic Author
Posts: 4386
Joined: Wed Jun 15, 2005 7:23 pm

RE: How Many G's Are Usually Pulled In A Civil Flight?

 Quoting Pyrex (Reply 8): What do you mean by space aircraft? Space Shuttle and the like?

Yes, Space Shuttle, Saturn V, Soyus and craft like that

Starlionblue
Posts: 17896
Joined: Fri Feb 27, 2004 9:54 pm

RE: How Many G's Are Usually Pulled In A Civil Flight?

 Quoting Newark777 (Reply 7):Just as a comparison, those amusement park rides that spin you around and pin you against the wall, they only go up to about 2G's.

 Quoting Pyrex (Reply 8):I thought the large roller-coasters went as high as 4-5 g (not continuous, obviously, just for brief moments). Thanks for the correction.

 Quoting SuperD (Reply 9): The highest Gs pulled on rollercoasters are somewhere between 5-6 Gs, but that's only for a nanosecond.

"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo

jwenting
Posts: 9973
Joined: Mon Apr 23, 2001 10:12 pm

RE: How Many G's Are Usually Pulled In A Civil Flight?

Space Shuttle flight profiles are designed to not go over 3G continuous (maybe during turning maneouvres they go up a bit higher for a few seconds).

Saturn rockets went a lot higher. Not sure how much, but 6+G was likely the norm rather than the exception.
I wish I were flying

zvezda
Posts: 8891
Joined: Sat Aug 28, 2004 8:48 pm

RE: How Many G's Are Usually Pulled In A Civil Flight?

 Quoting Starlionblue (Reply 2):For the 340-300: Flight maneouvering load acceleration limits: - clean configuration: +2.5 g to -1.0 g. - flaps and/or slats extended: +2.0 g to 0 g. Hard landing limits: More than +2.0 g or sink rate in excess of 10 ft/s (600 ft/min) Source: http://www.sasflightops.com/ Obviously the plane would hold up to more, but you can see that you will never "pull Gs" as a pax.

 Quoting PhilSquares (Reply 4):For example a 30 degree bank turn, straight and level unaccelerated flight will produce 1.2 "G's", a 45 degree turn is 1.4 and a 60 degree is 2.0. Just as a point of interest a 9 g turn will result from a 84degree turn. Note, all are straight and level, unaccelerated flight.

I participated in the acceptance flight testing of an A319. We pulled +2.5g, -1.0g, and executed one 60 degree turn in each direction. I was in the left cockpit jumpseat at the time. I wouldn't mind doing it again.

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