Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
How Many G's Are Usually Pulled In A Civil Flight?  
User currently offlineTheSonntag From Germany, joined Jun 2005, 3559 posts, RR: 29
Posted (8 years 10 months 1 week 4 days 21 hours ago) and read 13254 times:

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

13 replies: All unread, jump to last
 
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 1, posted (8 years 10 months 1 week 4 days 21 hours ago) and read 13258 times:

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

That's about my guess.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17014 posts, RR: 67
Reply 2, posted (8 years 10 months 1 week 4 days 8 hours ago) and read 13137 times:

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

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.

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."
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2546 posts, RR: 24
Reply 3, posted (8 years 10 months 1 week 4 days 7 hours ago) and read 13117 times:

In a turn, typical maximum bank angle is 30 degrees, which for a level co-ordinated turn is approximately 1.15 g.


The glass isn't half empty, or half full, it's twice as big as it needs to be.
User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 4, posted (8 years 10 months 1 week 4 days 7 hours ago) and read 13113 times:

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.


User currently offlinePyrex From Portugal, joined Aug 2005, 3974 posts, RR: 28
Reply 5, posted (8 years 10 months 1 week 4 days 6 hours ago) and read 13085 times:

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...



Read this very carefully, I shall write this only once!
User currently offlineTheSonntag From Germany, joined Jun 2005, 3559 posts, RR: 29
Reply 6, posted (8 years 10 months 1 week 4 days 5 hours ago) and read 13057 times:

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

Space Aircraft have 3gs for 20minutes, right?


User currently offlineNewark777 From United States of America, joined Dec 2004, 9348 posts, RR: 30
Reply 7, posted (8 years 10 months 1 week 4 days 5 hours ago) and read 13051 times:

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



Why grab a Heine when you can grab a Busch?
User currently offlinePyrex From Portugal, joined Aug 2005, 3974 posts, RR: 28
Reply 8, posted (8 years 10 months 1 week 4 days 5 hours ago) and read 13042 times:

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?



Read this very carefully, I shall write this only once!
User currently offlineSuperD From , joined Dec 1969, posts, RR:
Reply 9, posted (8 years 10 months 1 week 4 days 4 hours ago) and read 13018 times:

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]

User currently offlineTheSonntag From Germany, joined Jun 2005, 3559 posts, RR: 29
Reply 10, posted (8 years 10 months 1 week 4 days 1 hour ago) and read 12965 times:

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


User currently offlineStarlionblue From Greenland, joined Feb 2004, 17014 posts, RR: 67
Reply 11, posted (8 years 10 months 1 week 3 days 23 hours ago) and read 12925 times:

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.

Exactly. About 2 sustained. About 5-6 momentaneous.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineJwenting From Netherlands, joined Apr 2001, 10213 posts, RR: 18
Reply 12, posted (8 years 10 months 1 week 3 days 15 hours ago) and read 12863 times:

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
User currently offlineZvezda From Lithuania, joined Aug 2004, 10511 posts, RR: 64
Reply 13, posted (8 years 10 months 4 days 10 hours ago) and read 12616 times:

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.  Smile


Top Of Page
Forum Index

Reply To This Topic How Many G's Are Usually Pulled In A Civil Flight?
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
How Many Years For A B732 In Service posted Mon Feb 9 2004 16:20:31 by HAWK21M
How Many Miles Of Wiring In A Plane? posted Thu Feb 21 2002 01:15:28 by Arsenal@LHR
Flight Engineers, How Important Are They posted Fri Dec 23 2005 19:30:50 by Aileron11
How Many Flight Hours? posted Fri Dec 9 2005 16:03:50 by Pavlin
How Many Times Can A Pilot Fly A Plane In 1 Day? posted Fri Aug 5 2005 08:42:26 by Palladium
How Many Big Sonic Airplanes Were Built In US? posted Fri Feb 11 2005 22:03:38 by Lehpron
How Many 0xygen Mask Are On Airbuses, 757's Etc posted Wed Mar 24 2004 11:31:51 by XJFA
How Many „g´s“ Does A Civil Airliner Withstand? posted Sun Dec 28 2003 23:44:40 by Peterk
How Many USG In A LB Of Fuel? posted Tue Apr 15 2003 19:39:39 by LanPeru
How Many Gallons In A Pound(lb) Of Fuel? posted Sun Sep 8 2002 08:01:40 by LanPeru

Sponsor Message:
Printer friendly format