QANTAS747-438
Topic Author
Posts: 1656
Joined: Mon Jan 22, 2001 7:01 am

737-800 Weight And Balance

Tue Jun 04, 2013 5:23 pm

On a 737-800, If you were to take the OEW plus a fuel load of around 28.0 (no paxs or bags), where would the plane's center of gravity be? Would it be nose heavy or tail heavy? What about if that same plane had only 12.0 on the fuel (with no paxs or bags), how would that change things?
My posts/replies are strictly my opinion and not that of any company, organization, or Southwest Airlines.
 
AA737-823
Posts: 4888
Joined: Wed Mar 01, 2000 11:10 am

RE: 737-800 Weight And Balance

Fri Jun 07, 2013 7:29 pm

I don't have any numbers for you, but I CAN tell you that on ferry flights on -700s, the plane must be ballasted aft.
I would think the -800 would be similar, though not identical, in nature.
 
SKC
Posts: 157
Joined: Sat Oct 06, 2012 12:48 pm

RE: 737-800 Weight And Balance

Fri Jun 07, 2013 9:10 pm

Quoting AA737-823 (Reply 1):
I don't have any numbers for you, but I CAN tell you that on ferry flights on -700s, the plane must be ballasted aft.
I would think the -800 would be similar, though not identical, in nature.

If your -700s require ballast for ferry flights, it must just be due to configuration, as SWA doesn't.
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
AA737-823
Posts: 4888
Joined: Wed Mar 01, 2000 11:10 am

RE: 737-800 Weight And Balance

Sat Jun 08, 2013 8:36 pm

Quoting SKC (Reply 2):
If your -700s require ballast for ferry flights, it must just be due to configuration, as SWA doesn't.

Really? Hmm. Our are configured somewhat similarly to Southwest's... namely, all coach, 136 seats. Three lavs, no aft galley...
 
FlyASAGuy2005
Posts: 3964
Joined: Sun Sep 23, 2007 4:55 am

RE: 737-800 Weight And Balance

Sun Jun 23, 2013 5:07 am

Quoting QANTAS747-438 (Thread starter):

Hope this helps but in my experience, the 738 is usually loaded up front (bags) when its light (shorter flights say under 2 hours) and almost always loaded in the back on longer flights. On the -700 you can almost always get away with loading in the back regardless.

One of the reasons why I loved the '57. You could put 130 bags in the front or 130 bags in the back and it wouldn't make much of a difference.
What gets measured gets done.
 
User avatar
CrimsonNL
Posts: 1783
Joined: Wed Dec 05, 2007 6:34 pm

RE: 737-800 Weight And Balance

Wed Jun 26, 2013 11:03 am

Sorry for my late reply, I hope my answer is still of use to you. I created some fake flights in a loadcontrol system with 738's from 4 different airlines. All of them with a full economy config varying between 160-189 economy seats. With a take-off fuel of 28000 pounds I got the following MAC at TOW values for the 4 different aircraft. I won't specify the airlines but they are all European.

MAC at TOW
1: 19.81%
2: 22.13%
3. 20.17%
4. 21.16%

Martijn
Always comparing your flown types list with mine
 
QANTAS747-438
Topic Author
Posts: 1656
Joined: Mon Jan 22, 2001 7:01 am

RE: 737-800 Weight And Balance

Fri Jun 28, 2013 6:55 am

Quoting CrimsonNL (Reply 5):
Sorry for my late reply, I hope my answer is still of use to you. I created some fake flights in a loadcontrol system with 738's from 4 different airlines. All of them with a full economy config varying between 160-189 economy seats. With a take-off fuel of 28000 pounds I got the following MAC at TOW values for the 4 different aircraft. I won't specify the airlines but they are all European.

MAC at TOW
1: 19.81%
2: 22.13%
3. 20.17%
4. 21.16%

Thanks for the hard numbers. Could you explain in more depth what they refer to?
My posts/replies are strictly my opinion and not that of any company, organization, or Southwest Airlines.
 
FlyASAGuy2005
Posts: 3964
Joined: Sun Sep 23, 2007 4:55 am

RE: 737-800 Weight And Balance

Sat Jun 29, 2013 11:19 pm

Quoting QANTAS747-438 (Reply 6):
Thanks for the hard numbers. Could you explain in more depth what they refer to?

This is the aerodinamic chord if i'm not mistaken. When I use to be on the ramp, the software Delta uses for payload planning and loading (for ramp personnel not the stuff dispatchers use) would take the % and dumb it down for us to make practical sense.

Every a/c's chord is different so say on a 757 the chord "length" was so huge, it didn't really matter where you loaded the bags. The software ran a number between 1 and 99. 1 being the max nose heavy that you can be and 99 being the max tail hevy that you can be. In between this is your "safe" zone for the given chord for that a/c. A 757 loaded heavily forward on a standard run to Florida from Atlanta with full pax would be between 40 and 50. Loaded heavily aft and you're at 70-80.

On an MD88 however, the chord is much "shorter" and the Number is always very low due to the a/c being inherently nose-heavy when full. So if you fill up the back as much as possible at best you're getting a 30.

The numbers that crimsonNL posted is telling me that all those flights are fairly tail heavy.

[Edited 2013-06-29 16:20:19]
What gets measured gets done.
 
ferpe
Posts: 2651
Joined: Tue Nov 30, 2010 7:44 am

RE: 737-800 Weight And Balance

Sun Jun 30, 2013 3:08 am

Quoting FlyASAGuy2005 (Reply 7):
The numbers that crimsonNL posted is telling me that all those flights are fairly tail heavy.

No, they are pretty evenly loaded and if anything a bit nose heavy, typically a MAC table runs from 10% to 35% at the higher TOW weights, look in the 737 ACAP chapter 7.4.10.
Non French in France
 
FlyASAGuy2005
Posts: 3964
Joined: Sun Sep 23, 2007 4:55 am

RE: 737-800 Weight And Balance

Wed Jul 03, 2013 1:32 am

After posting I felt like I had it backwards but goes back to what I initially said.

Quoting FlyASAGuy2005 (Reply 4):
Hope this helps but in my experience, the 738 is usually loaded up front (bags) when its light (shorter flights say under 2 hours) and almost always loaded in the back on longer flights. On the -700 you can almost always get away with loading in the back regardless.
What gets measured gets done.

Who is online

Users browsing this forum: Baidu [Spider] and 14 guests