taguilo
Posts: 73
Joined: Tue Aug 02, 2005 7:51 am

757 Typical MAC % Numbers

Mon Aug 07, 2006 12:30 am

Hi All,

Does anyone recall what is a typical MAC percent for a full loaded 757 aircraft, pax version and/or cargo version; and how many units of trim are needed for TO ?

Thank you

Tom
 
SNA350
Posts: 123
Joined: Fri Dec 30, 2005 4:19 pm

RE: 757 Typical MAC % Numbers

Wed Aug 09, 2006 5:45 pm

MAC can vary from 13 to 30% when fully loaded
the trim units are 6.75 and 3.75 respectively

these are affcourse the limits for take off, I don't think a plane will fly like that
Aircraft flown: B733, B734, B736, B737, B738, B744, B752, B763, B772, A319, A320, A321, A343, A346, Do328, CRJ7, E190
 
taguilo
Posts: 73
Joined: Tue Aug 02, 2005 7:51 am

RE: 757 Typical MAC % Numbers

Wed Aug 09, 2006 8:15 pm

Quoting SNA350 (Reply 1):
MAC can vary from 13 to 30% when fully loaded
the trim units are 6.75 and 3.75 respectively

these are affcourse the limits for take off, I don't think a plane will fly like that

Thank you for the info!

Regards,
Tom
 
lehtora1
Posts: 8
Joined: Sat Feb 19, 2000 8:07 am

RE: 757 Typical MAC % Numbers

Fri Aug 11, 2006 9:24 pm

Hi,
I checked few charter flights from HEL to mediterranean destinations.
They had pax onboard between 190-220, and TOW was between 93-96 tons. ZF MAC was between 20-24%, TO MAC between 23-26% and trim units between 3.7-4.1 degrees.
Hope this helps you.
 
taguilo
Posts: 73
Joined: Tue Aug 02, 2005 7:51 am

RE: 757 Typical MAC % Numbers

Sun Aug 13, 2006 8:32 am

Quoting Lehtora1 (Reply 3):
Hi,
I checked few charter flights from HEL to mediterranean destinations.
They had pax onboard between 190-220, and TOW was between 93-96 tons. ZF MAC was between 20-24%, TO MAC between 23-26% and trim units between 3.7-4.1 degrees.
Hope this helps you.

Yes, it helps me a lot. Many thanks  Smile

Tom
 
LAXintl
Posts: 20183
Joined: Wed May 24, 2000 12:12 pm

RE: 757 Typical MAC % Numbers

Sun Aug 13, 2006 1:23 pm

As far as loading the B757 plan bags in aft compartment 3 first. Depending on the type of flight and passenger load very often near all the baggage will fit into 3.
After that plan compartment 4 and 2, but this is somewhat dependant if you have a 2-class aircraft aircraft or an all economy aircraft. If all economy than having all baggage in 3&4 and forward compartments empty will work.
From the desert to the sea, to all of Southern California
 
OldAeroGuy
Posts: 3185
Joined: Sun Dec 05, 2004 6:50 am

RE: 757 Typical MAC % Numbers

Tue Aug 15, 2006 12:51 am

Quoting SNA350 (Reply 1):
MAC can vary from 13 to 30% when fully loaded
the trim units are 6.75 and 3.75 respectively



Quoting Lehtora1 (Reply 3):
They had pax onboard between 190-220, and TOW was between 93-96 tons. ZF MAC was between 20-24%, TO MAC between 23-26%

MAC is the Mean Aerodynamic Chord. It will not vary no matter how the airplane is loaded.

What you all are describing is the CG position in terms of % MAC.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
taguilo
Posts: 73
Joined: Tue Aug 02, 2005 7:51 am

RE: 757 Typical MAC % Numbers

Wed Aug 16, 2006 12:41 am

Quoting OldAeroGuy (Reply 6):
MAC is the Mean Aerodynamic Chord. It will not vary no matter how the airplane is loaded.

What you all are describing is the CG position in terms of % MAC.

Yes, that's it. I guess we all in this thread know that, so use the adopted common expression "% MAC" instead of the proper one. Anyway, thank you for pointing out the difference  Smile

Tom
 
SNA350
Posts: 123
Joined: Fri Dec 30, 2005 4:19 pm

RE: 757 Typical MAC % Numbers

Wed Aug 16, 2006 1:41 am

Quoting OldAeroGuy (Reply 6):
MAC is the Mean Aerodynamic Chord. It will not vary no matter how the airplane is loaded.

What you all are describing is the CG position in terms of % MAC.

thanks didn't know that
Aircraft flown: B733, B734, B736, B737, B738, B744, B752, B763, B772, A319, A320, A321, A343, A346, Do328, CRJ7, E190

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