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757 Typical MAC % Numbers  
User currently offlineTaguilo From Argentina, joined Aug 2005, 74 posts, RR: 0
Posted (8 years 4 weeks 7 hours ago) and read 2770 times:

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

8 replies: All unread, jump to last
 
User currently offlineSNA350 From Belgium, joined Dec 2005, 129 posts, RR: 0
Reply 1, posted (8 years 3 weeks 4 days 14 hours ago) and read 2716 times:

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
User currently offlineTaguilo From Argentina, joined Aug 2005, 74 posts, RR: 0
Reply 2, posted (8 years 3 weeks 4 days 11 hours ago) and read 2701 times:

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


User currently offlineLehtora1 From Finland, joined Feb 2000, 9 posts, RR: 0
Reply 3, posted (8 years 3 weeks 2 days 10 hours ago) and read 2644 times:

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.


User currently offlineTaguilo From Argentina, joined Aug 2005, 74 posts, RR: 0
Reply 4, posted (8 years 3 weeks 23 hours ago) and read 2590 times:

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


User currently offlineLaxintl From United States of America, joined May 2000, 25198 posts, RR: 48
Reply 5, posted (8 years 3 weeks 18 hours ago) and read 2576 times:

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
User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3509 posts, RR: 66
Reply 6, posted (8 years 2 weeks 6 days 7 hours ago) and read 2509 times:

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
User currently offlineTaguilo From Argentina, joined Aug 2005, 74 posts, RR: 0
Reply 7, posted (8 years 2 weeks 5 days 7 hours ago) and read 2471 times:

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


User currently offlineSNA350 From Belgium, joined Dec 2005, 129 posts, RR: 0
Reply 8, posted (8 years 2 weeks 5 days 6 hours ago) and read 2469 times:

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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