Global Aircraft -- Forum (loadsheet)

j0k3r [ joker0 ]

Posts: 7
First post: 2007-05-30
Join date: 2007-05-30
Location: Alabama, USA
Group: Newcomer

GAViCs: 0.10
GAC Cards: 0 cards

Subject: loadsheet

Post ID# 1281

Message Number 1
Date Posted: 30 May 2007, 10:32:54 PM

%MAC = ((H-arm-cg - H-arm-leading-age-of-MAC) / Length of MAC) * 100
I found this formula in airbus's weight and balance book.
ႈIs there anyone can explain about this mac formula?
Or, is there another formula?
How can I calculate %mac by weight and index?
What other constant values are needed in that formula?

This is another one from eloadsheet.net(computerized loadsheet calculator).
This is a js function.
function CalcMac(fIndex, lnWeight){
return MyRound((((fIndex-50) * 300000 / lnWeight + 1323.6 - 1258) / 327.8) * 100 );
}
If you don't know programming, plz juz point me out about values except fIndex and lnWeight.

I can calculate mac in manual system with trim chart.
But, I don't know how can I calculate without trim chart.
How can I get mac by calculating formula without trim chart?

Thanks in advance..

[ oxusaf ]

Posts: 72
First post: 2007-02-17
Join date: 2007-02-16
Location: California, USA
Group: Rookie

GAViCs: 97.50
GAC Cards: 0 cards

Subject: loadsheet

Post ID# 1283

Message Number 2
Date Posted: 31 May 2007, 10:39:56 AM

You may need to talk to an experianced loadmaster.

[ firstsgt_cap ]

Posts: 277
First post: 2007-05-21
Join date: 2007-05-21
Location: Illinois, USA
Group: Volunteer

GAViCs: 29.75
GAC Cards: 6 cards
  Total Value: 110.00 GAViCs
  Max Value: 20.00 GAViCs
  Avg Value: 18.33 GAViCs

Subject: loadsheet

Post ID# 1284

Message Number 3
Date Posted: 31 May 2007, 9:14:49 PM

Yes, talk to someone who you know is, positively, an experienced load master.

j0k3r [ joker0 ]

Posts: 7
First post: 2007-05-30
Join date: 2007-05-30
Location: Alabama, USA
Group: Newcomer

GAViCs: 0.10
GAC Cards: 0 cards

Subject: loadsheet

Post ID# 1286

Message Number 4
Date Posted: 31 May 2007, 9:59:33 PM

Copyright © The Global Aircraft Organization

thz 4 your suggest..
so, is there any an experianced loadmaster here?

thanks in advance..

[ oxusaf ]

Posts: 72
First post: 2007-02-17
Join date: 2007-02-16
Location: California, USA
Group: Rookie

GAViCs: 97.50
GAC Cards: 0 cards

Subject: loadsheet

Post ID# 1287

Message Number 5
Date Posted: 01 June 2007, 9:06:03 AM

Hey, found a site that should be perfect..... loadmasters.com. It is what it says, you should be able to find someone there that can help you better than we can.

j0k3r [ joker0 ]

Posts: 7
First post: 2007-05-30
Join date: 2007-05-30
Location: Alabama, USA
Group: Newcomer

GAViCs: 0.10
GAC Cards: 0 cards

Subject: loadsheet

Post ID# 1293

Message Number 6
Date Posted: 03 June 2007, 10:14:29 PM

Thanks oxusaf

[ oxusaf ]

Posts: 72
First post: 2007-02-17
Join date: 2007-02-16
Location: California, USA
Group: Rookie

GAViCs: 97.50
GAC Cards: 0 cards

Subject: loadsheet

Post ID# 1294

Message Number 7
Date Posted: 04 June 2007, 3:19:25 PM

Did that site help at all?

j0k3r [ joker0 ]

Posts: 7
First post: 2007-05-30
Join date: 2007-05-30
Location: Alabama, USA
Group: Newcomer

GAViCs: 0.10
GAC Cards: 0 cards

Subject: loadsheet

Post ID# 1299

Message Number 8
Date Posted: 10 June 2007, 11:18:08 PM

no, i can't use that site as need to pay. it's not free.
i can't get solve till now.
i m thinking about reverse engineering now.
to get a formula from trim chart.
not try to know how to draw that trim chart by which numbers. but, try to know how can i get formula by looking that trim chart.
i still would love to get help from someone who good at aircraft engineer.
almost of load master don't know how to draw that trim. they juz know how to put point(LIZFW, LITOW) on already existence trim chart. i think, aircraft engineer more know about my case than load master.

j0k3r [ joker0 ]

Posts: 7
First post: 2007-05-30
Join date: 2007-05-30
Location: Alabama, USA
Group: Newcomer

GAViCs: 0.10
GAC Cards: 0 cards

Subject: loadsheet

Post ID# 1307

Message Number 9
Date Posted: 13 June 2007, 6:09:46 AM

I got a clue.
I juz need H-arm in this formula. I've got other values from aircraft manual..
%MAC = ((H-arm-cg - H-arm-leading-age-of-MAC) / Length of MAC) * 100
but, i haven't finish reading munual.. i've had two manual books now for two aircraft type.

j0k3r [ joker0 ]

Posts: 7
First post: 2007-05-30
Join date: 2007-05-30
Location: Alabama, USA
Group: Newcomer

GAViCs: 0.10
GAC Cards: 0 cards

Subject: loadsheet

Post ID# 1349

Message Number 10
Date Posted: 05 July 2007, 10:13:44 PM

I've got solution. It's in aircraft manual.
Need to combine two formulas.