Results 11 to 20 of 41
-
03-05-2009, 02:38 PM #11
Same for me, I double checked and the CG entry is empty, using 737-700 Opensky and S.Reyling 700.
It is an important data and no pertinent data to figure it.
FS9 fuel and payload window shows where the CG is on a rough little scale.
How to interpret it in % is a mystery to me.Jackpilot
B737-700 Posky
FS9/P.Magenta
without PMSystem
-
03-05-2009, 04:15 PM #12
- Join Date
- May 2008
- Location
- Earth
- Posts
- 288
That little scale shows you your MAC% although it doesn't say what it is. The more back it is the greater the Mac%. Because it is expressed as a percentage relative to the forward MAC limit. See the glossary item MAC.
And oops the formulae below was mixed up, but I corrected it.Fritz -> Helicopter Cockpit Builder
(FSX | TH2Go | Arduino | Air Manager Avionics | CNC)
-
03-05-2009, 06:28 PM #13
Well, I can follow that...BUT where can I get those numbers (except the gross weight)
for the simulated airplane.
JPJackpilot
B737-700 Posky
FS9/P.Magenta
without PMSystem
-
03-06-2009, 01:37 PM #14
- Join Date
- May 2008
- Location
- Earth
- Posts
- 288
I made a little example, hope it is clear. I can't still figure out where the AFT MAC setting comes from.
From aircraft.cfg:
Code:[WEIGHT_AND_BALANCE] station_load.0 = "170.0, 80.0, -2.0, 0.0, Pilot" //Weight (lbs), longitudinal, lateral, vertical positions from datum (feet) station_load.1 = "170.0, 80.0, 2.0, 0.0, Co-Pilot" //Weight (lbs), longitudinal, lateral, vertical positions from datum (feet) station_load.2 = "1250.0, 60.0, 0.0, 0.0, Crew" //Weight (lbs), longitudinal, lateral, vertical positions from datum (feet) station_load.3 = "5200.0 , 22.0, 0.0, 0.0, First Class" //Weight (lbs), longitudinal, lateral, vertical positions from datum (feet) station_load.4 = "11549.0 , 11.0, 0.0, 0.0, Business Class" //Weight (lbs), longitudinal, lateral, vertical positions from datum (feet) station_load.5 = "15305.0 , -22.0, 0.0, 0.0, Coach 1-16" //Weight (lbs), longitudinal, lateral, vertical positions from datum (feet) station_load.6 = "15305.0 , -38.5, 0.0, 0.0, Coach 16-29" //Weight (lbs), longitudinal, lateral, vertical positions from datum (feet) station_load.7 = "6000.0 , 47.0, 0.0, 0.0, Forward Cargo" //Weight (lbs), longitudinal, lateral, vertical positions from datum (feet) station_load.8 = "45000.0 , -67.0, 0.0, 0.0, Aft Cargo" //Weight (lbs), longitudinal, lateral, vertical positions from datum (feet) max_gross_weight = 656000 // (pounds) empty_weight = 314000 // (pounds) [airplane_geometry] wing_root_chord = 42.0 //Feet wing_pos_apex_lon = 15.0 //Feet, longitudinal distance from reference point, negative going aft
Now an example using the above weights and arms:
Moment = Weight x Arm
Code:Weight (lbs) Arm (ft) Moment (Lb*Ft) Pilot 170 80 13600 Co-Pilot 170 80 13600 Crew 1250 60 75000 First Class 5200 22 114400 Business Class 11549 11 127039 Coach 1-16 15305 -22 -336710 Coach 16-29 15305 -38.5 -589242.5 Forward Cargo 6000 47 282000 Aft Cargo 45000 -67 -3015000 TOTAL: 99949 -3315313.5 PAYLOAD 99949 (PILOTS, CREW, PAX and FREIGHT) EMPTY WEIGHT 314000 (empty_weight in [WEIGHT_AND_BALANCE]) ZERO FUEL WEIGHT 413949 (PAYLOAD + ZERO FUEL WEIGHT) FUEL WEIGHT 250000 (WEIGHT OF THE FUEL)
Here are the data needed to calculate the MAC%:
GROSS WEIGHT 663949 (WEIGHT OF AIRCRAFT BEFORE TAXIING)
TOTAL MOMENT -3315313.5 (MOMEMENT)
AFT MAC LIMIT 42.0 (wing_root_chord in [airplane_geometry])
FWD MAC LIMIT ??.?? (DO NOT KNOW WHERE THIS IS YET ???)
During a search I discovered this Take-Off & Landing Performance Calculation Tool: TopCat. TOPCAT Home page. It calculates the MAC% for you.Fritz -> Helicopter Cockpit Builder
(FSX | TH2Go | Arduino | Air Manager Avionics | CNC)
-
03-06-2009, 01:46 PM #15
That's why they pay dispatchers to do this stuff!
All you need to know is the %MAC from the dispatcher and look up the TO trim setting.Boeing Skunk Works
Remember...140, 250, and REALLY FAST!
We don't need no stinkin' ETOPS!
Powered by FS9 & BOEING
-
03-06-2009, 03:06 PM #16
Hi to all,
I can tell you how I procced with this problem.
1.) I start at parking position, with changing the payload and the fuel load depending the flight I want.
2.) I configure the flight route to FMC.
3.) At init ref page I inform the weights.
4.) The CG% is always 22 at me. I press the LSK to be reseted and I have only the squares.
5.) I open pmcheckfile and I type the offset 2EF8 8 getting the CG%.
6.) I enter the valve to pm cg% and I get the trim which I configure to aircraft.
With this way, I always can rotare the plane at VRotate speed and not before or after.
* I will build a small program today or later tommorow to read the aircraft weights, the CG% and the trim value. It will be for free. So it will really easy to run this proggram and get the values you want.
-
Post Thanks / Like - 6 Thanks, 0 Likes, 0 Dislikes
-
03-06-2009, 04:10 PM #17
- Join Date
- May 2008
- Location
- Earth
- Posts
- 288
Achilles,
thks for that one. That is a great solution.
At least I had lots of fun learning about the MAC% calculations. At least now I can calculate the missing FWD MAC LIMIT if the AFT MAC LIMIT is indeed the same as the wing_root_chord in [airplane_geometry].
Maybe TasKing or you can write a Gauge to show the CG%? That will be really cheating. No dispatchers needed thank you.Fritz -> Helicopter Cockpit Builder
(FSX | TH2Go | Arduino | Air Manager Avionics | CNC)
-
03-06-2009, 08:27 PM #18
Ok,
I uploaded a program I made. It is calling payload manager.
Works via fsuipc and wideclient. Reads the data from Fs and also the CG%.
http://www.mycockpit.org/forums/down...do=file&id=310
Options
Aircraft type
Flight number
Tail number
Airline name
Max Gross weight
Basic operating weight
Payload
Zero fuel load
Fuel weight
Total weight
CG%
CG% Fwd
CG$ Aft
Trim indicator as value.
Overload Warning.
If someone have any new ideas to add to this program just post it.
-
Post Thanks / Like - 3 Thanks, 0 Likes, 0 Dislikes
-
03-06-2009, 09:43 PM #19
- Join Date
- Feb 2007
- Location
- Brazil
- Posts
- 81
Thanks, any chance to use it with KG ?
-
03-06-2009, 11:45 PM #20
Kg.....? what's that...(lol)
Jackpilot
B737-700 Posky
FS9/P.Magenta
without PMSystem
Similar Threads
-
weight of things
By kermit in forum General Builder Questions All Aircraft TypesReplies: 0Last Post: 04-05-2011, 09:46 AM -
Payload manager
By PeterH in forum PM General Q & AReplies: 3Last Post: 04-21-2010, 05:00 AM -
Keeping the weight down
By Neil Hewitt in forum Where to Start Building a Home CockpitReplies: 0Last Post: 04-08-2010, 05:56 PM -
Payload manager
By AchillesP in forum General Builder Questions All Aircraft TypesReplies: 8Last Post: 05-17-2009, 11:02 AM -
Aircraft settings question
By Randy Eskow in forum PM General Q & AReplies: 0Last Post: 03-23-2006, 07:19 PM
Candid connections: Platform for casual relationships Live Women Prime Đ¡asual Dating
Super Đ¡asual Dating - Genuine...