Flt Duty Xls. For Mac
I have many variables for the CG Calculation from aircraft.cfg and the calculated Total Weight and Total Arm for the B737-800 (FSX default).
Now the question is, what is the fsx ( or AirWrench ) internal formula for the CG % MAC value? I have tried a lot of formula find via Google. But I never have the same resulat as FSX or AirWrench ( B737-800 with EmptyWeight 35.95 % CG MAC).
Also I have try this formula in the AVSIM Documentation 'fs_flight_dynamics_v1.0' , but not with the same result as FSX or AirWrench.
As I understood in the 'flight dynamic document' is the challange to get the LEMAC ( leading edge MAC ). The basic formula for the CG % is:
Distance to CG - Distance to LEMAC = Distance CG to LEMAC
and
(Distance CG to LEMAC / MAC) * 100 = CG % MAC
For Example Default B737-800, variables given:
wing_span = 117.42 ft
wing_sweep = 27.2°
wing_root_chord = 21.0 ft
wing_area = 1344.0 ft
MAC 14.10 ft ( calculated, same result as AirWrench )
The Calculation:
OK 14,41 ft LEMAC, then I will calculate the CG % MAC from empty weight of the B737-800
Arm = 9 ft
Then the formula for CG% MAC: 9 ft - 14,41 ft = -5,41 ft
And: (-5,41 ft / 14,10 ft) * 100
= -38,64 CG % MAC
This result is not the same as FSX and AirWrench empty weight CG ( 35.95 % ).
Can anyone see the mistake in the calculation ? Thanks in advance for your help !
Best regards
Sebastian
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Jun 08, 2014 Hi, everyone. I am a flight dispatcher who is having difficulty with a Flight Duty Period tracking sheet. I need a formula which gives me the total duty time of a pilot in one single day, which is calculated by using the DUTY START time of first flight and DUTY END time of last flight in the same day. DUTY LIMIT Date Sector Flown Sched Dep Actual Dep DUTY START DUTY END Time NEXT DUTY START Remarks Off Station Flight No Note: 1. Personal Data 2. Excess Duty Data 3. Denied Rest Data 4. Excess Duty Form - View / Print Non Optg flight before/after optg flight (leave it blank if not required ) Reason for delay (leave it blank if not required.
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