Apparently I don’t understand the center of gravity chart in the weight menu… I am using the 320 mod. and I try to have CG dead on center but obviously this is not always possible without taking an hour to move single pounds lol. My current flight is carrying 65,979 pounds of cargo (I use onair) and my CG is if I recall correctly 25.5% which was not dead center but pretty close. Yet my AOA at cruise is 41%…WHY? More weight further back is more nose up no? And more weight up front is more nose down? So if I am pretty close to dead center why is my AOA so high at cruise? What am I missing?
I’ll also add I started with 37% fuel, which has obviously burned a good bit and my AOA has for some reason dropped to 41%
Does 1/3 root chord sound reasonable?
What? IDK what that means lol
You don’t need the C of G in the exact center. You have a range and it says that on the Weight and Balance page. Think 16% to 40% not sure.
However since an aircraft uses fuel while flying and fuel is weight you need to make sure that your zero fuel weight has the aircraft still within the C of G limits. So set the max fuel and then reduce it to zero and see if you still have the C of G within the limits required, with the cargo/passengers you want to carry.
I just tried the A320 non mod with full fuel and some baggage to put the gross weight near the top limit. It really takes a long runway to takeoff.
Where do you see the 41% in AOA - I only see red/yellow and green on the outside view.
Don’t fly the A320 much.
Are you talking about trim. That has nothing to do with C of G. %MAC. The AP or you have trimmed the aircraft using 41% of the 100 % available.
The AOA in yellow is what you look at. Yellow is fine. Red is bad. Green is better.
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i tried playing with trim wheel but the AP kept putting it back to what it had it set to, so nothing i could do. is there a way to over ride AP on that without fully disengaging? why would AP have it set so high?
This is ASOBOs AP algorithm. Since the AOA is near the middle, just slightly low, it’s flying correctly for your specific configuration, fuel and cargo/passengers.
The AP uses trim and elevator to set the correct AOA for the most efficient flight configuration.
You can’t set the trim. The AP controls it. ( When the AP is on)
So…43% was technically correct or just correct according to Asobo math? Sounds like the latter.
Assuming 43% is the trim number, it means that the trim tab has been set to 43% of its full travel amount. In the case of the picture above its nose up.
In order to achieve straight level flight at that airspeed and power and weight the aircraft is set up with a slight nose high attitude.
The trim is set to 43 %. If the AOA was greater it would climb. If less it would descend. If you flew at a slower airspeed you would need more lift and that would need a higher AOA and hence a higher trim nose up. A higher airspeed would generate more lift than needed so a lower AOA is needed and the trim for nose up would need to be reduced lower than 43 %
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