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Center of gravity (Read 2782 times)

p1muserfan Full Member Offline Posts: 8 Joined: Dec 22^nd, 2008	Center of gravity May 22^nd, 2009 at 2:30pm	Print Post
	Hope I'm wrong, but there still isn't any utility or chart for figuring C/G, is there? Default 27% on CDU never changes no matter what weight is entered. That is cruise CG anyway. Don't want to have to take-off with full fuel every flight, tired of guessing what the stab trim should be. Anybody?


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jerooum Full Member Offline Posts: 15 Joined: Dec 15^th, 2006	Re: Center of gravity Reply #1 - May 22^nd, 2009 at 6:57pm	Print Post
	Have the same problem. In addition, using a normal 757 TO CG setting with the appropriate trim, on TO with hands off, the aircraft rotates before VR and gently sets itself into a climb {almost like an auto-TO}. Very nice but not what real aircraft do. The only way I can achieve a TO where I have to physically rotate at the correct speed is to set the trim at 3.25 or less - and then TO with a Stabilizer warning on the ECAM. Grateful for advice on how to TO properly. John R


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rupesh Full Member Offline Posts: 88 Joined: Jan 2^nd, 2009	Re: Center of gravity Reply #2 - May 22^nd, 2009 at 6:57pm	Print Post
	u can try the fuel and load planning tab in fs. the aircraft view from the top down with the crosshair will tell you the CG. count the bars from the top (there are 33 in all) and see where the crosshair is then calculate the percentage and u should have it fairly accurate i think. eg* 16(the bar where the crosshair is) * 100 / 33(total # of bars)=48.48.. this is the cg u will use in flight and to set the stab trim in addition u will also need the ZFW and all the goodies which can b found here. happy flying


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SIR_PAGANINY Full Member Offline thrust level set, V1, Rotate, V2 Posts: 89 Location: Porto, Portugal Joined: Oct 30^th, 2008 Gender:	Re: Center of gravity Reply #3 - May 22^nd, 2009 at 8:17pm	Print Post
	p1muserfan you may be mistaken as the 27% you speak about is NOT actually the CG... that is on "take Off" and usually it is always between 44-47% and yes there you can insert the right value... as for getting this info accurately, Fspassengers will tell you everything you need right after loading all passengers, cargo and fuel... it will also tell you the ZFW.. everything together in a report! very good! and this add-ons is not expensive at all for what it worth's... otherwise try what Rupes's idea.


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SIR_PAGANINY Full Member Offline thrust level set, V1, Rotate, V2 Posts: 89 Location: Porto, Portugal Joined: Oct 30^th, 2008 Gender:	Re: Center of gravity Reply #4 - May 22^nd, 2009 at 8:26pm	Print Post
	jerooum wrote on May 22^nd, 2009 at 6:57pm: Have the same problem. �In addition, using a normal 757 TO CG setting with the appropriate trim, on TO with hands off, the aircraft rotates before VR and gently sets itself into a climb {almost like an auto-TO}. Very nice but not what real aircraft do. The only way I can achieve a TO where I have to physically rotate at the correct speed is to set the trim at 3.25 or less - and then TO with a Stabilizer warning on the ECAM. Grateful for advice on how to TO properly. John R Notice that the stab trim meter disagrees when you do mouse over right in the trim... as for my experience the correct valor is the one you get after set the mouse over stab trim meter... and a 45% CG will give you 1.00 Stab Trim.... This will make your airplane take off by itself right at VR... for that reason i always set one digit less... as for instance if FMC tells me i should set 2.00 i will set 1.00.


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