757-200 Center of gravity

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757-200 Center of gravity

Postby Frozen1 » Tue Oct 13, 2009 4:40 pm

For some reason my 757 C/G is all the way in the nose. The plane is flying nose down. Is this a panel issue?

Thanks
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Re: 757-200 Center of gravity

Postby garymbuska » Tue Oct 13, 2009 9:40 pm

For some reason my 757 C/G is all the way in the nose. The plane is flying nose down. Is this a panel issue?

Thanks

Now I ask you how in gods green earth would the panel cause this kind of problem.
Your problem could be one of two places. If the model was made that way there is not a whole lot you can do to fix it. But usually adjusting the weight and balance in the aircraft cfg file will solve this problem.
Just make sure you make gradual changes as you could get tail heavy in a hurry.
Last edited by garymbuska on Tue Oct 13, 2009 9:41 pm, edited 1 time in total.
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Re: 757-200 Center of gravity

Postby Capt.Propwash » Wed Oct 14, 2009 1:20 pm

you will need a pair of Tin Snips, Wire Strippers / cutters, a Sawz-all, and a few screw drivers, a 3lb sledgehammer, and a 20lb sledgehammer.

first off, use the sawz-all to neatly cut the panel on both ends (right and left) then the top near the windshield and once more underneath.

once you have done this, use the screwdrivers to unbolt any wires that you can get to, and the wire cutters or Tin snips to cut the wires that you can not unbolt.

using the sledgehammers, beat the ever living crap out of the panel until it pops loose.
Last edited by Capt.Propwash on Wed Oct 14, 2009 1:22 pm, edited 1 time in total.
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Re: 757-200 Center of gravity

Postby 757200ba » Wed Oct 14, 2009 8:48 pm

Are you sure is a CG problem?Or it could be a trim thing?
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Re: 757-200 Center of gravity

Postby Jersey Flyer » Wed Oct 14, 2009 8:49 pm

How much does your Co-Pilot weigh?
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Re: 757-200 Center of gravity

Postby N. Chapman » Wed Oct 14, 2009 8:57 pm

Generally the weight and balance is all in the Aircraft.cfg not a panel issue.
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Re: 757-200 Center of gravity

Postby gypsymoth » Thu Oct 15, 2009 6:07 am

Last edited by gypsymoth on Thu Oct 15, 2009 6:16 am, edited 1 time in total.
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Re: 757-200 Center of gravity

Postby microlight » Thu Oct 15, 2009 11:27 am

Location of CofG in the nose like this is a flight dynamics design issue. Just as gypsymoth says, increasing the positive number will move the CofG backwards. Usually it doesn't have an effect on nose-down, which can be addressed by adjusting the cruise_lift_scalar parameter in [flight_tuning] (lowering the number, often below 1 to 0.9 or lower, will raise the nose as the winglift is incrementally decreased).

A CofG that's too far forward will have the effect of making the plane fly like a shuttlecock; pitching, rolling and yawing around a point that's artificially too far forward. Likewise for the tail if it's too far back. It can be noticeable on rotation or landing where the main wheels can partially disappear into the tarmac as the plane pitches around the nose rather than normal CofG which is around a 0.3 wing chord, waterline, centreline.

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Re: 757-200 Center of gravity

Postby Frozen1 » Sat Oct 17, 2009 10:03 am

Thanks for the help but...It seems all of my Add-on A/C have the same problem. I downloaded them from Posky and have been using them for years. I never mess with the A/C cfg, I just add a panel and go. Don't know what happened.
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Re: 757-200 Center of gravity

Postby gypsymoth » Sun Oct 18, 2009 3:31 am

"all of my Add-on A/C have the same problem" sounds a trifle
odd.
Last edited by gypsymoth on Sun Oct 18, 2009 3:32 am, edited 1 time in total.
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