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Dec 16, 2002, 12:59 AM
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gbruce's Avatar

Center of Gravity check ...please


I'm not sure if it's Dan or Daren, but I would really like one of those wonderful CofG checks superimposed on my bug as it has a little different wing than Kevins plans call for.

Thanks for your help!

I have checked it out for myself but would like a second opinion as the Test glides last year MAY have been done with the CofG a little to far aft, Pitched up and stalled twice..
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Dec 16, 2002, 10:51 AM
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Doc Watson's Avatar
10%MAC and 20% MAC along with the MAC shown

Its up to you where it goes, suggest 15% MAC to start

Doc
Dec 16, 2002, 11:22 AM
Ain't Dutch? Ain't Mutch!
Kimble_Schmitz's Avatar
Teach me please!

Need to know how you do this on curved wings using autocad.

I thought 23% MAC is normal, isn't it? Does this differ between planes? How about flying wings?

Please look in the Sniper thread and calculate the CofG of my E-vox flying wing, thank you.

Dec 16, 2002, 07:16 PM
Registered User
gbruce's Avatar
Thanks for the time you put in Doc.

A few Questions:

Doesn't the LEX effect this calculation at all??

I was thinking 23% like Kimble which basically put it where your NP is shown.

I am ,however, open to an education as far as the 10-15% that you are quoting

Thanks again.
Dec 16, 2002, 07:42 PM
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Kevin Cox's Avatar
Bruce,

Yes the LEX does change it a bit. If you do the calculation without it it will come up tail heavy. 17% sounds about right but I suggest that you use the image you posted and make a glider. This is how the KC Bug CG was determind and I will do it for my Super Bug too.

Good luck!
Dec 16, 2002, 08:08 PM
Registered User
He's right, it sure worked for my F-104.
Steve
Dec 16, 2002, 08:56 PM
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Daren's Avatar

Re: Center of Gravity check ...please


Quote:
Originally posted by gbruce
I'm not sure if it's Dan or Daren, but I would really like one of those wonderful CofG checks superimposed on my bug as it has a little different wing than Kevins plans call for.
Here's a quickie CG at 25%. Sorry I can't write more just now; holidays and all.

Daren
Dec 16, 2002, 09:12 PM
Registered User
gbruce's Avatar
You guys are really helpful!! Thanks!!

I pretty much have decided to start at 15% and go from there. I'll let you all know what happens if the weather doesn't go sour on me. Bungee launch emminent...



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