Help CG for flying wing thing  
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Help CG for flying wing thing - 2/13/2008 4:44:25 PM   
mrlogdog


 

Posts: 44
Joined: 1/20/2004
From: shelocta, PA, USA
Status: offline 		Does anyone have a formula for finding the CG of this thing? Sort of looks like one of the ships from the tv series, battlestar galaktica. Or even if anyone has a name, that might help me.

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RE: Help CG for flying wing thing - 2/13/2008 4:59:38 PM   
da Rock



Posts: 6707
Joined: 10/11/2005
From: western, NC, USA
Status: online 		Look at the recent thread: C.G. calculator

The 2nd or third post in it lists 4 online applications that take your measurements and spit back out a CG location. Two of them are worthwhile if you model has a "normal" tail. Two of them only use the wing measurements. They aren't of much value for a normal model, but would be great for a flying wing.

(in reply to mrlogdog)
       Post #: 2

RE: Help CG for flying wing thing - 2/13/2008 5:20:45 PM   
mrlogdog


 

Posts: 44
Joined: 1/20/2004
From: shelocta, PA, USA
Status: offline 		Thanks da rock,
I had seen those web sites and tried my figures. I don't have a tapered leading edge, rather a tapered trailing. Thanks

(in reply to da Rock)
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RE: Help CG for flying wing thing - 2/13/2008 6:48:57 PM   
BMatthews



Posts: 8951
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		Use a MAC (Mean Aerodynamic Chord) calculator to find the MAC and then put the CG at 18% of the MAC and just extend that to the wingtips so you know where to put your fingers.

Flying wings provide their own stability so you need to do the CG differently. On any flying wing under no circumstances should the CG ever go further back than around 23 to 27%. Even with that range the model would be pitch neutral. Further back than around 27% and it'll want to swap ends. Normal CG ranges for flying wings is around 18 to 22% of the MAC.


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to mrlogdog)
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