CG Formula

Heli_Jelly · 06-14-2012, 05:52 PM

Anyone

Beachcomber · 06-18-2012, 11:04 AM

The best CG (center of gravity) for airplanes is different for each plane design. Usually measured in inches behind the leading edge of main wing near the fuselage (body). See if you can find a thread on your specific plane in this or other forums (try goggle) to see what CG folks are using. Or maybe contact builder to see what is recommended.

marcoeldragon · 06-18-2012, 09:30 PM

On a conventional straight wing plane 1/3 of the way back from the leading edge is a good starting point. On swept wings or deltas or canards it is anybodies guess.

Heli_Jelly · 06-20-2012, 08:33 AM

Quote:

Originally Posted by marcoeldragon

On a conventional straight wing plane 1/3 of the way back from the leading edge is a good starting point. On swept wings or deltas or canards it is anybodies guess.

Thanks ... Yeah it's for a delta wing.... Trial and error I guess.

bradharvy · 06-20-2012, 09:26 AM

what kind of delta ya got?

Heli_Jelly · 06-21-2012, 09:15 AM

Quote:

Originally Posted by bradharvy

what kind of delta ya got?

I'll take a pic today and post it... First attempt resulted in mild success with the wing being very pitchy.
There's a seller on eBay that sells a power package for 18 bucks. It includes Esc,motor,prop and motor mount. Anyhow before I spend alot if time on a wing design I want to figure out this cg problem.

Pinecone · 06-26-2012, 09:53 AM

Best bet it so figure out where you think it should be, then move it forward.

Forward CG, plane flies poorly, but it flies.

Rearward CG, plane crashes.

Any questions?

06-14-2012, 05:52 PM	#1
Heli_Jelly Registered Users Join Date: Mar 2012 Location: Texas	CG Formula Anyone Last edited by Heli_Jelly; 06-16-2012 at 06:49 AM..

06-18-2012, 09:30 PM	#3
marcoeldragon Registered Users Join Date: Apr 2010 Location: USA, VA, Waynesboro	On a conventional straight wing plane 1/3 of the way back from the leading edge is a good starting point. On swept wings or deltas or canards it is anybodies guess. __________________ Blade mSR, UM T-28, Custom F-27C,SU-26xp, PZ Extra 300, 3DHS 48" Edge 540, Edge 540QQ, DX7S, DX6i Any landing you can taxi back from is a good landing!

06-20-2012, 09:26 AM	#5
bradharvy Registered Users Join Date: Mar 2011 Location: missouri, raymore	what kind of delta ya got? __________________ Happy flying To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. ....Brad BLADE 450Xx2,300X ,130X NEVER! McPX BRL, 120DO2s, McPX, Stryker , Edge 540qq,UMX BEASt, Crak Yakx2, YAK 55M 35CC,A.W. PRO 260 20CC,3dhs 330sc 57inch, extreme flight 300 60 inch, ALL ON MY JR9503

06-26-2012, 09:53 AM	#7
Pinecone Registered Users Join Date: Sep 2006 Location: Maryland	Best bet it so figure out where you think it should be, then move it forward. Forward CG, plane flies poorly, but it flies. Rearward CG, plane crashes. Any questions? __________________ Terry AMA#47402, IRCHA # 3395 Blade CP "Pro", Trex 450SE, PiccoZ, Quick of Japan EP8v2 EX, Hurricane 550, Hurricane 200, JR Vibe 50, Blade mCX, Bergen Intrepid Gasser, Pantera 50, Blade mSR, Novus CP

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06-18-2012, 11:04 AM	#2
Beachcomber Registered Users Join Date: Jan 2009 Location: Savannah, Ga	The best CG (center of gravity) for airplanes is different for each plane design. Usually measured in inches behind the leading edge of main wing near the fuselage (body). See if you can find a thread on your specific plane in this or other forums (try goggle) to see what CG folks are using. Or maybe contact builder to see what is recommended.