73" Yak - CG Measuring  
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All Forums >> RC Airplanes >> Giant Scale Aircraft - 3D & Aerobatic >> Quique's Aircraft Support >> 73" Yak - CG Measuring
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73" Yak - CG Measuring - 8/7/2006 12:43:49 PM   
Bob Pastorello



Posts: 5397
Joined: 2/23/2002
From: El Reno, OK, USA
Status: offline 		Being basically an incredibly-lazy modeler.... the wing tip referenced CG dimensions do NOTHING for me....so...

Insert the wing tube about 8" or so into a panel.
Using a LONG straightedge, align the edge with the wing tube.
Make a mark at the wing tip, and one at the root rib.
Now, measure for the 'wing tip' dimensions in the book, mark that at the tip. Measure the distance away from your "straightedge" mark.
Put a NEW mark at the root rib, the same distance.
You now have the CG reference at the wing root. Trust me - this works, and works well.... done it on LOTS of precision aerobatic airplanes.

Oh, to save you the trouble....

The STOCK REAR-MOST CG point is 6 3/4" AFT of Leading edge at the wing root (NOT the 'fuse root'), but ya'll can find that easy enough. The FORWARD CG is then 10mm forward of that, or a little over 6 5/16".

To get the "fuse root" location, use your straightedge to connect the tip and root marks, draw a line. Denatured alchohol removes marker on covering REAL well...

_____________________________

Bob Pastorello www.rcaerobats.net
Sponsored by RCGF Aero Products
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All Forums >> RC Airplanes >> Giant Scale Aircraft - 3D & Aerobatic >> Quique's Aircraft Support >> 73" Yak - CG Measuring
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