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Old 02-25-2004 | 01:35 PM
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FHHuber
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Default RE: determining the c/g pre-flight
www.nsrca.org has a trim test chart for Pattern models. (designed as close to 0 wing incidence, 0 decalage, 0 thrust offset as possible with symetrical airfoils) Thier chart is very good for getting the optimum performance from an aerobatic design.

The basic rule of thumb for a "conventional" design is... start at 25 to 27% MAC and work from there. 30 to 35% MAC isn't uncommon on Fun-Fly designs. (The MAC reference is... a line perpendicular to the fuselage with that percentage of the wing area ahead of the line)
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