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Old 07-01-2014, 11:53 AM
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JohnBuckner
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OK I am going to be very straight forward especially since your airplane is so simple with a rectangular wing and no sweep. First lets start out with it is normal for our airplanes ready to be flown but with no fuel in the tanks. Yes of couse CG will move forward with a full tank but protocol is to always express where the cg range or point should be flown with the Tank Empty.

Now if the manual says to balance the airplane at 4 1/8th aft of the leading edge and your airplane actually balances (with no fuel) at 4 1/2 then absolutely do not fly it there if you can,t move anything the yes use the lead. Often the guys will put the battery at the fornt wing bulkhead. If not put it forward directly behind the engine firewall. Along side or above, below the tank. Tank to big? get a smaller one.

If you suspect the manual information. Its so simple with your airplane to just measure the distance from the leading edge to the trailing edge and divide this distance by four and that will be the distance back from the leading edge of the wing that is the very best point to make your first flight and the airplane will be a buttercup hand down. This is also know a 25% MAC or in some circles the Quarter Chord.

John