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Old 07-31-2021, 06:53 PM
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Hydro Junkie
 
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I just checked the Sig web site and found the 120 has a wing area of 1205 square inches. By dividing that by the 81" span, I got 14.876 so I'd round it up to 15". That should get you into the ballpark. Now, you just need to figure out how much chord you want for your ailerons and you should be good to go