okay:

1-9/16" thickness = 1.5625"

1.5625" thick at the spars--and a 10.5" cord--currently

1.5625/10.5 x 100 = 14.88

I want to change to:

1-5/16" thickness and 12.25" cord

1-5/16" thickness = 1.3125"

1.3125/12.25 x 100 = 10.71

So- If I did that right--then I'm going from a 14.88% thickness too a 10.71% thickness.