Smitty's RV-9A from Van's Aircraft

RV-9A: Project Entry

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Dimpled and Countersinked the right HS ribs and spars
After drilling out the #40 holes in the skin into the ribs and spars, I took everything apart, then started dimpling the ribs, making sure that I didn't dimple everything, as the instructions stated. I ordered 3/32 small diameter female dimple die to dimple the ribs. The standard female dimple die is too wide and bends the flange out when making a dimple in the ribs. Then I used my microstop countersink to countersink the holes in the spars and the spar doublers. What to countersink in the doublers is very confusing. I finally read on the plans where it mentioned that all doubler countersinks are "forward" except for the ones that are "aft" on the rear span as indicated on the plans.

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