Patrol flap hinge lugs

[Ed Welfred]

The Patrol flap and aileron hinge bearings are inserted into lugs that are welded onto the hinge weldment. Can someone tell me what the purpose is for the small 3/16 hole that is near the centre of the lug?

[sjt]

If you are building your hinges - on the patrol- double check the welding jig dimensions that are in the booklet that comes with the plans. I think that there is a dimension that needs to be changed.

As to the hole I have no idea, but I guess it saves weight. I myself made them out of 1018 cold rolled steel since I never found a source for 1020 steel. AviPro sells the bearings at a reasonable price.
stan
p284

[SC Patrol 253]

I wondered the same thing after making these parts.

[Mark Goldberg]

If you do not drill that hole like Bob recommends - when you weld them up you will see why the hole is called for. Mark

[SC Patrol 253]

I wondered if it was for welding heating....