This is the place where the majority of the warbird (aircraft that have survived military service) discussions will take place. Specialized forums may be added in the new future
Wed Nov 21, 2018 9:22 am
What are the black squares on the PV-1 wings?
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Wed Nov 21, 2018 11:43 am
At those locations are aerodynamic slots in the wing that keep the wing tips from stalling before the rest of the wing.
As to the dark (black) coloring, I don't know, but it seems possible that the slots are protected from icing with pneumatic boots just like the leading edges of the wings and tail.
C2j
Wed Nov 21, 2018 11:44 am
I wonder if it's just a different color paint where the slots are located?

Wed Nov 21, 2018 7:59 pm
Mike,
Looking at the two photos you posted above, I am more convinced it is de-icing boots. The top picture shows a wing with no de-icers and the bottom picture shows a wing with de-icers.
C2j
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