Should i be concerned about this????
I was testing props today on my OS55AX with a Weson Uk minipipe.
After running 11x6, 11x7, and 11x8 i was left with very dark burnt oil residue on the wing.
I've posted a couple of pictures below. The engine runs spot on in all was, but should i be concerned about the black colour of the residue??
Constructive opinions appreciated