Smelly motor - how dangerous was this?

interesting to know what that sound is, I was wondering a bit myself. Btw the bird still flies on the same motor, I have had several long, programmed (Litchi) missions in low height over the sea without any incidents. I don't know when I should replace the props, though. Do they get "old" and "worn"? I'm guessing about 3-4 hours of flying on these props (since it's been a while since my last serious wipeout now).
 

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