Why is that? Can I improve it?TBD.skp (1.7 MB)
Turn on the display of hidden geometry (View menu) and see what edges correspond to the shading discontinuities. Also, are there interior faces branching off of the discontinuities, or are some faces reversed?
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Delete the extra geometry
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Whoa, cool! That’s what I call attention to detail! I love how Sketchup is teaching me to look and draw more carefully. Thank you very much for pointing out where I need to improve. 
I had to look it up. No, I think it isn’t a Brewster.
It’s going to be a Douglas TBD Devastator 