RedHotPoker
Captain
Flight distance : 165105 ft
Canada
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There is no harm or danger, in a light sanding of your rotor blade, where I am mentioning it be done.
If you look closely at a Phantom 3 rotor blade, near the hub, you'll notice a tiny arrow, pointing in the direction, that particular blade should spin onto the motor shaft.
That arrow, is where the sanding I am referring to, is done. No part of the actual meat of the blade has been removed. ;-)
& therefor there is No real danger in this sanding method...
Paint yours if you choose. Personal preferences may, very well vary. Haha.
RedHotPoker
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