If you have a chance of hitting something w/ your prop, then definitely stainless. Since it is stiffer, then any resistence it hits will go directly to the hub, so I'm sure it would be more susceptable to hub blowing, BUT an alumuinum prop is more susceptable to having a blade bent or broken on impact. So really, its a trade-off. I'll take better milage/speed and stronger prop blades over the chance of a blown hub.
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