Very informative so far...except for the OP...no one has answered his valid question.
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I disagree with you DW8. You don't need moisture to cause erosion of a props surface. Even in a dry atmosphere, there are always airborne impurities to erode the surfaces...I'm pretty sure you would agree with that. The point you make tho, that water is really destructive, is true....we all know that water is the only element that cannot be compressed.
I also disagree with the remark that "water looks like a splashy soft liquid but at high speed it is as solid as concrete." As a keen water skier, I will tell you that the concrete is softer!!!!
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Elaws post is interesting because it puts up some numbers to what is an acceptable balance.....from reading that (and not exploring the link at this time), there IS an acceptable out of balance parameter.
It might be that these parameters are merely for that maintenance company, but surely the manufacturers also have published limits.
It doesn't matter what the prop is made of, you spin it, it will erode. Balance a prop and only fly it in ideal conditions...no nicks for dressing etc..i.e perfect world.......I bet it doesn't balance the same after 500 hours.
Learning lots here
