Quote Originally Posted by WESTERNAERO View Post
I'm with you there. I've been trying to get the understanding of these materials out there.
I think I've brought this up a couple times too but i don't know if anyone is understanding this idea:
1. If the "run out" of the taper is not held to a very close tolerance there will be a whipping effect of the prop with one ear pushing harder than the other, in turn loading one side of the shaft.
2. Or if both ears are not delivering equal forward thrust then the shaft is feeling the same load.
The second is why I like the idea of a CNC prop. This manufacturing process will give you the closest to each ear supplying equal forward thrust.
Obviously the closer to perfect you can make anything the better off you'll be. But as you know, perfection isn't cheap. And since you're dealing with variables to begin with, does it really matter that much? Boats turn (normally lol) so that affects the loading on the prop. I'm sure the water conditions will also affect it.

The mass of such a small (relatively) prop spinning at fairly reasonable rpm most of the time, isn't all that great. If the prop was 10' in diameter and weighed 10,000lbs different story.

Not saying its ok to be sloppy, just saying perfection probably isn't necessary for 99% of the boats out there.