View Full Version : Scuffs on new Acme prop

05-03-2017, 08:19 PM
I just got an acme 1617 and it has scuffs on two blades. I haven't seen this before, is it a remanufactured prop? weird place for repair but last 3 acme props looked normal. Any ideas?
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05-03-2017, 09:27 PM
Ok so looking online a little more makes it look like its where they "balanced" the prop.

05-04-2017, 11:27 AM
That is what I was going to suggest. They have some very serious balancing gizmos these days, better than the computerized balancer your tire installer uses. It will grind a little off to get it nearly perfect. Some outfits will give you a report showing it down to several decimals.

05-04-2017, 12:02 PM
Ok so looking online a little more makes it look like its where they "balanced" the prop
This is the correct answer...

05-04-2017, 12:17 PM
That is normal machine marks for the final balance at the factory. Rather than add weights like they do on vehicle wheels, they sand off material to achieve balance.

05-04-2017, 12:51 PM
Nice wheels have weights on the inside so it doesn't look like crap and you would think they could do their grinding on the back side. Why not make the blades smooth to begin with so grinding wouldn't affect the asthetics.

05-04-2017, 01:48 PM
These are cnc milled and not cast and there may be some science to the micro lines. However, what you call the "back side" os the prop, is in reality, the front side that meets the water first. This makes me believe there is a reason they polish on the trailing side of the blade, rather than the leading face.