Active Active   Unanswered Unanswered

Propeller ID

Keeping your powerboat under power is a lot easier with good advice. Post your power systems questions here.

Moderators: Don Ayers, Al Benton, Don Vogt

Bill Darnaby
Posts: 14
Joined: Tue Jul 25, 2006 2:35 pm
Contact:

Propeller ID

Post by Bill Darnaby » Tue Jul 02, 2024 12:05 pm

Can anybody tell me the diameter and pitch of my prop? The marking are
530140 or 560140 or 580140. I say "or" because the second digit is ill-stamped and could be 3 or 6 or 8.

The other markings are, after turning the prop over, 8173 and 684 RH, for right hand, of course.

"Chris Craft" is on the hub.

Thanks, Bill.

User avatar
Captain Nemo
Posts: 737
Joined: Tue Jul 07, 2009 7:40 pm
Location: Lyons, NY
Contact:

Re: Propeller ID

Post by Captain Nemo » Wed Jul 03, 2024 10:45 am

684 says it's 12.5 x 13RH
Boats are to be made of wood, otherwise, God would have grown fiberglass trees.

Bill Darnaby
Posts: 14
Joined: Tue Jul 25, 2006 2:35 pm
Contact:

Re: Propeller ID

Post by Bill Darnaby » Wed Jul 03, 2024 11:36 am

Thanks! The entire engine and powertrain were recently rebuilt and I have reasons to suspect that I did not get my original 12 x 12 prop reinstalled. This confirms it.

Bill

Bill Darnaby
Posts: 14
Joined: Tue Jul 25, 2006 2:35 pm
Contact:

Was Propeller ID now correct propeller?

Post by Bill Darnaby » Wed Jul 03, 2024 1:13 pm

Ok...now that my suspicions about not having my original prop have been confirmed please allow me to expand on this and solicit opinions from those with more experience.

The boat is a 1955 18' Continental and the original K engine was replaced in the 1990's with a 283 by the person who restored it. The engine failed last summer which required a complete rebuild over the winter and spring. I also had it varnished but I digress. During rebuilding the 283 block was found to be cracked and the only replacement available was a 327 block so now the boat has a 327 engine. Before I conclude that the restoration shop made a mistake in replacing the 12 x 12 prop with a 12.5 x13 prop could the shop be thinking the larger prop is more appropriate for the 327 engine? By the way, he made no mention of replacing the prop. I just notice that there is more vibration at certain speeds and the way the boat immediately "bites" into the water when put into gear which made me suspect that the pitch is greater than I had before.

Thanks, Bill

User avatar
Captain Nemo
Posts: 737
Joined: Tue Jul 07, 2009 7:40 pm
Location: Lyons, NY
Contact:

Re: Propeller ID

Post by Captain Nemo » Wed Jul 03, 2024 5:05 pm

I didn’t know there was an engine swap. Go to Acme Propeller. They can determine a proper prop :lol: .
Boats are to be made of wood, otherwise, God would have grown fiberglass trees.

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests