prop problems (Merged Threads & Posts)

Reply

  #1  
Old 05-24-06, 03:04 AM
Member
Thread Starter
Join Date: May 2006
Posts: 3
prop problems (Merged Threads & Posts)

Help I have 3.0 L mercuiser. 19 ft stingray I recently tuned up my engine and thought i would clean the prop up. I filed the edges to smooth out the dings and nicks now the boat sounds great but is 10 MPH slower did I change the performance of the prop
 

Last edited by davidroy; 05-24-06 at 07:59 PM.
Sponsored Links
  #2  
Old 05-24-06, 12:26 PM
Member
Join Date: Dec 2001
Posts: 2,538
probably filing on a prop probably isnt a good idea.
 
  #3  
Old 05-24-06, 08:05 PM
Member
Thread Starter
Join Date: May 2006
Posts: 3
Is my prop at fault ?

Help I have 3.0 L mercuiser. 19 ft stingray I recently tuned up my engine and thought i would clean the prop up. I filed the edges to smooth out the dings and nicks now the boat sounds great but is 10 MPH slower did I change the performance of the prop. anyone out there
 

Last edited by davidroy; 05-25-06 at 12:02 AM.
  #4  
Old 05-25-06, 12:07 AM
Member
Thread Starter
Join Date: May 2006
Posts: 3
anybody boat problem

--------------------------------------------------------------------------------

Help I have 3.0 L mercruiser. 19 ft stingray I recently tuned up my engine and thought i would clean the prop up. I filed the edges to smooth out the dings and nicks now the boat sounds great but is 10 MPH slower did I change the performance of the prop problem
 
  #5  
Old 05-25-06, 03:00 AM
Pwrbait
Visiting Guest
Posts: n/a
You changed it BIG TIME!! A prop is measured in size and pitch, such as 15X20. Which means it's 15 inches in diameter and has a 20 inch pitch. The pitch is the distanch the prop will travel forward (in inches) during one revolution. By filing the nicks out of your prop you've chanced the pitch. Not only will this cause you to go slower (or faster in some cases), but you've significantly changed the load placed on your engine and outdrive. Some props also have a cup or super cup put into the blade tips to improve performance depending on the size of boat and application. You need to take your prop to your loal prop shop to be reworked back to the original dimensions. More than likely it will be cheaper to have this done then to buy a new prop.
Chris
 
  #6  
Old 05-28-06, 10:00 AM
Member
Join Date: Nov 2004
Posts: 74
Prop?

A service man ground a lot off a prop for me years ago, after I hit a reef. About 1' or more all around about a 12" dia prop.
The loss of thrust area reduced speed and increased engine rpm - pointless effort since the prop was ruined anyway.
Removing nicks with a file without effecting angles of attack should not reduce speed.
I think you should look to your tuneup for the carb adjustment not correct, and swap with the spare prop to be sure.
 
  #7  
Old 05-28-06, 10:21 AM
Pwrbait
Visiting Guest
Posts: n/a
David, I posted this la few days ago when you asked about this.
Chris

You changed it BIG TIME!! A prop is measured in size and pitch, such as 15X20. Which means it's 15 inches in diameter and has a 20 inch pitch. The pitch is the distanch the prop will travel forward (in inches) during one revolution. By filing the nicks out of your prop you've chanced the pitch. Not only will this cause you to go slower (or faster in some cases), but you've significantly changed the load placed on your engine and outdrive. Some props also have a cup or super cup put into the blade tips to improve performance depending on the size of boat and application. You need to take your prop to your loal prop shop to be reworked back to the original dimensions. More than likely it will be cheaper to have this done then to buy a new prop.
Chris
 
  #8  
Old 05-31-06, 06:25 AM
Sharp Advice's Avatar
Admin Emeritus
Join Date: Feb 1998
Location: The Shake and Bake State USA
Posts: 10,440
Smile Forums Monitors Note

All prior posts on this subject have now been merged together.
Doing so keeps all exchanges of communications together for ease of following along. Kindly use the REPLY button to continue this thread (subject) until completion is accomplished.

Thanks
Web Site Host and Forums Monitor.
 
  #9  
Old 06-02-06, 09:56 PM
Ed Imeduc's Avatar
Member
Join Date: Aug 2002
Location: Mountain Williams Missouri
Posts: 18,389
Wink

What did the tack say in ####. Like said get a new prop the same size and pitch. If it tacked out ok and did the job for you when you ran the boat.

ED
 
  #10  
Old 06-05-06, 03:47 AM
harveje's Avatar
Member
Join Date: Jan 2006
Location: North East Ms.
Posts: 122
My 90 3.0 WOT is 44-46K with a 3 blade Al. 19 P I'm in the range and about 42 MPH loaded. With a 4 blade AL 18P in the range and 35-37 MPH loaded.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes