Go Back  Offshoreonly.com > Technical > Prop Talk
Prop slip?? >

Prop slip??

Notices

Prop slip??

Old 07-21-2011, 01:29 PM
  #1  
Registered
Thread Starter
 
Join Date: Oct 2008
Location: Toms River, NJ
Posts: 617
Likes: 0
Received 0 Likes on 0 Posts
Default Prop slip??

Hey guys, wondering if my x-dem is to high on my 1984 wellcraft excalibur. Here is what I have....
5,300rpm, 1.50 gear ratio bravo one drive, 28P bravo one prop, 75mph gps. I came up with 20% prop slip. My X-dem is 19.5in and the prop shaft center line is only 2 3/8in below the bottom of the V. Should I put a spacer between the upper and lower unit to get the prop down more in the water?
Thanks
Erik
crapr6 is offline  
Old 07-21-2011, 02:46 PM
  #2  
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha/LOTO
Posts: 19,516
Received 1,782 Likes on 884 Posts
Default

True pitch on Bravo 1 props is about 1" than the stamped pitch. Still a little high at 17%, but not extreme for a heavy older straight V bottom boat.
Griff is offline  
Old 07-21-2011, 03:47 PM
  #3  
Registered
Thread Starter
 
Join Date: Oct 2008
Location: Toms River, NJ
Posts: 617
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Griff
True pitch on Bravo 1 props is about 1" than the stamped pitch. Still a little high at 17%, but not extreme for a heavy older straight V bottom boat.
So then what are you saying the true pitch is a 29 or 27? I do have a bravo one 26P iam going to try tomorrow since my WOT rpm's are still low (should be about 5800rpm's). Will see what I come up with that. What about the X-dem? Should I try a drive spacer?
Erik
crapr6 is offline  
Old 07-21-2011, 11:55 PM
  #4  
Registered
 
Join Date: Apr 2009
Location: Denmark and hopefully some place nice
Posts: 1,852
Likes: 0
Received 1 Like on 1 Post
Default

The true pitch is 27ish. As Griff said, not alarming but still high. Good prop work would be a great thing in your case. If done right, some of the slip could be used to add speed and efficiency.
A.O. Razor is offline  

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 On
Pingbacks are On
Refbacks are On


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.