Go Back  Offshoreonly.com > Technical > General Q & A
Crownline 225 CCR 454 MAG is slow!!! >

Crownline 225 CCR 454 MAG is slow!!!

Notices

Crownline 225 CCR 454 MAG is slow!!!

Thread Tools
 
Old 09-28-2020 | 05:42 PM
  #61  
Registered
15 Year Member
 
Joined: Nov 2009
Posts: 4,198
Likes: 500
From: KY
Default

Originally Posted by bajaman
There are all sorts of "boat speed calculators" out there that take into account prop pitch, outdrive ratio, rpm, slip, etc. At some point it is all a math model. Figuring 10% slip and a 1.50:1 outdrive ratio, here's the speeds @ 5000 rpm according to one of them:
  • 21" prop = 59.7
  • 22" = 62.5
  • 23" = 65.3
  • 24"= 68.2
  • 25" = 71.0
  • 26" = 73.9
Marine Propeller Calculator
Slip never, ever stays at 10% or any other number
AllDodge is offline  
Reply
Old 09-28-2020 | 07:05 PM
  #62  
Registered
 
Joined: Aug 2018
Posts: 85
Likes: 39
From: Chicago IL area.
Default

My buddy said he can run 10' chop, . lol. 8900 rpm, 98.98746463 gps mph.
SR24Dave is offline  
Reply
Old 10-01-2020 | 12:14 PM
  #63  
Thread Starter
Registered
 
Joined: Dec 2017
Posts: 219
Likes: 6
Default

Originally Posted by bajaman
There are all sorts of "boat speed calculators" out there that take into account prop pitch, outdrive ratio, rpm, slip, etc. At some point it is all a math model. Figuring 10% slip and a 1.50:1 outdrive ratio, here's the speeds @ 5000 rpm according to one of them:
  • 21" prop = 59.7
  • 22" = 62.5
  • 23" = 65.3
  • 24"= 68.2
  • 25" = 71.0
  • 26" = 73.9
Marine Propeller Calculator

These are the same numbers i got but I also read these hulls have strakes that slow the boat and makes it hard to get pas 64 mph without heavy mods. This is the wrong tim eof year to just be getting the engine in the boat. Too dang cold to get it out and run it. Waiting for a decent weekend.
cableguy1979 is offline  
Reply
Old 10-02-2020 | 06:49 AM
  #64  
resurrected's Avatar
Platinum Member
20 Year Member
Platinum Member
 
Joined: Jan 2005
Posts: 1,157
Likes: 520
From: Owen Sound Ont.
Default

I don't believe strakes will slow you down, hook and weight will for sure. Strakes help lift the boat out of the water, downside is they are a flat surface which can make for rough impact with the water on re-entry.
I had REV4's on my 233, the hole shot was amazing.
resurrected is offline  
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 On
Pingbacks are On
Refbacks are On



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

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.