Like Tree0Likes

19 to 21 pitch guys

Reply
Old 08-31-2009, 06:04 PM
  #1
Registered
Thread Starter
 
Join Date: Aug 2009
Location: North Las Vegas
My Boats: 87 Scarab Excel
Posts: 118
Default 19 to 21 pitch guys

OK I have a 87 223ls alpha put a 19 3 blade on it and am having 5000 rpms when trimmimg out.. How many think a 21 will be perfect ans still be at high 50s
BiLLyLaurianO is offline  
Reply With Quote
Old 08-31-2009, 06:47 PM
  #2
Registered
 
Join Date: Jul 2007
Location: San Diego
My Boats: Advantage 28ft Sport Cat w/ pair of 8's
Posts: 989
Default

It sounds like the 19 is where ya want to be. The 21 will lower your rpm's too much, and reduce the acceleration .


Darrell.
DMOORE is offline  
Reply With Quote
Old 08-31-2009, 07:17 PM
  #3
Registered
 
Join Date: Oct 2008
Location: Central New York
My Boats: 32 Fountain Fever
Posts: 334
Default

Saw your post on another site also. You said you have a 454/330 with an alpha, so that's means your RPM range should be 4200-4600 at WOT. I would run a 21p 3 blade, or at least try one. It should bring your RPM down to 4600 where you should be and probably add a couple mph. A boat I had last year had a 350/alpha and came with a 19p, my WOT was 4900 rpm so I tried a 21p Mirage Plus, my rpm was 4300, so I tried a 21p Stiletto and brought my rpm back up to 4500, about 100 rpm short of where I should have been. I ran it the rest of the year and loved how it handled and had great bite. Oh, it also added about 6 mph over the 19p. Actually I still have the prop if you're interested, 14.25x21p Stiletto stainless with solid hub, I sold the boat with the 19p.

Last edited by 89Mach1; 08-31-2009 at 09:04 PM.
89Mach1 is offline  
Reply With Quote
Old 08-31-2009, 10:30 PM
  #4
Registered
Thread Starter
 
Join Date: Aug 2009
Location: North Las Vegas
My Boats: 87 Scarab Excel
Posts: 118
Default

got the 21 Solas 14.5 dia. I will test this weekend and see what it does. Local prop guy said 21 should put me right were I want to be
BiLLyLaurianO is offline  
Reply With Quote
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



All times are GMT -5. The time now is 06:04 PM.


Copyright 2011 OffShoreOnly. All rights reserved.