Notices

3 blade vs. 4 blade GPH

Old 04-25-2007, 01:17 PM
  #1  
Registered
Thread Starter
 
Join Date: Aug 2006
Posts: 1,348
Likes: 0
Received 1 Like on 1 Post
Default 3 blade vs. 4 blade GPH

3 blade vs. 4 blade GPH-

What is the difference? I know 4 blades have a better cruise but what are we really talking- 5%, 10%, 25%?

I am running twin 300XS's 5800RPM, 3MPG, 44GPH, 65MPH (was still in break in..) with 24 Bravo I 4 blades.

I want a "day-to-day" prop (26 Bravo I?) and then a "fast" poker run prop (25 Mirage Plus labbed?) but if there is not much cruise difference I would go with a non-labbed day to day prop (25 Mirage +?) and then a labbed poker run prop (same 25 Mirage + labbed or labbed Tempest or ___?)
marylandmark is offline  
Old 04-25-2007, 02:37 PM
  #2  
Gold Member
Gold Member
iTrader: (1)
 
ziemer's Avatar
 
Join Date: Apr 2006
Location: St. Cloud, FL
Posts: 1,479
Received 4 Likes on 3 Posts
Default

This is more of an extreme condition, but I'll give you my real world example.

On my Allison, I run a 28" 3-blade for top end, but I wanted something that would carry a load a little bit better since I usually have my family with me and I'm rarely in the boat by myself.

Anyway, I bought a 24" OT-X 4-blade from Hydromotive for this purpose and at around 5000 rpms, I was cruising at just shy of 60 mph, which wourked out to about 4-5% slip. My 3-blade 28" runs about 2-3 mph faster at the same RPM, but comes in around 10-12% slip. If my 3-blade prop was a 24" based on my results I would cruise at least 3 mph slower with the 3-blade at the same RPM.

Of course this is with my boat and these 2 particular props, but you can get the idea of how your fuel efficiency may go up or down depending on the prop you're running.

Your efficiency depends on a number of things and the only real way to know what the differences will be is to try different combinations.
ziemer is offline  
Old 04-25-2007, 03:49 PM
  #3  
Registered
 
Join Date: May 2002
Location: Tampabay Florida
Posts: 1,014
Likes: 0
Received 0 Likes on 0 Posts
Default

I run a 25" Hydromotive Quad 4 by Throttle Up on a 29Renegade. This worked better than the Bravo 4 & Mirage in general. The CC consoles need their tails lifted & the Quad 4 lifted the stern, allowing us to get better overall results. Matt & Julie actually cut the blade down a little as we were getting too much lift. Call Throttle Up & try a Quad 4
Johno is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
fandango
Wanted
6
05-15-2008 08:14 PM
bonecrusher
General Boating Discussion
12
03-09-2007 10:12 AM
LFarr
Prop Talk
11
08-25-2005 08:09 AM
wtpowered
Prop Talk
7
07-04-2005 03:34 AM
Intolerant1
General Boating Discussion
20
04-08-2002 09:08 AM

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


Quick Reply: 3 blade vs. 4 blade GPH


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.