Notices
General Boating Discussion

Gear ratio 1:5:1 vs 1:36

Thread Tools
 
Old 05-30-2014 | 01:41 PM
  #21  
Quinlan's Avatar
VIP Member
20 Year Member
VIP Member
 
Joined: Jul 2003
Posts: 4,288
Likes: 779
From: Tulsa, GLOC
Default

Originally Posted by GL@PBC
We have a customer with worked over 575s in a T/S who tried 34s, the boat would barely get on plane. We limped back to the dock and put the 32s back on!! Might be time for some 5 blades???
That does make sense- I could barely get on plane with the 32's on the 1.36s

Time to call B Blades
Quinlan is offline  
Reply
Old 05-30-2014 | 05:41 PM
  #22  
Smitty's Avatar
VIP Member
25 Year Member
Super Moderators
 
Joined: Apr 2001
Posts: 4,213
Likes: 0
From: Chicago il
Default

From my personal experience with bigger HP motors, the 1.36 was faster midrange to top end over a 1.50. 28 pitch on the 1.36 and 30 pitch with the 1.50. overall faster acceleration and 2 mph faster with the 1.36. Switching back to the 1.36 later this summer.
__________________
Want your ECU tuned right?? Call Mark at Precision www.pmefi.com
Smitty is offline  
Reply
Old 05-30-2014 | 09:58 PM
  #23  
Registered
 
Joined: Apr 2004
Posts: 1,268
Likes: 239
From: Michigan
Default

I believe that depending on each individual set up and overall desired performance it will vary as to what gear ratio will work best. Variables include single/twin, drive height, weight, step/straight bottom, prop type, and rake/cup, last but most important is HP/Torque. Problem is it gets real expensive real fast to "experiment" With all that rambling said my experience over the last 45 years of boating is that a properly "Tweeked" propeller for your gear ratio will make up for a host of other handling issues!

Wow! Sorry Guys, I think I just confused myself!
abones is offline  
Reply
Old 05-31-2014 | 09:26 AM
  #24  
Registered
15 Year Member
 
Joined: Jan 2008
Posts: 2,357
Likes: 2
From: San Diego
Default

Originally Posted by Smitty
From my personal experience with bigger HP motors, the 1.36 was faster midrange to top end over a 1.50. 28 pitch on the 1.36 and 30 pitch with the 1.50. overall faster acceleration and 2 mph faster with the 1.36. Switching back to the 1.36 later this summer.
To edit my post I have to agree that more mid range with a smaller prop is more likely. But the low end and planing belongs to a bigger prop. Mid range and top end smaller prop
mcprodesign is offline  
Reply
Old 05-31-2014 | 01:29 PM
  #25  
Thread Starter
Registered
 
Joined: Jul 2012
Posts: 61
Likes: 0
Default

The boat comes on plane Super easy with the 1:36 and 30 pitch, and the cruising speed RPMs are very respectable!
Unlimited39 is offline  
Reply
Old 05-31-2014 | 03:15 PM
  #26  
the deep's Avatar
Fast Singles Club
Veteran: National Guard
10 Year Member
Gold Member
 
Joined: Oct 2011
Posts: 4,042
Likes: 491
From: Raystown Lake , Pa.
Default

1:36 gear 26 labbed B1 prop pulls hard out of the hole and straight to top end like its azz is on fire . Strong cruise and great fuel economy to go along with this but of course not much drag with a cat .
the deep is offline  
Reply
Old 05-31-2014 | 07:09 PM
  #27  
Griff's Avatar
Charter Member # 55
25 Year Member
Charter Member
Super Moderators
 
Joined: Oct 2000
Posts: 20,273
Likes: 2,514
From: Omaha/LOTO
Default

Originally Posted by Unlimited39
Dr.pete, the boat was running 1:5:1 with 4 blade bravo 1 -32s with stock 575s, the motors were rebuilt- and Dynoed at 683hp @5600, they re geared the drives to 1:36 and spinning the same wheels but 30 pitch- boat GPSs at 96 mph- twin step, so it's set up right I believe, I was just concerned with longevity and dependability of the 1:36 gear ratio?
They were probably going through the drives anyway and swapped to the 1.36's so they didn't have to go to 34 or 36 pitched Bravo's.
No issues with longevity with 1.36's.

I run 1.36 regular Bravos on my AT and tehy have alot of hours with no issues.

Originally Posted by GL@PBC
We have a customer with worked over 575s in a T/S who tried 34s, the boat would barely get on plane. We limped back to the dock and put the 32s back on!! Might be time for some 5 blades???
The Bravo 1 34's have a different geometry than other Bravo props and act quite differently from the lower pitched Bravo props and are even different from 36 Bravo's.
BBlades has posted about the specific differences in the prop section before.
Griff is offline  
Reply
Old 06-01-2014 | 06:02 AM
  #28  
Thread Starter
Registered
 
Joined: Jul 2012
Posts: 61
Likes: 0
Default

Great info! Thanks Griff!
Unlimited39 is offline  
Reply
Old 06-01-2014 | 06:10 AM
  #29  
Thread Starter
Registered
 
Joined: Jul 2012
Posts: 61
Likes: 0
Default

Originally Posted by GL@PBC
We have a customer with worked over 575s in a T/S who tried 34s, the boat would barely get on plane. We limped back to the dock and put the 32s back on!! Might be time for some 5 blades???
I have seen on a couple occasions on Richie Zuls Motors, He seems to like the 4 Blade Hydromotives on his set ups-with the top gun TSs, as far as what gear Ratio he is running??? not sure- But i know there not as easy to find?
Unlimited39 is offline  
Reply
Old 06-01-2014 | 01:53 PM
  #30  
TYPHOON's Avatar
Registered
25 Year Member
 
Joined: Feb 2001
Posts: 5,140
Likes: 236
From: Edison NJ USA
Default

Originally Posted by abones
I believe that depending on each individual set up and overall desired performance it will vary as to what gear ratio will work best. Variables include single/twin, drive height, weight, step/straight bottom, prop type, and rake/cup, last but most important is HP/Torque. Problem is it gets real expensive real fast to "experiment" With all that rambling said my experience over the last 45 years of boating is that a properly "Tweeked" propeller for your gear ratio will make up for a host of other handling issues!

Wow! Sorry Guys, I think I just confused myself!
I totally agree with you. The other BIG problem when you think you are comparing the 2 different set ups is the inconsistency's of the props you are experimenting with. Just cause its stamped a 32 pitch or a 30 pitch doesn't mean that's the base line. Bone stock new props are not all the same. So are you really doing back to back test? Most props have 1-2 MPH in them with some tweaking IMO
TYPHOON is offline  
Reply


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.