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-   -   Gear ratio 1:5:1 vs 1:36 (https://www.offshoreonly.com/forums/general-boating-discussion/313000-gear-ratio-1-5-1-vs-1-36-a.html)

Quinlan 05-30-2014 01:41 PM


Originally Posted by GL@PBC (Post 4130068)
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

Smitty 05-30-2014 05:41 PM

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.

abones 05-30-2014 09:58 PM

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!

mcprodesign 05-31-2014 09:26 AM


Originally Posted by Smitty (Post 4130262)
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

Unlimited39 05-31-2014 01:29 PM

The boat comes on plane Super easy with the 1:36 and 30 pitch, and the cruising speed RPMs are very respectable!

the deep 05-31-2014 03:15 PM

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 .

Griff 05-31-2014 07:09 PM


Originally Posted by Unlimited39 (Post 4129536)
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 (Post 4130068)
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.

Unlimited39 06-01-2014 06:02 AM

Great info! Thanks Griff!

Unlimited39 06-01-2014 06:10 AM


Originally Posted by GL@PBC (Post 4130068)
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?

TYPHOON 06-01-2014 01:53 PM


Originally Posted by abones (Post 4130363)
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


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