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-   -   Cat hull vs V Hull (https://www.offshoreonly.com/forums/general-q/351642-cat-hull-vs-v-hull.html)

SecondWind 01-08-2018 08:04 AM

4 Attachment(s)
I'm no baller but have owned a single engine V and cat (tunnel hull probably more accurate description) both similar lengths (2000 Checkmate 259 Convincor & 2004 American Offshore 2600 NSX). My experience however is that X-dimension and propelller design/pitch size influence planing performance more than hull design. The American Offshore has an X-dimension that is higher than the bottom of the boat by approximately 1/2 inch. The Checkmate's X-dimension was significantly deeper than the bottom of the boat. The American Offshore also is running a 34 pitch B1 prop while the Checkmate was running a 26 B1 prop. The Checkmate would plane well with a full load of gear and people. The American Offshore needs some weight distributed towards the bow with a full load of corn fed passengers. Here are a few pics to highlight the difference in propeller depth of the two boats.

14 apache 01-08-2018 10:24 AM


Originally Posted by Single cat (Post 4603479)
From my perspective the engine combinationd and engine setups on bigger V bottom boats is alot different then in a cat hull. Is the big reason because they run so much deeper in the water and are a lot heavier and harder to plane ?

That's a pretty loaded question with no rite answer. We have similar engines going to come down to the set up more than anything. I would love to see how my power ran in a 36 skater. My power pushed my apache to 110.7 with no dialing in with propellers.

Single cat 01-08-2018 10:38 AM

I'm mainly just referring to how much load is on the engine.

turbo2256b 01-08-2018 12:33 PM

My only concern about tunnel hulls was easier to flip. Would rather get caught in ruff water in V hull. Cat hull more efficient Vhull less efficient.
Except my 23.5' seebold. Prop calcs for it were more exact using tunnel hull calcs for slippage that is

GPM 01-08-2018 03:07 PM

Stock set up for drive height, same motor, Bravo 1 drive, same Bravo prop, 22 Donzi Classic went 82 mph Gps , 22 Daytona went 104 mph Gps.

jeff32 01-08-2018 04:34 PM

that speaks for itself! but RPM were sure different with same prop at 82 and 104 mph!! revs up to 10 000 rpm ? or a lot smaller drive gear ratio ?

GPM 01-08-2018 04:43 PM

It was a long time ago, I'm sure there was a RPM difference, all stock the prop was deeper in the water on the Donzi. The V- hull just didn't run like the cat.


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