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