Extension box & X-dimension question 28 Daytona?
#1
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Extension box & X-dimension question 28 Daytona?
I have a 28 Eliminator Daytona TD. After trying to measure properly it appears both propshafts are about 1" above the lowest point of the outside sponsons.
Would extension boxes improve performance on this particular set up? Or, what would be the ideal set up on this particular boat for maximum performance? Is 1" above the bottom a pretty high x-dimension? Any suggestions would be welcomed...
Would extension boxes improve performance on this particular set up? Or, what would be the ideal set up on this particular boat for maximum performance? Is 1" above the bottom a pretty high x-dimension? Any suggestions would be welcomed...
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Re: Extension box & X-dimension question 28 Daytona?
Cats generally can run very high X dimensions. The bow is carried by the cats lift. On my last couple, I was running SSMs about 3/4" above the bottom (directly in front of the drive).
I've only seen a comparison with, w/o Boxes on a couple Chris Cats, and they didn't gain much speed. Not sure about your application.
I've only seen a comparison with, w/o Boxes on a couple Chris Cats, and they didn't gain much speed. Not sure about your application.
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Re: Extension box & X-dimension question 28 Daytona?
On older 28' TD with boxes and Bravo 1s, about 1" up from the bottom, measured right in front of the drives is all you want. Any higher than that will be tough to get on plane. At 1" up and 36" props, it is real tough to get on plane without using the tab. It easier to get on plane with smaller props.
You need to measure from right in front of the drive.
You need to measure from right in front of the drive.
#5
Re: Extension box & X-dimension question 28 Daytona?
1" above the bottom is what Eliminator recommends on 28 TD, I called them and spoke to their head rigger last spring. If you put a box on remember it will lower X abot 1" so you'll have to make that up with shorty drive... What I like about boxes is its free length to the boat (improves ride quality), planing is much easier, and the water is cleaner heading to the props which can reduce slip.
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Re: Extension box & X-dimension question 28 Daytona?
The extension box will help dramatically with planing. It will also help slightly when in rough water. I had a box on my 26' cat and could plane easily with the prop 2" above the pod. The boat also planed with true cleaver, although it did spin up before grabbing. When the boat was loaded with a handfull of people, the box actually caused the prop to hook too well and it bogged the engine. This could be a bad thing if you use too much throttle. You'll end up twisting off a prop shaft or vertical shaft.
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Re: Extension box & X-dimension question 28 Daytona?
Originally Posted by Cord
The extension box will help dramatically with planing. It will also help slightly when in rough water. I had a box on my 26' cat and could plane easily with the prop 2" above the pod. The boat also planed with true cleaver, although it did spin up before grabbing. When the boat was loaded with a handfull of people, the box actually caused the prop to hook too well and it bogged the engine. This could be a bad thing if you use too much throttle. You'll end up twisting off a prop shaft or vertical shaft.
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Re: Extension box & X-dimension question 28 Daytona?
Eliminator has been fooling around with the 28 and by raising the drives up 1 or 2 inches the boat gains 5-10mph top end. The downside of course is the added difficulty getting the boat on plane. Powerboat just tested a 28 with 525's and the boat ran 120.4 but the drives were mounted higher than normal. In 2001 they tested a 28LP (open bow) with Teague 620's and it only ran 114.5. Raising the drives on a 28 works but you sacrifice planing ability.
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Re: Extension box & X-dimension question 28 Daytona?
Originally Posted by pstorti
Eliminator has been fooling around with the 28 and by raising the drives up 1 or 2 inches the boat gains 5-10mph top end. The downside of course is the added difficulty getting the boat on plane. Powerboat just tested a 28 with 525's and the boat ran 120.4 but the drives were mounted higher than normal. In 2001 they tested a 28LP (open bow) with Teague 620's and it only ran 114.5. Raising the drives on a 28 works but you sacrifice planing ability.
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Re: Extension box & X-dimension question 28 Daytona?
I think boxes make it easier to get on plane but I don't think they give you any speed, at least not on a 28 Daytona. Did you end up getting P5X's?
If you go up an inch on the drives you should be about 5 mph faster.
If you go up an inch on the drives you should be about 5 mph faster.