12ft hull vs 13-6

A general, non-powerplant specific, discussion on airboat technology, ie., hulls, rigging, polymer, etc..
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Hog Guts
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12ft hull vs 13-6

Post by Hog Guts » Thu Dec 04, 2014 11:20 pm

Other than the obvious foot and a half, what changes with the feel / handling of the boat?

How much heavier? Does increased surface area help or hinder on the hill?

My existing hull is 12ft. It's 7-4 across the top and 6-8 on the bottom rear transom flat area. Looking at another hull but would be 13-6 and few inches wider top but not bottom (would have rounder corners my existing is 90deg from side to bottom.

Looks like either hull will have 540 260hp

Thanks


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dodobird
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Re: 12ft hull vs 13-6

Post by dodobird » Thu Dec 04, 2014 11:29 pm

i myself think wider n longer but not to long is better on the ground its like takin a piece of plywood and standin it on end and try to push it then lay it down flat and push it ull push it on the wider side easier :florida: distributes weight better JIMO
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scottyroll
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Re: 12ft hull vs 13-6

Post by scottyroll » Fri Dec 05, 2014 7:32 am

Hog Guts wrote:Does increased surface area help or hinder on the hill?
More surface area = more drag.
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sidejobs
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Re: 12ft hull vs 13-6

Post by sidejobs » Fri Dec 05, 2014 8:44 am

Less surface area = more pressure psi
It's all about the set up. I like a 13 better than a 12 but it depends on your entire set up/engine combo. I believe you will like the 13 6 a lot more for what you're gonna do.
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Andrew McD
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Re: 12ft hull vs 13-6

Post by Andrew McD » Fri Dec 05, 2014 8:52 am

Something to consider is push point of the prop. Two diff length hulls with same height of push point will perform significantly different. Yes, the shorter hull may have less surface area to drag and less weight, but it may be putting a lot of that forward thrust into the front ball of the boat thus causing a pushover effect and wasting thrust from the prop.... A longer bottom may allow more forward thrust to continue forward rather than being wasted burying the front of the hull down.

A little scientific video below:

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scottyroll
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Re: 12ft hull vs 13-6

Post by scottyroll » Fri Dec 05, 2014 9:18 am

sidejobs and andrewmcd have excellent points.With that power you should probably roll with the longer hull. Another thing to consider is the variety in hull dimensions, especially fiberglass, they all have different degrees of tapering meaning that the 2 same length hulls wont necessarily have the same amount of surface area on the ground. some are flat and some are more rounded.
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Hog Guts
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Re: 12ft hull vs 13-6

Post by Hog Guts » Mon Jan 12, 2015 6:48 pm

Well I ended up with the opposite of my original intent, funny how that works. Have an 11-6 should be on the water by this weekend I'll know what it will do once I play with it but I'm fairly sure it isn't going to sit there when I mash the gas :)


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Re: 12ft hull vs 13-6

Post by dusty burch » Mon Jan 12, 2015 11:45 pm

14 by 8 jimmy white is what I would recommend. ... best ride boat aaround

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Re: 12ft hull vs 13-6

Post by Packman » Tue Jan 13, 2015 5:54 am

Hog Guts wrote:Well I ended up with the opposite of my original intent, funny how that works. Have an 11-6 should be on the water by this weekend I'll know what it will do once I play with it but I'm fairly sure it isn't going to sit there when I mash the gas :)


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Bruce
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Re: 12ft hull vs 13-6

Post by Bruce » Tue Jan 13, 2015 8:37 am

Hog Guts wrote:Other than the obvious foot and a half, what changes with the feel / handling of the boat?

How much heavier? Does increased surface area help or hinder on the hill?

My existing hull is 12ft. It's 7-4 across the top and 6-8 on the bottom rear transom flat area. Looking at another hull but would be 13-6 and few inches wider top but not bottom (would have rounder corners my existing is 90deg from side to bottom.

Looks like either hull will have 540 260hp

Thanks


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Are you wanting to get rid of your old set up hull riggin?
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Hog Guts
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Re: 12ft hull vs 13-6

Post by Hog Guts » Tue Jan 13, 2015 6:46 pm

Already did this past weekend. Out with the old in with the new - good day. Rigging came back from Excell Coatings at port Canaveral today they did a beautiful jobImage


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kwanjangnihm
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Re: 12ft hull vs 13-6

Post by kwanjangnihm » Tue Jan 13, 2015 7:41 pm

lets see more photos of your build HG!! :thumbleft:
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Hog Guts
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Re: 12ft hull vs 13-6

Post by Hog Guts » Tue Jan 13, 2015 9:21 pm

I'll drop some on a new thread


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