Hull shape question

ronward

Petty Officer 1st Class
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Jun 24, 2013
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I'm looking at two different boats with different hull shapes and would like some opinions on how each would act. Both are deep v's. One still has a pretty good v to it at the stern. The other transitions from the deep v to almost flat across the stern. The v starts almost identical on both boats, both boats are within a few inches of each other at 17'. Both are old Starcraft 'glassers. The hulls are almost identical except for the very pronounced difference in the sterns. Power will be an 85 Johnson outboard. Engine height would be adjusted to either boat so that vent plate is at or slightly above bottom of transom. Everything else being almost equal, how will the difference in the hulls affect ride, handling, performance? ANY thoughts would be appreciated.
 

Thalasso

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Jan 18, 2011
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Re: Hull shape question

The sharper (v) at the stern signifies more dead rise. The more dead rise the better it handles and rides in rougher water. If your setting still fishing the boat will have more of a tendency to rock back and forth more so then one with less dead rise.
Rather then me try to explain it i found this.Maybe this will explain it better.

Deep V, Shallow V, or Variable Deadrise Hull Performance ...
www.tropicalboating.com/.../deep-v-shallow-v-or-variable-deadrise-hull


All Aboard Boats: What's the Deal With Deadrise? | Boating ...
All Aboard Boats: What's the Deal With Deadrise? | Boating Magazine
 
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ronward

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Re: Hull shape question

Thanks guys. I've read the articles and here is what I get. Let me know if I didn't get it at all. With everything else being almost the same, the hull with the flatter stern (less deadrise) may be slightly faster or better on fuel given that there is less boat in the water on plane but may give a rougher ride and probably tend to slide a little in tighter turns. The other boat with more deadrise would be more stable in rougher water but may sacrifice some stability at slow or no speed. Did I get it right?
 

Maclin

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May 27, 2007
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Re: Hull shape question

Yes, in general. Some V hulls with a sharp deadrise at stern have a distinct flat pad on the bottom that can increase top speed in calmer conditions.
 
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ronward

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Re: Hull shape question

Would it be safe to assume that no faster than an 85hp is gonna push a 17' glass boat that there would not be a huge difference between the two hulls? I would prefer the slightly more stable fishing platform but the "real boss" would prefer the more stable ride at speed. Buuuuuuuut...What she doesn't know won't hurt her right?
 

Maclin

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Re: Hull shape question

Can you give more details on the models involved, year, model, etc. Also pics help. Sounds like they are designed for different purposes but hard to just guess.
 

ronward

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Re: Hull shape question

I will do that. I can't do it til later this evening. One boat is mine, the other is on craigslist. I'll try to figure out how to get pics of both on here. Thanks for the help
 

Thalasso

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Re: Hull shape question

Where and what type of water conditions do expect to be in? I wouldn't think you would want a deep v in a 17ft boat. Rough water will beat you up in a 17ftr. If used mainly for weekends and just putting around or setting still and fishing the flatter bottom is better.it will be more stable setting still. Those big dead rises are mainly for big water boating where the water gets rougher.
I can't see you going out in the Atlantic. (Topsail Beach) (Wrights-ville)
 
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MikDee

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Re: Hull shape question

Deeper Vee's tend to rock a lot, if you're running in rougher waters like offshore, you can't beat them though. I'd default to the shallower vee myself.
 

ronward

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Re: Hull shape question

Where and what type of water conditions do expect to be in? I wouldn't think you would want a deep v in a 17ft boat. Rough water will beat you up in a 17ftr. If used mainly for weekends and just putting around or setting still and fishing the flatter bottom is better.it will be more stable setting still. Those big dead rises are mainly for big water boating where the water gets rougher.
I can't see you going out in the Atlantic. (Topsail Beach) (Wrights-ville)
No no. Strictly intercoastal waterway and rivers
 

ronward

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Re: Hull shape question

I think I've decided on the shallower v. Now I gotta convince my wife we need another boat. Thanks everyone
 
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