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Old 04-20-2003, 07:15 PM   #1
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Default reverse chines

After i did a search on reverse chines, it would seem (from the reading) that they should be dang-near mandatory on all deep V hulls to help stabilize the hull at rest. And, it seems, they help reduce spray for a drier ride. i don't think that i read one negative thing about them. BUT, as always, there must be a catch. So, what are the downsides to reverse chines? And another thing, what other things can a deep V boat have to stabilize the ride, besides getting bigger and wider (i will resist the obvious joke here). Since the weather has been too crappy for me to work on my boat, i have obviously been thinking about them way too much.
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Old 04-20-2003, 07:56 PM   #2
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Default reverse chines

Anytime something catches water, deflects it or rocks into it, there is an impact. This can make the ride seem a bit harder than a smooth hull as those forces transfer through to you, but can make the best compromise for dryness or stability. The chines also promote easier planing, for a related reason, additional lift. If you just increased the V or deadrise to smooth out the ride, you negate some of the positive effects of the chines and increase the need for additional power. It is a tradeoff, and it seems a balance has been reached somewhere between 18 an 24 degrees at the transom, and some significant variances at the bow between 24 and 48 degrees or more.

Then there are the powercats, just when you started understanding those issues. WC vs. GB, planing vs. displacement, etc.
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Old 04-20-2003, 09:30 PM   #3
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Default reverse chines

around here of late to add sponsons aft at the chine for stability and additional aft bouyancy to cater to the heavier 4 stroke OB's.

This is done mostly with alloy boats because it's not that difficult to fold up a pair of alloy sponsons and weld them onto the sides of an existing hull.

They tend to operate like large spray rails - they do remove a little top end but help hole shot and stability at rest a lot.

Some like em, some don't - I've seen a few that actually looked pretty good. I've seen some that looked like dog shyte stuck to the sole of a boot.


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Old 04-21-2003, 02:14 AM   #4
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Default reverse chines

When I installed Bennett trim tabs on my boat, they tended to damp the rocking motion considerably. They act likt big paddles in the water and provide some roll resistance. The further outboard they are, the more effective the added roll damping is.

The big thing that helps deep vee hull stability is the center of gravity. Since I run an I/O, I've got about 650 lbs of iron deep in the bilge that helps with the rocking.

My old J.A. is not a deep vee hull by any means, but with the flybridge weight, anything that helps stability at rest helps me. I've got very sensitive inner ears and a blown knee. I'm actually a little more comfortable sitting in a plush helm chair, going slow and pounding over the chop in my boat than fishing on an equal size Contender when the day is done.

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Old 04-21-2003, 05:37 AM   #5
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Default reverse chines

Those 'reverse chines' come standard on Boston Whalers!

Boston Whaler, "MUMBLER", 24' Outrage, twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
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Old 04-21-2003, 09:50 AM   #6
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Default reverse chines

You won't notice anything bad about reverse chines unless you sleep on your boat alot. Just the slightest ripple on the water & it is slap, slap, slap, slap etc. etc. all night from the chine where it enters the water. Our Albin 32+2 is an incredibly dry boat thanks to the chines but the noise at rest can drive you nuts.
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