I Apologize in Advance

[MooseX]

how bout mudflaps for the chines?..little itty bitty ones

[JreisRZR]

never thought of a chine causing much turbulence in a surf wave, im sure purely cosmetic. i wonder if the x-25 has chines because the boat makes a pretty "corduroy" wake, mush more so than the rzr


beside, isnt fresh corduroy a good thing in the early morning!
(sorry minds on ski season)

[MooseX]

nah corduroy is cool but I prefer glass for that velvety smoooooth ride

[ragboy]

I don't think its just cosmetic, my guess is the boat would lean over with less weight also. They are designed to provide lift. Think of it like the convex V hull. No hook in back of the hull, boat sinks down making taps what it is. Without the Chine, the boat may weight easier, since it doesn't have to combat the lift from any chines. That is my reasoning for trying it. The rub rail effects the wave more than just cosmetic, the chine is more just cosmetic, but not if it is also producing lift at 12mph. I really don't know if it is or not.

[JreisRZR]

only one way to find out!

cut em off

its amazing that that tiny lip can make much difference in a wave.
somehting ive noticed behind our RZR is that right were the chine is the boat creates a very large HOLE in the water roughly 8 inches deep and 12 inches long. i did not ever notice behind our old malibu when surfing nor do i on my friends x-25 which we put more than 2500# in on one side to surf

[ragboy]

is your rub rail in the water? I have never seen a chine make a hole like that. Only the deck, or rub rail. You have pics?

[JreisRZR]

is your rub rail in the water? I have never seen a chine make a hole like that. Only the deck, or rub rail. You have pics?

nope i have about 4 inches from the rubrail when i noticed it and the platform creates minimal drag, i think i have pics of the wave itself, but not the hole. i cant tell for sure if it was off the chine but definitely right behind it, not running extreme weight either just 1300lbs plus people. this hole comes directly off the back of the transom, which is not somehting i have noticed on other boats

[ragboy]

I found a picture of the RZ2, and can compare to the Z3.

[Ewok]

I don't think its just cosmetic, my guess is the boat would lean over with less weight also. They are designed to provide lift. Think of it like the convex V hull. No hook in back of the hull, boat sinks down making taps what it is. Without the Chine, the boat may weight easier, since it doesn't have to combat the lift from any chines. That is my reasoning for trying it. The rub rail effects the wave more than just cosmetic, the chine is more just cosmetic, but not if it is also producing lift at 12mph. I really don't know if it is or not.

Your on the right track here, but you can't cut them out, that's probably one of the strongest parts of the hull. If you have a good fiberglass guy he might be able to fill it in for experiment sake but you would want it to be removable. The chines and lifting strakes are there to provide lift fort the semi-v hulls on the tiges. If you smooth out or fill in the big chines on the edges of the boat it will probably take more HP to get out of the hole and up on plane. Just like the convex hull, the v shape of the hull wants to push down into the water and it would really fight getting up on plane. If you want to learn more about the function of chines look up the difference between planning hulls and non-planning hulls.

[duffymahoney]

Man I want to cut mine out! Gosh not planning= a bigger fatter wave!! I wonder if you just took the chine back to about the same spot that the other one ends. So don't take it out completely just the last foot or so. A good fiberglass guy could make it just as strong or even stronger

[IDBoating]

Perhaps a hybrid: Remove only the rear foot or so of the chines. This would let most of the hull's length benefit from the lift the chines generate but would eliminate any water disturbance caused by the sharp corners at the transom.

BTW, those chines are not just "bumps" of increased thickness on the bottom of an otherwise smooth hull. They are molded in, visible from the inside surface of the hull too. If you cut them flush to the hull's surface, you'll have slots in your hull and seriously compromise its strength and integrity. I've done some pretty serious mods to my boat but this won't be one of them!

Also, Duffy, regarding your comment about your cut-down swim platform: That may be why I haven't seen any effect from these chines on the wave quality. I have the factory standard 2009 swim platform with the rounded corners so that may be hiding the effect. I should be going out again today and I will specifically look for it.

[Timmy!]

I think those are there for a reason and that is to provide lift while planing. As a comparison, my friend has an Epic 23v with the 496 and the OJ 14x14.25 prop on it and they weigh in the 3,300lb range. My RZ2 has the 340hp Marine Power and the stock 537 prop on it. We drag race the boats for fun every now and then and if we start at the same exact time, he can only take me for about the first 50' or so and then my boat just pulls away like it's no big deal even though he has 1,000 lbs less weight, more horsepower, more torque and a prop that should give him a ridiculous holeshot. The Tige hull planes faster and is more efficient and I think it's because of those "chines" as you guys are calling them. At some point I will swap to the Acme 1235 and then I don't think his boat will even get a holeshot on me.

[JreisRZR]

that makes alot of sense timmy i think youre onto somethin
hmm this is getting interesting.

FWIW even though it pertains more to wakeboarding the new star has like 5 chine type things on the back that go in steps, perhaps they are for wakeboarding

[IDBoating]

Also, Duffy, regarding your comment about your cut-down swim platform: That may be why I haven't seen any effect from these chines on the wave quality. I have the factory standard 2009 swim platform with the rounded corners so that may be hiding the effect. I should be going out again today and I will specifically look for it.

As promised I looked for any effect from the outermost hull chines on our wave. The chine does generates a string of bubbles but it doesn't reach the surface of the wave.

Here's a repost of a photo of our port wave:



Look at the bottom of the photo, just to the right of the wave lip. See that string of subsurface bubbles that is sort of parallel to the lip? That's coming off the chine. It passes under the swim platform and doesn't surface before it reaches the other side of the wave, so it doesn't have any impact on the waveface at all. It's also so close to the swim platform that I doubt most surfers would ever get the board anywhere close to it. Even if they did, there's so little air content that I don't think it would alter the board's behavior.

On our 24Ve at least, I don't think the chines are degrading the wave quality. I'm not sure if that's due to how our ballast system works, or because we have the larger unmodified factory swim platform, or ???

Hope this helps!

[duffymahoney]

Centurion, Malibu, MB's all waves look smoother. It's hard to really explain. I think the chines just cause disturbance. I can see the chine while I surf and I can totally see it causing disturbance in the face of the wave. Here is a picture of my Centurion avalanche wave for reference. It could just be cosmetic, but it could also like Ragboy is saying cause lift.