VH-GMB

Hi Guy's,

I can't seem to find "wedge" shaped wood for the chines on my woody (International woody) so this is what I found, but not sure which way to put it on.
Here's a couple of pics, any opinions?

martno1fan

you will need to go with pic 2 then when its fastened on use a small plane to plane it back so its flush with the sides of the boat!! plane to within a whisker then sand it back .you could just sand it if you prefer i hope this helps and welcome to the wonderfull world of woodys.hers a pic of my chines!!.

VH-GMB

Hey martno1fan,

I was kind of leaning that way my self, but I thought it best to ask you guy's first. Thanks for you help.
I'm going to put the build thread on here soon, It's the same as Bentley and Steve's.

Thanks again, Regards VH-GMB

martno1fan

noo dont do it like theres do it like mine !!
http://www.rcuniverse.com/forum/m_5452887/tm.htm

VH-GMB

The hull is mostly built, (just like your's) I'll post some pics later.

Flabum

If you know any one with a table saw, you can cut that wood so the the bottom of the chine is level with the horizon.

VH-GMB

Hi Flabum,

I know just such a person, It should be done hopefully today

Glen

martno1fan

It doesnt matter what angle they are at as long as they come to a sharpe edge and are level with the sides.Glen will you be adding strakes to the hull bottom it will add speed to the boat as they help create a bit of air under the boat and stop drag.get your mate to cut them when he does the chines!!.

Paul M

Showing my inexperience here, but what is the function of chines?

dwr9

It's not really a chine, it's a spray rail. The boat has a chine even if it doesn't have a spray rail. The chine is just the line where the bottom meets the side. The spray rail directs the water out and away from the boat so it doesn't get inside the boat as easily. It may also have some effect on the way the boat turns and may provide a little bit of lift depending on the design and the way the boat is set up. Doug

MrMikeG

Spray rails can be halfway up the side as well.
Chine rails hold the boat more upright in the corners.
Chine rails should be level with the horizon, not pointing down like in the picture. Pointing down they will hold the boat too flat in a fast corner and cause it to tip the wrong way, it will also act as a side keel when jumping waves causing the boat to flip.

VH-GMB

MrMikeG, Flabum,

What do you mean when you say level with the horizon?

martno1fan, Yes, I am planning on using strakes, but being my very first build, I don't expect too much form performance!

martno1fan

mike so your trying to say my chines are wrong? absolute rubbish ive seen enough real boats with chines of all shapes .the spray rail is normally on the side or where the deck joins as i did on my build.my chines will work just fine as they did on my last build and i had no issues with flipping or turning either for that matter.

MrMikeG

They should be flat so they are parallel with the water surface.

Martino, just because they work on your boat doesn't make it the right way to do it. Full size boats need reverse chines to help with lift, model boats do not. As for spray rails, they are used to direct the water spray away from the boat because water spray climbing the sides of the hull slows the boat down. So if your spray rails are up high the water is still slowing you down, if they are low you will have a faster hull. It is all relevant to if you want a fast boat or scale appearance.

VH-GMB

Thanks MrMikeG,
Got it!!

martno1fan

Mike the plans for this boat dont have any spray rails just the chines which i guess act like spray rails a little .i added the ones on mine high as some guys felt it might help keep the boat dryer inside which im sure it will.I dont think the angle on my chines is too bad as i used filler to make it a little more concave rather than a sharp angle.If there are any problems i can allways use some more filler to make them level with the horizon but i dont think i will need to.Sorry if i took what you said as a dig at my boat i get a bit tempremental sometimes lol.

Flabum

As I and mike said, the chine rails should be flat with the horizon, here are a few exampes of chines and spray rails:

Also, the strakes shoule be flat with the horizon as well.

patriktegelberg

May I be so bold as to ask why they should be flat with the horizon? Or flush with the sides?

Flabum

patriktegelberg

Ooh, I should have read that before asking. Sorry

Piranha Surface Drives

FLABUM, Yours is rite. Anything under the hull must be perpendicular to the vertical center line of the hull.
Changing the angle can cause wanted or unwanted outcomes. I have seen hulls with a negative angle in the chine, But it will cause over steering or bite in a turn. Which in a real boat can easly make you lose control in a turn, or throw people out of the boat...When the boat bounces in a turn and bites in.
Lifting strakes must be flat too. Many hours are spent sanding these straight and flat on real race boats to lessen the drag of the hull.
The only time ive seen negative angles in the hull, were in ride pads. The center ride padwould look like a flatened out " W". This would give a compression lift to the ride pad, forcing the hull higher than with a flat pad.

40 yrs with real boats. Ive seen alot of hulls......

w3bby

From [link=http://www.ocke.se/]Ocke Mannerfelt Design[/link] designer of the V24 one design powerboat (fullsize).

Speed Rail TM

Speed Rail is another product invented by us. It is a 3 foot long aluminium profil that fits the running strakes of the boat (of any boat actually).

Whereas normal spray rails deflects water horizontally away from the boat, creating friction and drag, the Speed Rail deflects water downward to further enchance lift, speed and fuel economy.



It also helps stability in both tracking and turning. The device is used on many European offshore raceboats.

Speed Rail have won two awards, in Sweden the "Golden Wheel" and in USA "Best accessories" at IMTEC, Chicago boatshow.

Speed Rail is patented.

glennb2006

Hi Ian,

Do you reckon this can be copied onto models withour infringing the patent they have and getting sued?

If it keeps going at this rate, our boats will not be in the water at all. Anyone fancy a deep vee hydro?

G

patriktegelberg

Ooh, people saying different things, I'd like to believe that all of you know what they are talking about, but I don’t.

glennb2006

Go on then Patriktegelberg,

it would appear that you have an opinion on this subject.

I have little doubt it is based on science. I will be interested to read it.

I am nearly at the point of having worked out the theory behind the rudder torque required - to the point I almost understand your calculations - almost.

I think on this particular subject there is a lot of "Seat of the pants" experience, on what works, and what does not, out there on this forum.


Glenn