Chine Location

I am wondering how to calculate the optimum vertical distance between the chine line and the water line. Do you know of any calculation sites or empirical formulas?

 

Motor boat or Sail boat

For 0.40-0.60 Froude
or
For > 0.80 Froude

Upwind or Downwind

Waves 1 meter High or 6 meter High

Mediterranean or Atlantik

 

My boat is HSC. Froude is up 0.8. 40 knots. I think you misunderstood me. I am wondering about the height difference between the waterline and the chine in the middle of the ship. How many cm below the waterline should the chine of the ship be?

 

Answer is impossible . You should ask : how high above the water surface , chine in the middle of the ship should be ?

 

Welcome to the forums
So HSC = High Speed Catamaran
Read this paper.
https://www.cembercikutuphanesi.biz.tr/catamaran/design/SAOS_paper.pdf

 

Why do you think it's a catamaran ?

 

By HSC, I assume you mean high speed craft, i.e HSC 2000 code rules?

The location depends upon many many factors, however....in general....if the chine is coincident with the floating at rest waterline, at roughly midships, is a good start.
Thus the chine rises fwd and above the dwk to the bow, and below the dwl aft. But...it depends...

 

<shrug> Fn > 0.8; V > 40 knts, and a chine.... so a cat is a good guess in today's environment. The OP didn't say...

 

What I mean by HSC is a high speed craft. Since I use a water jet, I cound't keep my chin line very high. For example, in LCG it is 5 cm below the waterline. What do you think of this distance? I don't have any problems going up to planing. but I really want to position this chine line according to a certain calculation method.

 

What do you mean by LCG?

 

Like middle of my ship.

 

I think I don't understand you. For me, LCG is the longitudinal distance, from the origin of the coordinates, to the ship's CoG. That distance, then, is measured horizontally from the ordinate axis, not from the waterline.
On the other hand, I still don't understand it, because the CoG is usually always quite above the waterline.
Please excuse me if I am seriously misunderstanding what is obvious to everyone else.

 

It would be helpful to have the OP actually tell us the length, beam considerations and what the service is. The deadrise and beam pretty much fixes the chine "height" above the keel of the
hull. The length of the boat ,COG and the weight of the boat will determine the chine height at rest. (with respect to the water)

Adhoc, would you design the hull based on chine height?

To the OP, why do you think that chine height (I am assuming at rest) is an important design parameter?

 

Nope!

 

I am afraid that if my chine line is too far below my waterline I may not be able to get into the planing form and my velocity will not be as I want it to be. I am wondering how far below the waterline my chine line should be to get the best velocity and drag. Actually I know it is related to deadrise but I don't want to increase the deadrise too much. I want to know if this chin height will be enough for me or if I need to increase the deadrise.