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Location: Natal - Brasil Turner Theory I do a Turner study for my new design but as is the first time that I do this I am a little confusing in take conclusions. If somebody has a table of offsets with a Turner's graphic already do and send me, I can test the program more quickly. Location: Netherlands Never heard of a Turner study, can you provide some background information? Location: Albuquerque NM USA PM me with your email and I will send you a copy of my CSYS paper on the method. Originally Posted by Grant Nelson Never heard of a Turner study, can you provide some background information? Interesting is also Welch's Line that are lines that represents the distances from the CoG of inclined immersed areas to center line, transversally (plan) and vertically (profile). The second image shows qualitative metacentric analysis for various classic yachts (from the times when Turner's theory was still being occasionaly applied) and the names of the yachts. In praticular, I think it should be no problem for you to find the offsets for probably the most famous yacht of all times - schooner America. I am sure that you are aware of the fact that, strictly speaking, Turner's method is valid for stationary or slowly moving yachts. Location: Italy (Garda Lake) and Croatia (Istria) By the way, Satanita was given as an example of a yacht with a badly shaped curve of metacentric moments, very unbalanced fore and aft. In fact, during one of regattas she went out of control, hit against Valkyrie and sank her.
Italian is not a big problem because Portuguese is the last flower of Laccio (?) (nidus of latins languages). Location: Natal - Brasil Thanks to Earl that sent to me his paper explaining very clearly Turner's theory. I understand that cutting heeled sections at each station from sheet material and balancing them on a knife edge we are determining the station heeled immersed CoG and gluing the sections together in a stack and balancing it we are determining the CB position and the metacenter. Being Welch's Line the positions of station CoG several afirm that if the Welch's line beeing right the boat has stability direction. However my exercices show me that I can have good Turner's Moment Curve and bad Welch's line and vice versa. I understand that if is valid for slow motion is valid for the boat in other conditions like in waves and in a limit velocity and in this case what we can do is study accordingly.
Originally Posted by fredschmidt I understand that if is valid for slow motion is valid for the boat in other conditions like in waves and in a limit velocity and in this case what we can do is study accordingly.


Summing it up, Turner's method wants to analyse a hull balance at high speeds by considering static-case waterlines and sections.
If we need calculate the immersed areas using the real station form in the wave, with the real dynamic waterline, why do not do this? If we have a approach that seems reasonably to explain a phenomenon why not extend the study of the case to go further? Originally Posted by fredschmidt If we need calculate the immersed areas using the real station form in the wave, with the real dynamic waterline, why do not do this? Maybe you could use a trochoidal waveform to approximate a wave around the hull, but it still remains a guesswork.
And then, there is another point: Turner's theory only considers the hullform in order to determine whether it will be balanced at speed or not.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
Location: Michigan Multi-Hull layouts evolution of theory and design What was the problem with this boeing hydrofoil hull? I need to get a general feel for the physics at work here, and the evolution of planning hull theory and design. Location: Port Orchard, Washington, USA 1) The Boeing jet foils and other, military, hydrofoils dissapeared because the strut mechanisum proved to be too fragile to handle floating object impact, and the prodigious fuel consumption. Originally Posted by jehardiman 2) Flat hydroplane hulls still exist, and they still have the problem of getting airborne. Location: Port Orchard, Washington, USA The hydrodynamics of hydroplanes is all about surface friction. Originally Posted by jehardiman Hydroplanes with large flat lifting surfaces actually need little ripples to attain maximum speed I wonder if anyone had experimented with textured surfaces. Look at some of the early Harmsworth Trophy boats (such as Maple Leaf IV)for the proper way to cause this effect with the hull. Claimed a 10% speed increase or 10% drag reduction BUT the material was impregnated with Mercury as antifoulant ,, much ungood .
Location: Queensland The pleats in the whale's throat are not there for speed, they are to allow it to expand to swallow huge amounts of water. Eric jehardiman 10-10-2006 12:49 PM 1) The Boeing jet foils and other, military, hydrofoils dissapeared because the strut mechanisum proved to be too fragile to handle floating object impact, and the prodigious fuel consumption.
Originally Posted by jehardiman Hydroplanes with large flat lifting surfaces actually need little ripples to attain maximum speed I wonder if anyone had experimented with textured surfaces.


To compensate the moment introduced by the oarsman that stay always in the same side, the gondola's frames are placed along the length in a curve, not in a straight line like the usuals boats. Now, I dont have the linesplans for all of those yachts, but I have included in the following images what I have. And I also think it shouldn't be a big problem for you to understand the description of Satanita in italian. Each of these moments represents the station contribution for the CB position and by the verification from boat plans with good and bad balance, hulls that have good balance have the Turner's Moments Curve in one way and bad balanced hulls have it in the other way.
As you can see (and as you know) a dynamic waterline at the midship section (Section A-A in the pic) is lower then a static one, because the midship section floats in the wave trough. That is the single biggest contradiction which has led the sailing community to abandon the method. It completely neglects the effect of sails, keel and rudder, which are equally (if not more) important.
Augustine, FL, USA As I recall, the Boeing Hydrofoil was very expensive to build and operate for its time.
Racing hydroplanes three-point (forward forks and tail) are supreme in the unlimited catagories, but have no clear advantage over the older 1950's to early 1970's style in the lower HP and speed ranges.
11-26-2006 09:56 PM The pleats in the whale's throat are not there for speed, they are to allow it to expand to swallow huge amounts of water. I also don't have offsets, but with some effort you can measure them form these linesplans. Yet, somehow it seems that the method did indeed give some very balanced yachts, like the said Zyklon. It is mis-referenced in Chevalier and Taglang's books as being from the SNAME (US) instead of INA (UK). So it is obvious that any stability analysis (Turner's included) done for a static waterline is not valid in this condition. Btw, it is easy to modify the drawing in order to obtain a heeled hull, drawing it upright is just a matter of commodity for me.



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