I enjoy sailing and sailboat racing, but sailors depend on launches & support boats. I think those boats can be improved to consume less fuel,...
In my opinion Carl Scragg moved the ball forward in displacement hull design with the derivation of an optimum curve of areas from wake theory in...
What is the state of the art in semi-displacement hull design? Are there observations we can make across several types, from yacht club launches...
Does anyone know what came of Julien_C's work, posted at: Development of a reliable performance prediction tool for semi-planing hull forms...
Yet I see evidence advances are being made. While I'm having trouble bringing up the electronic edition, I see in the table of contents of the...
Are we agreed on the definition of lift? Here's my effort from post #15: I would think "lift" refers to the vertical component of the bottom...
I think Dave G 9N is correct on the facts, here, AdHoc. I want to give you the benefit of the doubt, though: can you say what point you're trying...
I agree with this.
Having slept on it, Jehardiman, I think I see your point, and that it is relevant to the heading & initial post. You're speaking of accelerating...
Jehardiman: I think you're conflating hull resistance and propulsive efficiency. Of course propulsive efficiency is a thing, nobody's denying...
It seems to me "hump speed" is exactly what we've been talking about. The resistance "hump" is very clear on the Nigel Irens graph I posted on...
While I agree with some of what Sharpii2 has has said, above, I understand the term "hull speed" as defining the upper limit of the displacement...
Velocity is the numerator in Froude Number. If L is the numerator, you've inverted the fraction. Fn = V (speed in m/s) / [g (9.81 m/s^2) x Length...
I see the image of the Stevens hull: [IMG] Would you call that a basic "warped bottom"? Do you know if any boats had more notable or...
Could you provide a formula for what you're calling slenderness ration, Jurgen, including units? If what you're referring to is displacement /...
Looks like the 8m from the Clara Boat Company is the more comparable boat to other 26 foot launches and the more recent design from Nigel Irens....
I'd be comfortable saying the Oldport represents the minimum and the Rangeboat represents the maximum. I'll get around to calculating those...
Because I don't believe a monodendron is the way to go here. I also believe advances have been made (in military craft, as we've discussed in the...
Group project proposed at Electric Launch Design optimized for semi-displacement speeds...
Several quick thoughts: The handicap winner of the Sydney-Hobart just sailed was a relatively narrow Reichel/Pugh design. Had the Reichel/Pugh...
