Hi Dennis. Waves made by a boat are indistinguishable at a distance from waves caused by other mechanisms. They are all gravity waves at the interface of air...
... Very much so. Interesting developments are the axe bow in moderate sized freighters and at the other end, the latest small catamaran designs. I studied...
Hi All, Am busy with a house extension project, and Te Wheke (see Wikiproa) is up on the hard. However I have been doodling and came up with a leeward scow...
________________________________ "Sailplane pilots and sailors are often the same person".......From the perspective of means and ability this is all too...
I am re-learning to use my GPS each time I do something like this, so I do not have the max speed readily available. I know that I saw 8.4 knots on the GPS at...
I think there are several areas where aero experience can be applied to boats. How often do you hear people moaning about weather helm or rounding up when it...
... To the contrary, Chris, I actually agree with you. Hobie cats, with asym hulls markedly similar to asym proas, have similar issues with the CLR traveling a...
Ok, I'll bite. My vision for this sort of thing: Imagine a catamaran with 12' hulls and about 5'-6' of beam - narrow and small for real sailing performance...
Hi Laurent, ... Sounds pretty decent given wind conditions, windward sailing and you reefed to be conservative. The fact you passed the entire fleet on the...
Or... 3. An interceptor trim tab at each end, just before where the hull starts to curve up. It's like a shallow daggerboard (1-3cm??) all the way ACROSS the...
Hi Paul, I reckon option 2 sounds much better. You could simply run a 2x1 (say) on edge across the outside of the hull at the hinge point and do a Wharram rope...
... My personal opinion now that I have sailed on a catamaran this size is ... There is a cat designer named Richard Woods who has done a pretty good job of...
Holy cow - that's a new one on me! It seems like this makes a wedge of stalled water in front of the 'tab' which then does the same as a normal solid trim tab!...
... Interceptors are becomming the preferred means of adjusting trim for high speed ferries, as they are smaller and less complex than trim tabs. Also, they...
Janusz Please take care to capture each boat from bow to bow in movie camera mode - a 2 minute clip per boat is enough for the group to get a sense of each...
My "problem" is that I took standard Prindle aluminum rudder heads; they are pretty tall, so the distance between both support is significant. The top mount is...
I am sure it works; and yes, it is counter intuitive. But at what speed? I cannot believe that our small sailboats can go fast enough to take full advantage of...
I think there is less drag because they have less surface area than flaps. Gurney flaps are exactly the same things but used on airfoils, as far as I can tell....
... Yeah seems to be sort of an aquatic Gurney flap! There is a bit of info / analysis on Gurney flaps out there (which came from race cars first!). A quick...
... Yep I can see making an upper rudder mount well above deck would interfere with things - not to mention probably looking ugly! Might be done if designed in...
For an excellent quick review http://en.wikipedia.org/wiki/Gurney_flap ____________________________________________________________ Refinance Now 4.0% FIXED! ...
Congrats! I really ised hanging out with you, Laurent, Skip et. al this year, but a new baby conspired to keep me in the house. I really think that skip's boat...
Its oh so easy to get sucked into the ways of the new past. Crab claw rocks !!!! most sail area set low in an uncomplicated way and an uncomplicted sail does...
Thanks for your input. It sounds like that might help. However, I just don't have the time to build a new ama, so I will just have to make do with what I have....
Funny that I have a study plan of Romany I got many years ago and completely forgot about it - got to look in one of the closets inthe house - thanks for...
Here are some measurements: Main hull (Aka): hard chine, symmetric (I read a report once of a fellow who built an assymmetric hull, and found his proa was...
"The French multi-mania includes proas (a particularly virulent strain) and designer Denis Kergomard appears to be particularly stricken" Laurent is not...
