... That isn't so obvious to me if there is more than one foil, like the banana foils. A flying hydrofoil will pretty much always sail heated up - there's...
I'm fiddling around trying to improve the downwind, light airs, performance of the Neptune Servo pendulum self-steering windvane, on my Sadler 32. The thing is...
Tom, thanks again for your very well though out response. More comments / questions: ... My concern about the upper part of the foil is generating lift to...
... symetrical ... are ... the ... heated up ... Tom, when I wrote that I had in mind a configuration where the foils are fairly equally immersed, say if you...
John, When a rear Tee foil breaks the surface the result is quite spectacular as the bow digs in and the boat either pitch poles or goes into submarine mode...
Hi The wheels are not backward-rotating on these ones, and they seem to aquaplane ok. Also they seem to keep away from deep water. Can't think why. Giles...
This post is in response to Slade Penoyre's recent article in Catalyst 27, entitled, "A Proposed Offshore Wind Power System Using Small Floating Generators."...
I once looked into a floating 'free land' which consisted of lots of large steel units joined together by electrical generator damped hinges. In quantity you...
I never understood that small case/capital case thing. deca- hecta- and kilo-watts must be small case, while mega- giga- and tera-watts must be capital case....
As a civil/structural engineer who has been involved in immersed tunnel design, where segments are cast ashore in a cofferdam basin, then floated out into...
... tunnel design, where segments are cast ashore in a cofferdam basin, then floated out into position and then sunk and connected together (like mulberry...
... I remember meeting Andrew Henderson, who was doing an analysis as his doctorate study: "Analysis tools for large floating offshore wind farms." (University...
... Fascinating :) I just got my copy too and I was very tempted to pen an email ... ... Thanks for these links. They look very interesting. My own comments...
Dave Howorth
dave@...
Aug 14, 2007 8:30 pm
718
Ahoy Gentlemen, When I was a young lad about 10 or 11 I learned first hand about shallow water effects. My dad had built me a 14 foot flat bottomed skiff, and...
I agree with Charles, that 100 meter hulls is more like it. Depending on the weight of the hulls, that hull length and distance apart would dictate the height...
In a mixed bag reply : filling the channel with turbines. I've heard that 12km*12km array would cover the UK's requirements. We have an electricity feed from...
... no-no-no !! it wouldn't produce enough power to produce the material and energy you would need to replace the sails every few weeks. "Sails" are not...
... Tedlar coatings, by Dupont, are available in film thicknesses from .5 to 5.0 mil and will serve this purpose. Inflatable buildings with service lifetimes...
... about a ... nicely. Nice observation. I was fascinated to find that the large high speed (30kt I think) sea- going ferries that operate from Rosyth on the...
Doug Thanks for your reply. These are definitely displacement monohull ships, quite unlike the even faster huge catamaran ferries that operate between Larne...
Giles, I get the feeling the ferry is surfing on it's own body wave. Not the bow waves or the stern waves but the wave generated by the whole length of the...
Giles, Doug This phenomenon of surfing your own bow wave was exploited in the 19th century by the canal swift boats. These boats are effectively run up to...
Thanks. I am aware of the dramatic effect where the boat and its waves are in a canal etc (constrained by side walls and a bottom, waves propagating in one...
It occurs to me that there should be at least two categories of sailing speed record, for shallow water where aquaplaning effects are significant, and for...
Doug You say that when your boat was going best, you found that its propellor had been in the mud. I wonder if that had contributed to the effect? In...
There is little doubt that cold dense wind is an advantage--modern record attempts are set in cold weather almost exclusively. Water which is too shallow has...
