Foils Well, this beachcat is on foils so when off-the-wind, the hulls will be out of the water. I've found that this parasitic drag is about...
I have calculated the parasitic wind drag from the hulls and cross beams of a beach catamaran by equating it to a flat plate with a width equal to...
Thanks again Tim. I will have to start paying consultancy fees to you shortly.
The International Moth website has some theory on the lift and drag of foils http://www.intmoth.com/design/lift.php...
Fiddling Got it after a bit of fiddling. Thanks Dave
I'm looking for the profile coordinates of a 65010 in a similar format to that shown on the attached link for a NACA 63010....
Could this be expanded upon a bit (particularly the centre of gravity placement)? I have moved the two front foils (submerged, incidence...
A's on foils Is there anybody out there experimenting with foils on A Class Cats? Rohan was making noises about putting his A Class on Ilett...
Italian paper Thanks Tom. Does anybody know about.... 1. Marazzi, R., "In Barca Con L'Aerodinamica," Multiscafi, Milan, Italy, Aug. 1982.
If anybody knows how I can get hold of the following papers, I would appreciate it. 1. Marazzi, R., "In Barca Con L'Aerodinamica," Multiscafi,...
...... v Moth It would be interesting to put it up against a hyrdrofoil moth to see which would be quicker on a windward leeward course. My...
Yes, I agree about not modelling the sail. You will need the composite design add-on to Strand. It is quite expensive. Dave
Stress Analysis of Fibre-Reinforced Composite Materials by Michael W. Hyer is a reasonable text. It should be possible to model the sail on the...
I just happened to be reading about this last night in Marchaj's 'Aerohydrodynamic of sailing'. He said that it depends on the thickness of the...
Maybe Frank Bethwaite is warming to multihulls as he was out sailing a windrider Rave on the weekend ...or maybe he just thought that he wanted...
I agree with Dave C that the inclined rig will reduce the effective L/D of the boat and hence require a higher wind speed than an equivalent...
Frank's HSP boats From what I saw in Franks book, High Performance Sailing, they all had small sails, minimal beam and very inclined rigs. He...
It is only his opinion but Dave Hollom states in the latest Seahorse magazine that he sees "no advantage, other than manoeuvrability, in having a...
A trimaran may also be faster in drift (<5 knots) conditions as the boat is healed slightly allowing the sails to fall into a nicely aerodynamic...
Round-the-worlders It is however interesting that cats have held the round-the-world records for a long time. Dave
