But someone told me that this does not work, you can not scale a hull that way it will not work, that in order to scale down the boat would sail in a much more dense than water.
DO NOT believe what you have been told - IT IS WRONG - if you do a very careful study in 'google' or other search-engine - into 'A' class model sailing yachts - you will find that - way back in the beginning - these very fine model yachts were a direct development of a - 6 mtr racing yacht. Location: Cocoa Beach, Florida Dias, you might want to contact Fred Schmidt who is a member here and heavily involved in IOM racing in Brazil. Location: SF bay I've never understood how tank and windtunnel testing could be of much value if things didn't scale.
Originally Posted by Squidly-Diddly I've never understood how tank and windtunnel testing could be of much value if things didn't scale. Things do scale-and quite nicely BUT-Dias seemed to be talking about scaling down a much larger boat to one meter. 1& 2 above illustrate that a VOR70 could not realistically be scaled down to one meter. Location: Albuquerque NM USA Well, you can't fool Mother Nature, but you can fool the human eye. You have opened a can of worms with this thread on this forum that will go on for many pages in arguement and confusion. Location: Chile Do you know the Magnun 747 mini transat designed by David Raison? When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.

Location: Cocoa Beach, Florida Radio Controlled Foiling America's Cup Catamaran Since the rules were just so dramatically changed for the full size boats AND since two of us have already built boats(as AC 55's from the previous thread) I wanted to come up with basic Rules that would be as close to the new rules as possible while allowing the two completed boats to be immediately legal. As far as I'm concerned that is the Basic set of rules until more boats are built and an excellent foiling system or systems are developed and proven. My primary direction now will be to complete and foil my boat with three different foiling systems as well as experiment with the Trapeze Power Ballast System.
The D4Z below is one of the first two AC4.8RC cats and is nearly complete and will be under constant development. Help with solar powered boat » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post 35th Americas Cup: Foiling Multihulls!
Warranty: Thunder Tiger guarantees this kit to free from defects in material and workmanship at the date of purchase. This site requires JavaScript to function properly.Please enable JavaScript in your web browser. The International One Metre rules requires me to build a boat of 4 kilograms and use a very accurate rig, so with these variables I can not play. I wanted to maintain the look of those great gaff rigs so I kept the sail plan very close to scale. Jim in Australia's prototype is under development but is sailing and has foiled for short bursts.
So what generally happens if you try to do exactly scale is that the model has too little displacement and too much sail area.

I did an exact scale Melges 24 at a length calculated to work for a model-it was 55" LOA(see below) and had an asymetric spinnaker. That worked well allowing the two completed boats to closely fit while maintaining the proportions of the full size boats. I just want to know if the lines of a hull designed for a length of real yacht can be reduced to just one metre will work. Hull is self-stick mahogany veneer laid over a fiberglass shell with another layer of fiberglass on top. Draft is increased as is thickness of the keel to give more displacement and a better ballast ratio.
Next iteration will have more displacement forward and less aft to reduce the tendency to pitch down on the beat.
Goes like a bat on the reach or run, but like her big sisters she's a handful on those points of sail.

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