rottger
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Pete, The OD VO 65 is a very nice boat and probably a little bit less on the edge as the VO70 Box Rule boats. It is a move to an OD boat trying to get more teams involved. It is now easier to step in late and there no risk that your design is of the pace, so less risk for the corporate sponsors. I loved however the design contest that was always an important part of the Race and that is now gone. You get a VO 65 OD and thats it. Bruce Farr's track record in the last races was not very impressive and so it is a big surprise that his team was asked to design the OD boat. But a cool boat it is! The high-end racers like the IMOCA en VO boats are getting so fast that the yachts are the limiting factor, you can't go full throttle all the way. You have to know when you can go full power and when you have to nurse your ship. Compare it with car races: If you think you can keep your foot down all the way you will learn an important lesson in the first corner. This was not so obvious too all VO competitors, see the massive amount of structural failures in the last races. If there is a weak link in this VO 65 the sailors will find it and then you have 8 boats (7 competitors and 1 spare) with a problem in stead of 1. Hans
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Michael, I don't think that we disagree, I was talking about the full size practice! A new form is making an interesting and successful comeback: The whole rectangle with only the frond edges a little bit rounded. Like a barge or a tjalk. Most class rules does not allow this shape but in the mini 650 it is allowed and nearly unbeatable. These yachts are not pleasing to the eye, but Righting Moment to the max makes them fast. Look for pictures of Magnum 747. Harvey, solo / shorthanded ocean racers have all jibs on a separate foiler hosted ready to use. The sails are so big that changing them would take to much time and energy from the sailor. Hans
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Harvey, The roller used for the jib is a differend one as used for a genaker. You would nead a very big drum to hold the amound of line needed for a gennaker, a furler with a endless line is used. Unless something goes wrong, you would never take down a sail before the next sail is up, it would cost to much speed! Pete, your Volvo looks great! Hans
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Pete, These boats are so wet, that complete waves are rolling over the deck, cabin and cockpit, knocking sailers down, only kept on board by their lifeline. Imagine to be on the foredeck in the Southern Ocean, freezing temperatures, and be hid by a massive wave, containing tons of water, coming at you with 30+ knots! As these modern racers are going faster and faster the aerodynamic aspects of the design are crucial. Freeboard as low as possible, rounded deck-hul joint, winches lowered in the deck or behind the cabin, reduced standing rigging, cabins as low as possible etc etc. Keep building! Hans
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Nice work Pete! Although I still have to get used to seeing a older Imoca 60 style cabin on a modern Volvo style hull, it definitely looks nice and fast. Hans
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Harvey, Funny that of all the mini pictures available you showed this one! 713 is the old boat of 2 very good friends. Later (in 2011) they where the first married couple to sail the Mini Transat Race (each solo in their own boat!), a very special achievement. I hope to make a model of my own mini 595 but I have some full scale projects for that boat in progress! Pete, the mini is a lot of fun if you can handle it. Upwind they are fast for a 6.5m yacht, but reaching and running is where the fun starts. They have up to 135 m2 sail area running for a 700-800 kg boat! I like your Volvo model, good progress! Hans
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Harvey, On light displacement boats (with a wide a...) you want them to heel to minimize wetted surface. I don't think that a chine is a sudden increase in RM (righting moment) but you want the boat to have the chine on the surface. The water will flow of the chine with enough speed. Increasing heeling angles does work wonders with long overhangs as you wrote, but these modern boats are vertical ended so not much change there. Waterline length on a planning boat does not help, but as you are also not plaining, a longer boat will usually be better. Simplified you explained the design process, but i think that the tooling is now evolved and more specialized, as are the architects. I am not a architect either, but I sailed a lot on modern racers and now sail a proto Mini Transat 650 solo. These Transat boats could be seen as mini V70's with canting keel, asym. daggerboarts, waterballast, twin rudders etc,but then sailed solo! Hans
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Harvey, These boats are all about creating maximum stability. This quest for stability gives you more hull area (and resistance when upright). They have however so much sail area that this is only a real handicap in light and upwind situations. The rest of the time they use their brute power to plane to the horizon! To understand the chine, you think of a boat much wider as is practical or allowed by the rules. You get a flatter more powerful shape. then you chop off the parts of the hull that are not allowed. You end up with a shape that acts as if it was a wider boat. As these boats are optimized for ocean racing they do not sail upwind with fine angles often, they sail a bit lower under the assumption the the wind will change anyhow in the next day(s). The topspeed of these boats can reach almost 40 knots with an average of 24 knots! Hans
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Pete, The Brunel is a new one design Volvo 65 used for the 2014-2015 Race. This is the first time The Volvo race uses an One-Design boat. The Brunel rig is not identical to a Volvo 70 rig! It is up to you if you want to build a imaginary Volvo boat, or you would like to have some more scale approach, these boats are all very "cool" and a fusion model will be cool also . Some additional information regarding the Daggerboards: The keel is canted to windward from the center of the boat apr. 40-45 degrees. If the boat is canted an other 15 degrees to leeward, the dagger keel is 55-60 degrees of the vertical. the projected area is therefor minimal en so the keel is constructed with the minimal resistance en only used to hold the big led bulb to windward. If you want to see this on youtube look for the Hugo Boss keel walk. This is a Imoca 60 and canted extreme for the promotion video, but the video makes it very clear. Hans
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Pete, If you want to build the winning boat of the 2011-2012 Volvo race you are going to build the wrong one! The French Groupama 4 was the winner . The boat you are showing in post #9 is Hugo Boss not a Volvo 70 but a Imoca 60, these are designed for shorthanded ocean races like the Vendee Globe and Barcelona Race. @Keith, These boats have daggerboarts because they use a canting keel with the ballast attached to it. The keel is only used for maximizing (optimizing) the stability of the boat and has almost no function as creator of lateral lift for upwind purposes. The 2 asymmetric daggerboarts are used for that purpose. These Volvo 70 are amazing boats and I look forward to follow your build! Hans
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