The sail is pushed by a plane wave of intensity I and frequency ω. The sail is modeled as a perfect mirror of surface density σ = ρ ℓ with ρ the mass density and ℓ the thickness. the use of collective effects to accelerate large amounts of particles to high energies. The fundamental point of Veksler’s proposal was that the radiation force on the cluster scaled as N 2, providing an example of his new principle of coherent acceleration, i.e. In 1957, V. I. Veksler suggested that Thomson scattering by a small cluster containing N electrons may accelerate the cluster to high velocities. Great boat, great club, great group of people.The scattering of an EM wave by a particle also leads to momentum absorption and acceleration. Repeated shoulder surgery and issues turned my Laser into a beach toy but the shoulders are getting stronger and I might get back so am curious how the sails do. just the old ones got blown out and were slow). I never thought I was at an advantage or disadvantage regardless of the sail selection (generic, class legal, or who made them. I found the generic sails (I used them too) are usually a little different but with tweaks they can be made to work. The other thing I will say 2 years down the road was that the sail held up great. Was asked to put a thread up about it and did so you might find more with a search. This is a bit ago so I might not be recalling it correctly. I needed slight tweaks to my vang, outhaul, and cunningham settings but that is normal even when swapping out a new for an old sail of the same type. After 2-3 sails frostbiting it seemed to "break-in" and the issue never reappeared. Should not have to do that (the spars were in good shape) but it is what it is. It also helped a bit if you pushed the bottom of the sail up the mast after taking cunningham off going downwind. It could be removed by adding vang back but it made for a hard stiff leech and slow downwind speed compared to what I was used to especially in light air. It appeared in downwind mode when you want the vang off more and and a softer leech for by the lee sailing. I did observe that same vertical creases about a foot or so behind the mast, about 4 feet long but up higher and not extending to the bottom. The Mark II class sail was fine upwind and reaching with no distortion similar to what you mention so long as the normal level of vang was on to induce some mast bend when the sheet was eased. But somewhat similar and somewhat different story easily resolved. I can only talk to the Mark II class legal sail - not the Intensity, sorry. I do not have a Class MK II sail yet to compare it to.ġ) Is this just how the new MK II sail is cut and we have to find what settings are best in the 0-8kts upwind range?Ģ) Or is the Intensity sail still a work in progress and they have some tweaking to do to match the class sail? They did a great job matching the MK I version and with a better sail cloth. Several others at my club have noted the same thing. Downwind the sail looks great in all wind conditions with the Cunningham blown off and Vang set to a downwind setting. At around 8-10kts it feels great once I can crank on more Cunningham and Vang. And this is racing against other boats with a mix of MK I class legal sails and knock off sails of both the MK I and MK II variety. To me it feels like the sail is way under powered like this but if I let the Cunningham off it looks TERRIBLE and feels equally as slow. I have the Intensity MK II Laser Sail and the sail takes a lot of Cunningham just to get the wrinkle from the mast joint to the clew to a reasonable level.
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