Mx next

Originally posted by pondmonkey it was a poor imitator then... we tested the 302 at our club around the time we were mincing around in 420s, they were awful little boats, windsurfer influenced toestraps, crappy little kite, foils that snapped when you capsized.   I remember the guy saying they were like 'Mx Rays' but for kids, jumping on the kite-bandwaggon no doubt... a poor comparison.

Just been watching the video of the 27 foot version on SA. Seems to make a bit more sense when blown up in scale... Still seems to be sailed on its ear, to get the canting keel clear of the water.

Ah fair enough. Didn't look back. Too busy keeping up with all the 100 owners post tennis!!!

Just watched the video and it seems quite funny to me that while loads of folks are trying to design boats to rise above the waves this boat is looking like its going to go through and under the waves!!!

Originally posted by tgruitt Originally posted by Daniel Holman I suspect that as long as it is made well, more towards the small diameter/thick wall and if 2 part the join is good, that the mast will be fine with kite up and bow burying. Surely having shrouds and a forestay would do a better job?

A different job. A properly engineered unstayed rig will have in the order of 3 x the thickness at the base of the mast when compared to an equivalent stayed mast. That means somewhere near 20 x the inertia, so whilst the deflection at the tip with respect to its undeflected position may be greater, the stress may very well be lower.

When you load up the stayed stick you put compression into it too, which is sometimes a problem with skinny walls.

People need to get their heads around the differences between the deflections of, and stresses experienced by, unstayed masts.

The burying of the bow gives rise to an acceleration, which is what magnifies the static forces. TBH the fine bow will bury more progressively and give rise to lesser load spikes I would have thought.
Going down the mine is probably not a lot differnet to big bearaways or running aground, all events which will have associated acclelrations and load/stress spikes.