ronnie wrote:A girl I knew came close to drowning, when her windsurf harness line got twisted around the spreader bar hook and held her under the sail in the shorebreak. She bought a spreader bar with a release at both ends.
I have this Q/R on my windsurf harness for the same eventuality. Unfortunately, this one, made by Maui Magic only has it at one end of the spreader bar, but it is the best I have seen, and releases with a flick of a finger.
http://www.powerkiteshop.com/accessorie ... aderss.htm
If they had that on both ends of the bar, it would do the job.
ronnie,
It is good to have you back on the project!
I like the looks of that bar, but, to play the "devils advocate", I would voice the argument of the skeptic, concerning 2 things:
(1) That bar release was designed to function as a release for a situation where a Windsurfer is trapped under the sail...in which case, there would be a relatively small force being exerted on the bar, at the time the person is triggering the release. The situation during a kiteboarding incident, where the release would be triggered, would probably involve a dragging situation, where a lot more force, at the time of the release attempt, would be placed on the bar. The release mechanism may not function under this situation, because of the much higher force placed on the bar. The release also may jam if the bar is being twisted. Therefore, this type of release should be considered a "convenience" release, until proven by through testing, to be a reliable release, when stressed by a much higher force on the bar.
(2) A bar that needs two separate release triggers (one on each end of the bar) could be very dangerous, in that, it would be very difficult to press each of the two release triggers at exactly the same time, to release the whole bar. I could conceive of some severe problems in releasing the second trigger, after the first one was released. For instance, the bar would probably violently twist, and change position, making it impossible to either find or press the second trigger.
I think that one of the key requirements of a totally releasable bar system would be to have only ONE release trigger, which would engage a mechanism, resulting in the release of both ends of the bar at once.
I will post another prototype, suggesting one way this could be accomplished, after I take some pictures of the model's features, later today.