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#29
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New Glider Dream Elon Musk Flow
On Thu, 15 Feb 2018 13:38:45 -0800, ND wrote:
On Thursday, February 15, 2018 at 3:18:37 PM UTC-5, Kiwi User wrote: On Thu, 15 Feb 2018 05:36:39 -0800, ND wrote: On Wednesday, February 14, 2018 at 6:19:48 PM UTC-5, WB wrote: On Wednesday, February 14, 2018 at 2:01:41 PM UTC-6, Kiwi User wrote: On Wed, 14 Feb 2018 11:06:11 -0800, ND wrote: speaking of cars... this is a little nuts, but, airbags? i've always thought that during a crash, you probably smack the **** out of your head. Airbags shouldn't be necessary provided that your straps are tight and the anchor points don't pop off the hull, though your chin may hit your chest quite hard. The stick is be short enough that your head won't hit it and the shoulder + lap straps will stop your head hitting the panel -- Martin | martin at Gregorie | gregorie dot org That's assuming a straight ahead impact. A friend was killed when his glider impacted in a yawed orientating (spin). The side of his head hit the canopy rail hard enough to kill him. It would have taken side airbags to have protected him, or a helmet. side airbags is basically what i was thinking, to protect your head during a yawing or side impact. like if you were going into a ridge, caught a wingtip first, and impacted sideways. I'd have thought that the tip would catch, causing the glider to pivot round it through almost 90 degrees, putting the fuselage into the ridge nose-first. Have I got that wrong? -- Martin | martin at Gregorie | gregorie dot org yeah, it's not going to pivot on the wingtip and hit nose first. it IS going to pivot. but would probably pivot, stall, and begin to fall all while travelling sideways. the nose may be the first to touch the ground but i think the major force of the impact would be in a sideways direction, relative to the pilot. i think you'll agree that it wouldn't be a horrible thing to have airbags deploy around the pilots head in this situation (i realize its not him catching a wingtip) : https://www.youtube.com/watch?v=4nsXL72S9OA I don't think you can tell a lot from that: it looks more like low speed stall-spin onto the top of a wide spur. I can just about read the ASI, which looks to be reading in the low 30s and the yaw string also appears to show low speed judging by the way it first flaps about, followed by a slip toward the low wing as the spin develops. In the ridge-running scenario we were talking about the glider should be flying a lot faster to keep the glider responsive. I don't go near the hill at less than 55kts in my Libelle. Catching a tip would whip the glider round pretty fast and, if the slope is covered in scrubby stuff the tip isn't going to pull free. Of course, if your tip touches smooth rock, then things are rather different but thats a situation I've never flown in. My ridge running experience, apart from one flight in a DG-1000 at Omarama, has been under 3000 ft along grass or heather-covered ridges. In the conditions I think I understand airbags might help, but then again, they might not. Further, consider that a glider cockpit is a very small volume to trigger and explosive inflation in, so that could be very harmful by itself. Think of eardrums getting ruptured. -- Martin | martin at Gregorie | gregorie dot org |
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