Weeeee 0 #1 May 9, 2006 Hi, anyone with a gps out there - If you are flying, and do a knee bend arms in, then throw arms and legs back out to a full chest high flare, what sort of descent rate and speed does the gps read for that second or 2 in deep flare ? Quote Share this post Link to post Share on other sites
The111 1 #2 May 9, 2006 Hmm, I wonder if we can get one more thread with "GPS" in the title? Ok, being serious... would GPS data necessarily be more accurate than barometric data in a dynamic situation like this? Guess it would depend on the sampling rate (and accuracy) of the device in question. I've never used any GPS device, but I'm pretty sure I've seen a spike of just below 20mph on a couple of my Neptune graphs (I have no idea what a Neptune samples at), and this probably was not the "best" possible, since I don't recall ever trying a max dive followed by a max flareout (I don't think my arms would like that). I do know that I've registered negative descent rates (climb) during high speed tailgate exit. And I have heard rumors of speed skydivers pulling out of 300mph dives into tracks and stalling out at about 40mph (without a wingsuit). If I had to guess I'd imagine it is possible, or damn near close to possible, to register a zero fallrate temporarily in a wingsuit, if you really want to.www.WingsuitPhotos.com Quote Share this post Link to post Share on other sites
Costyn 1 #3 May 9, 2006 Quote Hi, anyone with a gps out there - If you are flying, and do a knee bend arms in, then throw arms and legs back out to a full chest high flare, what sort of descent rate and speed does the gps read for that second or 2 in deep flare ? I'll try it out next time and let you know. But why a GPS? A protrack would show the vertical descent rate too, or do you want horizontal speed as well? In which case there are other factors invovled, like angle of your body during dive & flare and stuff like that.Costyn van Dongen - http://www.flylikebrick.com/ - World Wide Wingsuit News Quote Share this post Link to post Share on other sites
vidiot 0 #4 May 9, 2006 Quote would GPS data necessarily be more accurate than barometric data in a dynamic situation like this? At least GPS will not be disturbed by dynamic pressure which does strange things, e.g. when exiting from a tailgate aircraft or during freefall. Apart from the usual factors limiting GPS accuracy you have to consider that civilian GPS have a build in limitation for the change in acceleration ('jerk', typically 20m/s^3) to prevent you from using it to guide a missile or home-build fighter jet. This limitation is well visible during deployment, but probably not during freefall. KlausMy Logbook Quote Share this post Link to post Share on other sites
