Zep 0 #26 November 13, 2004 The original thread was asking "What causes GR" I've had some good answers, Thanks Davedlg did a very nice graphic I did wonder if Mr Kallend would come in with his Physics, That stuff amazes me, regretfully I never took physics at school. For me typically GR is when the ground just stops doing nothing and gives the illusion of coming up at you at a hell of a rate I think I'll hook up my old PD170 (F111) an see if it still gives me the same rush, maybe as you get older your perspectives change. an belive me I'm an old fart Gone fishing Quote Share this post Link to post Share on other sites
pchapman 279 #27 November 16, 2004 One variation on ground rush (or, more broadly, visual perception issues in freefall) is when objects are not the size a particular jumper is used to seeing. Let's say someone usually jumps where there are a lot of small farm fields, surrounding a small airfield. They travel to another DZ with bigger fields or a much longer runway. At the same altitude, everything they are used to seeing is bigger, taking up a wider angle in their vision. For example, I've anecdotally heard of a jumper from England, with smaller farm fields, visiting a bigger US drop zone for the first time. They pull when they suddenly notice everything below getting really big -- better safe than sorry -- and then realize they aren't even close to going low. Quote Share this post Link to post Share on other sites
chuteless 1 #28 November 16, 2004 As for what causes GR....I always looked at it as a willingness to NOT believe your altimeter, and believing that the ground is much closer than it is. On several jumps I have had ground rush at 18000 to 20,000 feet after a good freefall, and that is why I carried both a sensitive and a non-sensitive altimeter. I believed the instruments although my mind told me I was closer to the deck, and I still had quite a ways to go. Bill Cole D-41 Quote Share this post Link to post Share on other sites
Airman1270 0 #29 November 16, 2004 ...The ground fills your entire field of vision (there's no horizon) and is spreading out _fast_. It's pretty good arround 1000 feet at terminal, a few hundred feet sub-terminal... _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ March, '88 - My first cutaway, around 2000'-ish, flipped over and tried to pull the reserve, but it wouldn't come out. Tried a few times and finally got it with two hands. Got open at 400', about three seconds before impact. The ground got real big, real fast. As the pilot chute launched, I just watched. Imagine being on the ground & watching someone in freefall at 500'. That's how fast the ground is coming up. Wow. Cheers, Jon Quote Share this post Link to post Share on other sites
jumpinjackflash 0 #30 November 16, 2004 My pulse just increased reading it. Pucker factor 10+ at least. Damn. It's a gas, gas, gas... Quote Share this post Link to post Share on other sites
Levin 0 #31 November 17, 2004 i got a little bit of groundrush on my last jump. though maybe not the same groundrush yall are talking about. It was my 2nd CRW jump. I have a Spectre120 and CF uses a Sabre170. In a downplane that makes me slightly inverted. I was seeing the ground coming up under the nose of my canopy. My plan was to not in anyway scream like a girl. At the last split second he got me and I yelled BREAK! He let me go at 80' and I swooped out of it. It was sweeet!!. CRW rocks. I think I might like it better than freeflying. And better yet I can do them both on the same jump. I primarily jump an FX74. So when no CRW dogs are on the jump then the FX is always fun too. But I've never gotten anykind of groundrush swooping it. I guess because I always look at the ground at an angle instead of directly at it. Quote Share this post Link to post Share on other sites
packerboy 3 #32 November 17, 2004 Not really the same as the real deal, but if you want to get an idea of groundrush, look for lowpull.mov on www.skydivingmovies.com. Not sure about doing direct clicky... -------------------------------------------------- In matters of style, swim with the current; in matters of principle, stand like a rock. ~ Thomas Jefferson Quote Share this post Link to post Share on other sites
Levin 0 #33 November 17, 2004 seen it a bazillion times. and everytime i see it again i have to see it atleast 3-6 times. Quote Share this post Link to post Share on other sites
bob.dino 1 #34 November 17, 2004 A link like this is perfectly fine. Linking to directly to the .mov would make pilotdave angry. Quote Share this post Link to post Share on other sites
packerboy 3 #35 November 17, 2004 So linking to the page that has the download link is ok... allrighty. Will do next time. I think I have seen almost every movie on that site, and that is definately one of my faves!!! Wild shit! I think if you know someone who doesn't appreciate how much altitude you can lose with a bunch of turns on a small canopy. You should direct them to that! -------------------------------------------------- In matters of style, swim with the current; in matters of principle, stand like a rock. ~ Thomas Jefferson Quote Share this post Link to post Share on other sites
georgechurchill 0 #36 November 18, 2004 I personally haven't experianced ground rush until I am below 300ft. The most amazing ground rush I have had was when I free falled a 215ft electric pylon. I was looking at the ground. My impact point was total un-moving where everything in my perioperal vision was swallowing me up....really nice feeling.....I have never had that over 300ft Georgehttp://georgechurchill.blogspot.com Quote Share this post Link to post Share on other sites
