virulindex 0 #1 February 19, 2008 What is burble? Thanks! Quote Share this post Link to post Share on other sites
NWFlyer 2 #2 February 19, 2008 The pocket of air created above a jumper's body when he or she is in freefall."There is only one basic human right, the right to do as you damn well please. And with it comes the only basic human duty, the duty to take the consequences." -P.J. O'Rourke Quote Share this post Link to post Share on other sites
Andy_Copland 0 #3 February 19, 2008 A sure excuse to grab some arse.1338 People aint made of nothin' but water and shit. Until morale improves, the beatings will continue. Quote Share this post Link to post Share on other sites
virulindex 0 #4 February 19, 2008 What type of effect does this pocket of air have on a jumper? I've not felt it in my four jumps. Quote Share this post Link to post Share on other sites
dragon2 0 #5 February 19, 2008 You wouldn't have felt it, unless you were flying directly above another jumper or were flying very close behind and slightly up from another canopy. Take a look at a boat going fast in the water, you can see the trail it makes, think about that in the air when you can't see. The burble is the reverse of the direction of flight/fall, so for most freefallers the burble is directly above a jumper so that's a very good reason to make damn sure you're never there; there's "no air" there, you'd fall straight down onto the lower jumper. With a canopy, if you pass closely behind and above another canopy you can feel the bump, if this happens low (ie you get taken over by a smaller faster canopy on final) this may scare you a bit as it feels turbulent and can drop you a few feet. The burble is one reason why formation skydive camerapeople have big wings, to prevent them falling into the team. Also if you go low under a formation you can drop one or more jumpers on top of you if you fly directly beneath them. With canopy relative work the cameraflyer can fly his canopy into the burble of the team and the canopy will more or less stop flying and just bump around a bit in the burble, making it easier to stay in place to film. With wingsuiters, because they fly as much horizontal as vertical, the burble is also to the back and up, so you can fly straight above a wingsuiter and not drop down on them. ciel bleu, Saskia Quote Share this post Link to post Share on other sites
dragon2 0 #6 February 19, 2008 Check out this video at 0:30 the jumper in white up top has approached the formation too low and he ends up below the jumper in black on the right, see what happens to the jumper in black? ciel bleu, Saskia Quote Share this post Link to post Share on other sites
Jeff.Donohue 0 #7 February 19, 2008 You've not felt it in your four jumps because no one was underneath you. Basically, it typically causes you to fall relative to whomever you are over (or for them to fall onto you if you're underneath them). So basically, what is happening is that the lower jumper is distorting the air flow, which changes the wind resistance, which typically causes you to fall faster - less wind resistance. It becomes more important to you once you are working on your fall rate, and becomes very important once you are jumping with others (non-instructors). Unanticipated burble drops can hurt both jumpers if they collide. Having said that, burble hops (where you plan on popping over the other jumper's burble) can be fun. It also plays a role in your deployment sequence. If your pilot chute is caught in the burble, there may not be enough wind resistance to cause the pilot chute to extract the pin and deployment bag, which would lead to a pilot chute in tow (a high speed malfunction that can be summed up as "very bad"). This is why when you throw out your pilot chute, you should give it a really good pitch. It's not something to be taken lightly: we lost a wonderful member of the dropzone.com community to a BASE jumping accident a few years back when her pilot chute was caught in her burble. Pitch hard. /Standard disclaimer: talk to your instructor about all of this. Anyone who takes advice off of the internet from someone he or she doesn't know is a fool. This is particularly true in my case. Quote Share this post Link to post Share on other sites
airtwardo 6 #8 February 19, 2008 QuoteThe pocket of air created above a jumper's body when he or she is in freefall. Yup....a low pressure area caused by the disturbance of air moving around your body...it can affect the altitude sensing devises you use as well... depending on their placement relative to your body position. ~ If you choke a Smurf, what color does it turn? ~ Quote Share this post Link to post Share on other sites
virulindex 0 #9 February 19, 2008 Ok. I think I've got it. Is this sort of like how ducks will fly in a V because the lead bird distorts the air flow for the birds behind him and so on down the line making it easier for the following birds to fly? Quote Share this post Link to post Share on other sites
airtwardo 6 #10 February 19, 2008 Quote Ok. I think I've got it. Is this sort of like how ducks will fly in a V because the lead bird distorts the air flow for the birds behind him and so on down the line making it easier for the following birds to fly? Speaking of which... Ever wonder why when ducks fly in a V formation, it's always longer on one side? More ducks one that side. ~ If you choke a Smurf, what color does it turn? ~ Quote Share this post Link to post Share on other sites
jakee 1,259 #11 February 19, 2008 QuoteOk. I think I've got it. Is this sort of like how ducks will fly in a V because the lead bird distorts the air flow for the birds behind him and so on down the line making it easier for the following birds to fly? Kinda sorta. More like the way that racing cars/ bikes/ cyclists can go faster with less effort when they slipstream close behind another car/bike/cycle.Do you want to have an ideagasm? Quote Share this post Link to post Share on other sites
NewGuy2005 51 #12 February 19, 2008 Think of the eddy downstream from a rock that is in the middle of the river. Quote Share this post Link to post Share on other sites
rtwats 0 #13 February 19, 2008 When you are driving on the highway and you have your hand out of the window you can feel the burble behind the rear view miror. Quote Share this post Link to post Share on other sites
MakeItHappen 15 #14 February 19, 2008 QuoteWhat is burble? Thanks! Anatomy of a Burble see also What Determines Fall Rate? .. Make It Happen Parachute History DiveMaker Quote Share this post Link to post Share on other sites
