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safety : Exit : The 6 Laws of Exit Order You Really Need to Know

The 6 Laws of Exit Order You Really Need to Know

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Image by Joel Strickland

Does exit order seem like some kind of obscure semi-religious ritual? Do you go through the motions without really understanding the moving parts?

If so, yikes--but you’re certainly not alone. Luckily, understanding the logic behind the order is a pretty straightforward affair, and the entire sky will be better off if you wrap your head around it. Ready? Okay. Commit this to memory.

1. In the name of science, get the $#&$ out.

It may seem like hollow tradition to hustle out the door on exit, but it’s not. As a matter of fact, there are serious calculations behind the art of exiting the plane efficiently. On a calm day, an aircraft on jump run covers around 175 feet per second of flight (that equates to a mile every 30 seconds or so). Translated into stopwatch terms, that means that--on that same calm day--no more than 60 seconds can pass from the moment the first jumpers leave the airplane to the moment the last jumper exits.

For practical purposes, taking into consideration how much ground the average square canopy can cover, every jumper in the plane has to be out during a two-mile jump run. If they don’t, some are bound to land out (or a chilly second pass is going to be served up to the sulky remainder).

2. Don’t mess up the pilot’s math.

If your group is about to be the first big handful of meatballs out of the plane but you suddenly split up into smaller groups, you’re messing with the pilot’s chi. After all, the jump pilot has more to calculate when he/she turns on that little green light than you might realize. He/she has to calculate about how much time each group will take to exit, and make sure the green light goes on at the correct distance from the DZ to accommodate the aforementioned 60-second countdown.

As a rule, the group that will have the slowest climb-out should leave first. Big group? Light goes on farther out from the DZ to allow for a slower climb-out. Little group? The light goes on closer to the DZ.

How can you help? Jump the plan you give manifest, and the pilot can give everybody a good spot.

3. Jealously guard your real estate.

If you’re a Big Sky Theory kinda jumper who assumes vertical separation is going to save you from a meat-traffic collision, you are not working from scientific facts. Horizontal separation is the only separation that really counts up there, so make sure your group has a chunky slot of sky all to yourselves.

Never place big bets (like: your continued existence) on your fellow skydivers pulling at the altitude they swear by. A tiny brainfart (or a big malfunction) will eat up that vertical separation before you can say “what happened to pulling at 3,500, toolbox?!.”

4. Horizon-pointing belly buttons go behind downward-pointing belly buttons.

When freefly folks get out first, they tend to become part of an undelicious freefall sandwich. Here’s why: On a typical skydive, a pair of freefliers will clock a 45-second freefall and open at around 3,000 AGL. Let’s say that pair is followed by a belly group with a 10-second climb-out.

This is going to sound like a math word problem, but bear with me: If one of those freefliers has a canopy with a 30MPH forward speed (which will move forward at around 45 feet per second, assuming little-to-no wind), opens 30 seconds before the belly group and turns right back toward the DZ, the variables are stacking up for a collision. Those 30 seconds of flight will drive the freeflier forward by about 1,300 horizontal feet--a measly 400 feet from the middle of the belly folks, which a solid six-second track can cover. If you add wind to the equation and the RW group gets blown even further into the path of the freefly pair, the likelihood of a meetup gets even uglier.

When freefly groups get out after belly groups, the picture gets a lot healthier. The fast fallers get their horizontal separation, predicated on their shorter climb-out and faster descent rate. Wind becomes a positive safety factor instead of a negative one; slower fallers simply blow farther away.

5. With longer flights comes greater responsibility.

Tracking groups, high pulls and wingsuits get to snuggle with the pilot (and/or the tandem pairs) in the way back of the plane. Why? First off, they’re mobile: if they’re doing it right, they’ll use all that horizontal power to get the hell away from jump run--and get back from a longer spot.

If they’re not doing it right, however, they’re fully within their capability to truck through everybody’s personal piece of sky on the way down. The moral of the story: longer freefall (or, in the high-pull case, general airtime) requires greater awareness and responsibility on the part of the nylon pilot.

6. Don’t be the heat-seeking meat missile.

That’s the bottom line, really. Everybody in the sky is counting on you.

(Me, for instance.)




By Annette O'Neil on 2016-04-14 | Last Modified on 2017-07-19

Rating: 12345   Go Login to rate this article.  | Votes: 12 | Comments: 4 | Views: 9806

4 Comments

wadebaird
wadebaird  2016-04-15

Nice to see articles like this coming out, but the math on #4 is off. If a belly group exits after a freefly group, they will open almost directly at the same place the freefly group opens. This article covers that in a much more straightforward fashion: http://www.dropzone.com/safety/Exit/Exit_Separation_Revisited_628.html

The canopy flight has nothing to do with it other than the first out people can cover more distance and will actually end up underneath the 2nd group out after them (not the first since the first will open right on top of them). I think this was confused with Bryan's opinions on steep angle flyers getting out before belly flyers. In these cases, they can fly back to jump run and end up in the airspace of the belly flyers.

I would've like to have seen a section on discussing not flying up or down jump run after opening for the exact same reason covered in #4, the distance traveled can be large.

In addition, wind doesn't have anything to do with "blowing" groups anywhere... it's just when there are higher winds on jump run, the ground speed is lower, so our actual seperation distance is different.


pchapman
pchapman  2016-04-16

These are hardly immutable "laws".

More like generalized statements.
Indeed some have their limits and if applied wrong, produce contradictory or opposite to the intended effects, while some have little value in creating correct actions. One might as add Law #7 = "Don't %$#$ up".

The reasoning in #4 is poor, making a messy explanation of the factors and relative influence of time of exposure to the wind, freefall speed, and canopy flight directions. (In addition being unclear about flying "back" to the DZ when the example only works for a spot prior to the DZ, which is unstated.)

Just because is able to write stuff doesn't mean one should about every subject.

That being said, it is very difficult to write something up coherent yet compact on the various factors affecting exits.


BrianM
BrianM  2016-04-19
1 out of 5 stars

I agree with previous commenters, plus, nothing at all about determining exit separation?

Oh, and nice job rating your own article...


NickByrd
NickByrd  2016-04-21
1 out of 5 stars

Miss O'Neil,

I stopped reading your articles for a while because quite frankly, I find them exhausting. You are far too concerned with making the article "cute" rather than providing quality information. The silly little phrases that you write make it hard to comprehend what it is you are trying to say, and it often gives me the impression that you are speaking beyond your expertise and trying to hide that with "fluff." I see that you are now submitting to Parachutist as well. I have yet to read anything you have put in the magazine, because you keep burning me on DZ with articles like this. The way you wrote this article will make it very hard for a student to understand what you are trying to say. I feel that you are wanting to educate the jumping community these articles. An educator should be clear and informative, not a "Carrot-Top" stage show. If you are going to put this out here for AFF students, A-License prospects and licensed skydivers to read, YOU have a GREAT RESPONSIBILITY to do better. Either cover the topic accurately and in full or please stop and stick to topics that you are qualified to cover.


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