Hello,
Object where the exit point is at 70m, 9m lower there is a platform that we have to jump over it(3m long), the question is can we make it to jump over it or no, we made a few tests on the ground we tgink it s doable but not sure, that s why i am posting, we will never jump with a we "THINK" it s doable, does someone have expreience with it?
Have fun and keep low!
have a look at our website under construction : www.basedudes.com
Freefall, static line, or other?
Michael
Freefall
Standing or running exit? Running, I'd say that anyone with a good launch will easily clear a 3m obstacle after 9m of vertical drop.
Peace,
D-d0g
standing exit
If you exit with a 45° upward degree (with respect to horizon plane) launch with a "jump-from-still" (that would cause you to reach 2 m further (after 0.64 s) with respect to exit on the same plane, good launch indeed, but not too difficult to get it repeatable), would make you exiting with a projected speed on the horizontal plane (what indeed really matters in terms of horizontal separation from object) of 3.13 m/s, after 3 s you will have travelled horizontally of 9.4 m (separation from vertical of exit) and you have travelled 42 m in vertical. With a jump and throw exit, you can expect to have an open parachute above your head after 3 s from exit and 42 m below exit point.
Now. On a 70 m jump in freefall, I hope you jump and throw after not later than 0.5 s, which, in terms of BASE convention is the end of your freefall, but, de facto, until you have an open parachute over your head, your body is happily freefalling towards ground. With the above launch, after 1.5 s you have fallen vertically of 11 m and you have travelled horizontally of 4.7 m: just passed the 3 m protruding platform (which is at 9 m below exit point) clearing it of about 1.5 m horizontally. Having an open canopy above your head after 3 s of "physical" freefall of your body and 42 m vertically below exit point.
Yes, you can clear the 3 m platform (9 m below) but when you are open you will be 3 m closer to the vertical of the object than if the obect were vertical from exit point down to ground.
I.e., exiting from a vertical object with the above launch at the 3rd second of "physical" freefall you would have an open parachute above your head about 9.4 m off the (vertical of) object, jolly acceptable (in the end, it is the situation when we jump with a "jump-and-throw" jump off a B).
Exiting from your object with the above launch at the 3rd second of "physical" freefall you would have an open parachute above your head about 6.4 m off the (vertical of) object: quite close indeed to the obect itself!!!!! And you are quite close to ground as well (don't forget you are jumping a 70 m object!!!)!!!
There is another risk on this sort of jump: due to object's height, you pitch after 0.5 s - 1 m of freefall. It means that you would have your PC trailing "somewhere-behind-above-you" from 1 m below exit point down to 9 m where you expect to clear the platform: in my humble opinion, with only 1.5 m of clearance between your body and platfrom, there are chances that it gets caught on the platform itself/it hits the platform itself. To say even more: in the above conditions, there would be 1.5 m of clearance between your centre of gravity and platform: to make short a long story, your legs/feet would probably be even closer to platform, and possibly also your PC.
My opinion on such a jump? Not doable, not repeatable. Don't do it.
Much better to do a S.L. (Static Line) jump off the 61 m high platform, if all the other conditions (vented canopy, verticality, landing, etc.) are right.
Still there are folks who freefall from 61 m, but, then again, it depends on vented canopy, verticality, landing, experience, etc etc etc.
Finally: exiting from 70 m with a 3 m platform protruding 9 m below exit: I wouldn't jump!!!!!
Stay safe out there
Blue Skies and Soft Walls
BASE #689 :D
e-mail: base_689@yahoo.com
yes we already staticed the 61 meter exit point, we are freefalling 60m normally but the landing make it not possible, we use to make always 1 sec FF on low jumps, better for your line stretch...
Thnkx for all you tips Andrea and hope to see you soon in Low land..
Another way to test if you are ready for this sort of jump is to do a standing exit from the 9 meter platform at a pool and see how much vertical separation you get. From memory, it is quite easy to generate 3 meters of separation by the time one hits the water from 9 meters - or even from 6 meters really.
However, as important as the physical side of the jump is your mental state: if you are ready for the jump - and confident you can do it - it is already much safer than if you are worried at exit, unsure of yourself.
Peace,
D-d0g
Hello Ghosty,
you are welcome!
are you by chance BASE #684 or a friend/team mate of BASE #684?
Yes, I would love so much to make a really nice trip in low land!!!!! I hope to succeed in coming there one day!!! :7
Stay safe out there
Blue Skies and Soft Walls
BASE #689 :D
e-mail: base_689@yahoo.com
ghosty
i have sent you an email through your website
let me know!
cheers
Michael
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