Forums: Skydiving: Safety and Training:
How Long ...?

Zoter

Nov 8, 2003, 10:02 AM
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If I exit at 13K and pull at 4K.......assuming I fall on my belly at approx 120mph...how long is my freefall...and is there a nice simple calculation to work this out that incorparates exit altitude and pull altitude?
I aint no mathematics teacher

Nov 8, 2003, 10:11 AM
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look in the front of your log book, there is probably a scale.

Clouds are my enemy

Nov 8, 2003, 10:14 AM
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At 4K you're about 24 seconds from certain death, at 3K it's about 18, and about 12 at 2K. Does that help?

-
Jim

Casch

Nov 8, 2003, 10:14 AM
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120mph = 176ft/s

The first 1K ft takes approximately 10-12 seconds, then every 1K ft after that takes approximately 5.5 seconds.

T = Freefall Time
E = Exit Altitude (i.e. 3 or 10 or 13 etc.)
P = Pull Altitude (i.e. 3 or 10 or 13 etc.)

T = ((E - P) - 1) * 5.5 + 10

Zoter

Nov 8, 2003, 10:35 AM
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Thanks...thats the ticket !

and damn....Jimbo... I was thinking about the time I just had...rather than the time I had left !!!! but thanks for the clarity anyways

(This post was edited by Zoter on Nov 8, 2003, 10:43 AM)

Nov 8, 2003, 11:37 AM
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Think of it this way, what's behind you isn't likely to hurt, what's in front of you though could kill you. (I suppose that wouldn't hurt for too long though. )

-
Jim

(This post was edited by Jimbo on Nov 8, 2003, 11:38 AM)

Blahr

Nov 8, 2003, 12:22 PM
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55 seconds freefall from 13k to 4k at 120 mph

Zoter

Nov 9, 2003, 3:03 AM
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Yeah jimbo there its important to know that side of the equation as well......although....I wont need to be so accurate that I can enter it in my logbook afterwards

Tonto  (D 515)
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Nov 10, 2003, 4:44 AM
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(I suppose that wouldn't hurt for too long though. )

Yeah - but it would be VERY sore...

t

lazyfrog

Nov 10, 2003, 11:36 AM
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do in meters... 50m per second...

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