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

 


Zoter

Nov 8, 2003, 10:02 AM
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How Long ...? Can't Post

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 Wink


Caseadilla  (D 27508)

Nov 8, 2003, 10:11 AM
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Re: [Zoter] How Long ...? [In reply to] Can't Post

look in the front of your log book, there is probably a scale.


Clouds are my enemyUnimpressed


Jimbo  (D License)

Nov 8, 2003, 10:14 AM
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Re: [Zoter] How Long ...? [In reply to] Can't Post

 
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
Post #4 of 10 (885 views)
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Re: [Zoter] How Long ...? [In reply to] Can't Post

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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Re: [Casch] How Long ...? [In reply to] Can't Post

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 Wink


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


Jimbo  (D License)

Nov 8, 2003, 11:37 AM
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Re: [Zoter] How Long ...? [In reply to] Can't Post

 
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. Wink)

-
Jim


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


Blahr

Nov 8, 2003, 12:22 PM
Post #7 of 10 (830 views)
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Re: [Zoter] How Long ...? [In reply to] Can't Post

55 seconds freefall from 13k to 4k at 120 mph


Zoter

Nov 9, 2003, 3:03 AM
Post #8 of 10 (727 views)
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Re: [Jimbo] How Long ...? [In reply to] Can't Post

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 afterwardsPiratePirateWink


Premier Tonto  (D 515)
Moderator
Nov 10, 2003, 4:44 AM
Post #9 of 10 (608 views)
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Re: [Jimbo] How Long ...? [In reply to] Can't Post

In reply to:
(I suppose that wouldn't hurt for too long though. Wink)

Yeah - but it would be VERY sore...

t


lazyfrog

Nov 10, 2003, 11:36 AM
Post #10 of 10 (548 views)
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Re: [Zoter] How Long ...? [In reply to] Can't Post

do in meters... 50m per second...



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