Re: [popsjumper] World Record - Speed
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ThanX to all. To clear up any confusion myself and Morris from Germany tied for the fastest run at 2.44 seconds. I was flying a new velocity 103 loaded at 2.6
Re: [popsjumper] World Record - Speed
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Excuse my ignorance, i've been reading contradicting posts in various forums, have you guys finished CP nationals now? Or are they still coming up? If so, what were the results, who is on the team coming to SA later this year?
Re: [yuri_base] World Record - Speed
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Average speed is one thing, the speed at the entry gate another. We had speed measurements of up to 94mph in the past, so I guess we are closing in now on 100mph!
It is possible to roughly estimate the gate entry speed from the average speed and time.
When flying horizontally, you decelerate at the fraction of g that is equal to the reciprocal of your momental L/D:
a = g/(L/D)
For the rough estimate, one can assume constant L/D (which is not true - as you slow down, your canopy must produce the same lift - equal to your weight - at slower speed, therefore, it must change angle of attack and as a result, L/D is constantly changing. But for an estimate, the changes in L/D are relatively small if one exits the course with high speed still.)
Assuming L/D ~ 2.5, we have a ~ 0.4g.
If V0 is the gate entry speed and V1 is the course exit speed, average speed Vavg = (V0 + V1)/2 (for constant deceleration), and V1 = V0 - a*t, where t is time. So, Vavg = (V0 + V0 - a*t)/2 = V0 - a*t/2, and
V0 = Vavg + a*t/2 = Vavg + g*t/2/(L/D)
In this particular case, V0 = 28.6m/s + 9.8m/s^2 * 2.45s/2/2.5 = 33.5m/s = 120.6km/h = 75mph.
altough i never understand shit, i always love to read your posts that involve mathematics..
Re: [superwoman8433] World Record - Speed
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Does anyone know who the lady was that took the high-res pictures of my crash? I had given her my e-mail address so she could send me the pictures, but I wanted to contact her. Schwartz might know her, but I don't have Uncle Pete's contact info.
Re: [virgin-burner] World Record - Speed
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In Reply To
Average speed is one thing, the speed at the entry gate another. We had speed measurements of up to 94mph in the past, so I guess we are closing in now on 100mph!
It is possible to roughly estimate the gate entry speed from the average speed and time.
When flying horizontally, you decelerate at the fraction of g that is equal to the reciprocal of your momental L/D:
a = g/(L/D)
For the rough estimate, one can assume constant L/D (which is not true - as you slow down, your canopy must produce the same lift - equal to your weight - at slower speed, therefore, it must change angle of attack and as a result, L/D is constantly changing. But for an estimate, the changes in L/D are relatively small if one exits the course with high speed still.)
Assuming L/D ~ 2.5, we have a ~ 0.4g.
If V0 is the gate entry speed and V1 is the course exit speed, average speed Vavg = (V0 + V1)/2 (for constant deceleration), and V1 = V0 - a*t, where t is time. So, Vavg = (V0 + V0 - a*t)/2 = V0 - a*t/2, and
V0 = Vavg + a*t/2 = Vavg + g*t/2/(L/D)
In this particular case, V0 = 28.6m/s + 9.8m/s^2 * 2.45s/2/2.5 = 33.5m/s = 120.6km/h = 75mph.
altough i never understand shit, i always love to read your posts that involve mathematics..
congrats to everyone!
Me too!
Smarties are sexy...
(75 mph!)
(This post was edited by freeflybella on Sep 3, 2008, 9:53 AM)
Re: [superwoman8433] World Record - Speed
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It is the same colors as in my profile, but LoudDan has the exact same colors on his canopy as well. I was really trying to find who I had talked to about the crash pictures.
2008 nationalsopenoverall.pdf
Yeah baby!!!! 
