KrisFlyZ 0
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borgy 0
there is no degredation at all, your indicated airspeed which is all that matters as far as lift and drag go is exactly the same as it is at sea level. your True airspeed on the other hand is very different. If your true airspeed was 120 mph at sea level at 25k in minus 20C you would be doing 185mph True!! unfortuatly you would have the decent rate to match it so you would glide exactly the same amount of distance in 1000 feet if you were in a no wind environment.
I only trust two people in this world, one of them is me and the other one aint you.
Nicolas Cage as Cameron Poe in "Con Air"
Nicolas Cage as Cameron Poe in "Con Air"
base283 0
Borgy is spot on. L/D ratio stays the same.
Take care,
space
Take care,
space
vesatoro 0
QuoteHeyhey..
Couldnt find it in 'the archives' so here's my question.
Is there any information (be it a rough estemate or rough GPS data) about the glide ratio a wingsuit gets higher up at say 25.000 ft?
There have been a few awesome high altitude distance crossings (both in wingsuit or with wing) like Gibraltar/English Channel, but on both of those, no data (or even just video in some cases) was ever released, even though initialy it was promised in both cases. And at the moment Id be quite curious to see how much our flight performance degrades in the thinner air, up high.
Jarno, the Gibraltar project gps data is downloadable at http://www.frwd.fi/images/recordings/4/Estrecho_1_(Skydiving).fwd
to display it you need a frwd player available at same website. I think it can also be transferred to google-earth to judge it on map.
Vesa
"Fear is the path to the Dark side"
(Master Yoda)
KrisFlyZ 0
QuoteBorgy is spot on. L/D ratio stays the same.
Take care,
space
In theory it should.
L/D = Cl/Cd and Cl and Cd are only dependent on shape is Aero 101 thinking. Drag is made up of Shape dependent and Lift dependent components.
In practice, L/D is better in the lower atmosphere(BASE flight altitudes). However, it is not possible to say that this is because of the denser air alone.
Kris
kallend 2,026
There is that old Reynolds Number thingy to think about!
...
The only sure way to survive a canopy collision is not to have one.
The only sure way to survive a canopy collision is not to have one.
robibird 3
.............it is embarrassing to see that after heaving the ram air technology over 30 years, that after heaving planes over 100 years, paragliders, hanggliders and kites above our heads over 20-30 years, that after heaving the access to almost any source and finally after hoping that basic is clear... it is embarrassing to even question such Q..
Robert Pecnik
robert@phoenix-fly.com
www.phoenix-fly.com
robert@phoenix-fly.com
www.phoenix-fly.com
mccordia 74
Care to explain what you mean by that Robi? As your wording is (to me) a bit confusing?
Is the question, weather a wingsuit flies less optimal at higher altitudes/thinner air embarrising?
Is the question, weather a wingsuit flies less optimal at higher altitudes/thinner air embarrising?
JC
FlyLikeBrick
I'm an Athlete?
FlyLikeBrick
I'm an Athlete?
robibird 3
Jarno,
It does not fly at less glide nor it flies less or higher than optimal.
Effect what often help us , and why base flights looks better is mostly, equipment, thermal weather condition and dedication of the flier (ground feedback) That is all. This was, I thought so clear.
embarrassing is to see that people here, who has higher interest in flying than average jumper questioning such clear fact which saying: Air dents has nothing with glide...
It does not fly at less glide nor it flies less or higher than optimal.
Effect what often help us , and why base flights looks better is mostly, equipment, thermal weather condition and dedication of the flier (ground feedback) That is all. This was, I thought so clear.
embarrassing is to see that people here, who has higher interest in flying than average jumper questioning such clear fact which saying: Air dents has nothing with glide...
mccordia 74
Seeing the varied replies from most people here and the ones I got over email/msn with the most varied concepts of how well or bad it would be gliding at higher altitude...I clearly wasnt the only one who wondered
JC
FlyLikeBrick
I'm an Athlete?
FlyLikeBrick
I'm an Athlete?
Back in October 2005 I went from 30000ft with a wingsuit, we managed data logging which gave an average or 53mph descent rate, up top I was in mid 40's for some time, first minute or so, lower its starts to speed up as you suffer fatigue in arms from position and cold.
Tha data logging is difficult as the temperature tends to screw a lot of equipment. So what i can tell you is from exit to deployment I went 8.5 miles, however that was with a 80kt head wind coming at us which obviousoly changed as we got lower.
I am planning another littlwe sortie to High altitude, however there are some limits to how high we can go, apart from getting airspace clearnace the right gear and support crew. The physiology of high altitude jumps can become pretty serious once your up to 40. The time of useful conscious if not pressure breathing is around 15 seconds at 40,000ft so you need to be on the ball and have a good team and gear. Luckily I had an excellent HALO jump master and a worldclass scientific company behind me with all preparation and altitide trainign facilities including chamber.
The temp and windchill is a mother but the view is pretty good. I had an exhasut valve freeze about 15 seconds out of the door and had to break the seal with facial contortions, Not impossible but a nuisance when your focussing on position and maintaining a heading.
I had twin thermal gloves with gortex liners and still at pull time good barely feel anything.
If you want any other info ask or Pm me.
Take care and have fun the view rocks.
Fraser
Tha data logging is difficult as the temperature tends to screw a lot of equipment. So what i can tell you is from exit to deployment I went 8.5 miles, however that was with a 80kt head wind coming at us which obviousoly changed as we got lower.
I am planning another littlwe sortie to High altitude, however there are some limits to how high we can go, apart from getting airspace clearnace the right gear and support crew. The physiology of high altitude jumps can become pretty serious once your up to 40. The time of useful conscious if not pressure breathing is around 15 seconds at 40,000ft so you need to be on the ball and have a good team and gear. Luckily I had an excellent HALO jump master and a worldclass scientific company behind me with all preparation and altitide trainign facilities including chamber.
The temp and windchill is a mother but the view is pretty good. I had an exhasut valve freeze about 15 seconds out of the door and had to break the seal with facial contortions, Not impossible but a nuisance when your focussing on position and maintaining a heading.
I had twin thermal gloves with gortex liners and still at pull time good barely feel anything.
If you want any other info ask or Pm me.
Take care and have fun the view rocks.
Fraser
Dont just talk about it, Do it!
Kris
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