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Perlan High Altitude Tow Plane



 
 
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  #31  
Old August 25th 18, 02:18 AM posted to rec.aviation.soaring
kinsell
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Posts: 294
Default Perlan High Altitude Tow Plane

On 08/24/2018 06:55 PM, Martin Gregorie wrote:

Judging by an article by Jean-Marie Clement in Sailplane & Gliding (Dec/
Jan 18 p40) the Perlan Project may have missed the boat for setting a
properly high record. M. Clement says that climate change has stretched
the Andean wavelength by causing and increase in wind speed, so it is no
longer in phase with the mountain topography. This weakens wave lift
while the increased wind speed has also reduced the duration of weather
cycles. He talks about having to accept 2-3 m/s wave climbs in 2017 where
a decade ago they'd have had 5-8 m/s, but adds that the vertical velocity
in hydraulic jumps wasn't affected though the jumps may have become more
frequent.



https://www.youtube.com/watch?v=I-cZzVA0Gcc
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  #32  
Old August 25th 18, 05:24 AM posted to rec.aviation.soaring
Eric Greenwell[_4_]
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Posts: 1,393
Default Perlan High Altitude Tow Plane

kinsell wrote on 8/24/2018 6:18 PM:
On 08/24/2018 06:55 PM, Martin Gregorie wrote:

Judging by an article by Jean-Marie Clement in Sailplane & Gliding (Dec/
Jan 18 p40) the Perlan Project may have missed the boat for setting a
properly high record. M. Clement says that climate change has stretched
the Andean wavelength by causing and increase in wind speed, so it is no
longer in phase with the mountain topography. This weakens wave lift
while the increased wind speed has also reduced the duration of weather
cycles. He talks about having to accept 2-3 m/s wave climbs in 2017 where
a decade ago they'd have had 5-8 m/s, but adds that the vertical velocity
in hydraulic jumps wasn't affected though the jumps may have become more
frequent.



https://www.youtube.com/watch?v=I-cZzVA0Gcc


I don't remember the joke, just the punch line: "Talking to him is like explaining
off-street parking to a cranberry".

Now I'm wondering what other "-ologies" are confusing.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1
- "Transponders in Sailplanes - Dec 2014a" also ADS-B, PCAS, Flarm

http://soaringsafety.org/prevention/...anes-2014A.pdf
  #33  
Old August 25th 18, 01:32 PM posted to rec.aviation.soaring
[email protected]
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Posts: 557
Default Perlan High Altitude Tow Plane

"He has not so much brain as earwax."

William Shakespeare, Troilus and Cressida Act V, Scene 1
 




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