Speed to Fly and Thermals

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Speed to Fly and Thermals
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Wing Polarhttp//parapente.para2000.free.fr/wings
/index.html
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Compare two Wings
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Travel Speed for downwind XC
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South Africa Thermals

• Highest temperature can be expected between 15.00
  and 17.00 in a day. Means thermals are highest
  late in the afternoon
•  Thermals start off in the day narrow and strong
  and become wide and weak in the late afternoon

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Chance of finding a Thermal
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Distance to next Thermal
Rule of thumb is that one needs 2.5 times the
height of a thermal to find another one. For
Dunnottar, low cloudbase days work best. 700
meters and a glide ratio of 6-7 4-5 km 700
meters x 2.5 1.8 km to the next thermal1500
meters x 2.5 3.8 km, just possible 3000
meters x 2.5 7.5 km, fly Welkom
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Where to find the lift under a cloud

•  On a weak wind day on the sunny side
• Or up wind and towards the sun.

For Gauteng area, wind is predominant NW. Sun in
the afternoon is shining from the NW, so look for
the lift in the NW corner of a cloud
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Thats all for today
Mort recommends that you got your recovery
organized
More at http//marca.homelinux.com/ulf/skygod/s2f/
s2f.html