1 / 9

Speed to Fly and Thermals

Speed to Fly and Thermals. Wing Polar http://parapente.para2000.free.fr/wings/index.html. Compare two Wings. Travel Speed for downwind XC . 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

roden
Download Presentation

Speed to Fly and Thermals

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Speed to Fly and Thermals

  2. Wing Polarhttp://parapente.para2000.free.fr/wings/index.html

  3. Compare two Wings

  4. Travel Speed for downwind XC

  5. 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

  6. Thermal probability Thermal probability 1.5 km 1.5 km 8 km 8 km 15 km 15 km 0.5 m/s 0.5 m/s 20% 20% 90% 90% 99% 99% 1.0 m/s 1.0 m/s 10% 10% 60% 60% 84% 84% 2.0 m/s 2.0 m/s 5% 5% 30% 30% 52% 52% 3.0  m/s 3.0  m/s 2% 2% 10% 10% 18% 18% Chance of finding a Thermal

  7. 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

  8. 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

  9. That’s all for today Mort recommends that you got your recovery organized More at http://marca.homelinux.com/ulf/skygod/s2f/s2f.html

More Related