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Slope & Dynamic Soaring

Talk about slope models and dynamic soaring (F3F in the forum below).

Subforums

  1. Regional Slopers

    Create a forum just for your region if one does not already exist.

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628 topics in this forum

  1. Slope and DS videos 1 2 3 4 56

    • 1,110 replies
    • 132,019 views
  2. Slope Flying Sites 1 2

    • 23 replies
    • 8,336 views
  3. Double-vision when flying?! 1 2

    • 26 replies
    • 703 views
    • 59 replies
    • 3,684 views
  4. NCFM Bluto 60" Slope

    • 3 replies
    • 113 views
  5. TJIRC Mini Q

    • 17 replies
    • 2,311 views
  6. Lundy Fest 2021! 1 2 3 4

    • 69 replies
    • 3,255 views
    • 9 replies
    • 264 views
  7. Ridge Rider

    • 8 replies
    • 223 views
  8. Calypso Contest Plus CoG? 1 2

    • 28 replies
    • 2,081 views
    • 2 replies
    • 175 views
  9. Slope at Sparsholt Firs

    • 6 replies
    • 348 views
  10. 60” Slope Racing 1 2 3

    • 45 replies
    • 1,055 views
  11. Rodent cg

    • 5 replies
    • 204 views
  12. Bopping up and Down ?

    • 3 replies
    • 223 views
    • 8 replies
    • 288 views
  13. Blejzyk IGI

    • 0 replies
    • 326 views
    • 9 replies
    • 364 views
    • 46 replies
    • 3,200 views
  14. Knap Hill (Pewsey Downs) - no model flying?

    • 8 replies
    • 587 views
  15. Ahi 1 2 3 4 6

    • 109 replies
    • 12,867 views
  16. NCFM Halfpipe build

    • 1 reply
    • 283 views
  17. Best slope model for a kid 1 2

    • 33 replies
    • 1,286 views
  18. Wizard Compact 1 memories

    • 3 replies
    • 400 views
  19. RCRCM DG600 Canopy

    • 1 reply
    • 356 views
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  • Posts

    • oipigface
      Ah well, there’s nothing new under the sun! On p82 of Sailplanes 1920-45 Martin Simons writes of the Darmstadt D-28 Windspiel: ‘The rudder was of an ingenious double action type. The front portion of the vertical tail was not a fixed fin but moved as a rudder. To it was hinged the rear portion, geared in such a way that it moved twice as much as the front segment.’ That was in 1933, when students at Darmstadt Technical University tried to build as efficient a sailplane as they knew how. The plane held the world distance record for a short time, but was wrecked when a powered plane landed on it at Griesheim aerodrome. It was replaced by the slightly heavier D-28b, which was also a good performer. Both planes were very pretty. It is not clear from Simons’ description whether the two parts moved in concert or in opposition, although I think that the description of the gearing suggests the latter.  It looks to me as if your elevator does the former. My grasp of formal aerodynamics is insufficient to analyse the issues here properly, but my intuition (always a bad guide!) tells me that an oppositional setup would induce less drag all other things being equal. Does anyone know?    
    • wookman
      Servos now glued in. Ballast weights to help hold them in place. 
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