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  1. Y

    Going public - How to make your work available to others

    I started working on my own little hang glider project in early 2016. The general mission was to build something fold-able enough to transport in a car foot-launch able easy to launch/fly/land performance like any of those "primary gliders" like the Superfloater / Sandlin's Goat etc. Even...
  2. Y

    What do you think about "e-soaring"?

    Tanner proposed this in his paper "Totwasserbeeinflussung bei Keilströmungen" in 1964. The idea is to decorrelate eddies in order to even out base pressure variations. It works, and has been implemented in different applications. It only pays however, if you have to live with a relatively blunt...
  3. Y

    Photos aloft

    Soaring the mountain wave up to FL235 near Jeseniky (Freiwaldau) Czech Republic in a DG300.
  4. Y

    CAD Model of human body

    That looks great! I am using FreeCad (.FCstd Fileformat) but can import several others (.igs seems to work every time)
  5. Y

    Reviving Brightstar Millenium

    I know, henryk. I know a few very talented hangglider pilots, including one former World Champion and FAI world record holder. (You know whom I am talking about, right?). However, that won't help me much. As I said, I am a reasonably skilled, moderately ambitious pilot, which means, my flying is...
  6. Y

    CAD Model of human body

    I am looking for a free source of human body models, I can incorporate into my plane cad models. Does anybody have a pointer (or models available). A model of a slightly reclined sitting person perfect, however other models are also welcome. Thanks!
  7. Y

    Reviving Brightstar Millenium

    SundayFlyboy97, if the "97" stands for your birth-year, then you are in the best age for building aeroplanes (which starts at around 17 and ends somewhere between 80 and 90). Now to your project: I had a similar idea some 7 years ago and started designing something that might come close to what...
  8. Y

    Reviving Brightstar Millenium

    I wouldn't recommend this to anybody without deep knowledge extensive experience in flying wing aerodynamics, FSI (aka aeroelastics) and advanced CFRP manufacturing. Günther was a fabulous guy, and frankly, he was possessed by the idea of building the best possible foot-launched sailplane. The...
  9. Y

    Reviving Brightstar Millenium

    Almost. Rochelt died from cancer. However a test pilot got killed testing the flair 30. (Another victim of aeroelastic phenomena)
  10. Y

    Telescopic Wing Design

    You won't need a telescopic wing for that. High AR wings complicate almost all aspects of airplane design. The unfortunate truth is: They are required for high aerodynamic efficiency. If low stall speed is your main design goal (on the low speed end), then just add wing area. You might have to...
  11. Y

    Need your opinion/honest advice, old motorglider

    And ASW24and the Cirrus. Actually it didn't hit performance as much, as you'd think it would. It reduced the Index by 2 Points from the higher performing gliders (ASW20, ASW24) and 1 point for the Astir CS and the Cirrus (IOW 1-2%). The main drawback of the system was its utter ugliness. Few...
  12. Y

    Need your opinion/honest advice, old motorglider

    Not sure it has been mentioned before, but the Mucha was the first SZD glider that did NOT use Casein as glue (if my memory serves right). I am not aware of any issues with the glue in any of the SZD-22 flying in Central Europe and the Mucha is still being used as trainer. So unless you have...
  13. Y

    Flying wing as cheap and simple option for basic fun flying.

    There were (at least) three different AV-36 in Germany, that failed structurally. One in 1980, one in 1983 and one in 2016. The BFU report of the latter suggests the failure was a combination of several issues. Apparently the elevator-spar broke first, leading to other structural failures...
  14. Y

    What do you think about "e-soaring"?

    [Low] drag bucket usually refers to a feature of the CL/CD function of a laminar airfoil. The section used in the SWIFT light doesn't exhibit a significant drag bucket, and if you look at the original SWIFT paper, you will find, that this effect isn't even mentioned there. You are, however...
  15. Y

    What do you think about "e-soaring"?

    The main difference between the SwiftLight and the Swift3 is of course the span, and the new wing section which was designed by Steve Morris. The first wing didn't survive the load test. After reinforcement of the same, the first flight tests were conducted, and the wing proved to be not stiff...
  16. Y

    Flying wing as cheap and simple option for basic fun flying.

    I looked for the Delka's accident report, but wasn't able to find anything. Do have any suggestions where to look, or whom to ask?
  17. Y

    Flying wing as cheap and simple option for basic fun flying.

    The Genair and the Prisair were state of the art paragliders back then and built the foundation of Ailes de K's success. State of the Art didn't mean all that much in the 1980s when it comes to building paragliders, though. The whole industry was still a bunch of young enthusiasts trying to...
  18. Y

    Flying wing as cheap and simple option for basic fun flying.

    The Delka was a really bad design (in almost every respect I can think of). It killed Didier Favre. Kalbermatten built rather questionable paragliders before, and the Woopys are something I personally wouldn't use to fly any higher than I'm willing to fall. I think it's good that Kalbermatten...
  19. Y

    What do you think about "e-soaring"?

    Noisy and not particularly efficient as means of propulsion, but for STOL applications it can be very helpful, since the ailerons will remain in the prop's slipstream even in deep stall situations. I would expect (sufficient power provided) that a configuration like this can "mush" down in stall...
  20. Y

    What do you think about "e-soaring"?

    Yes. (level flight at very moderate velocity). Probably not very practical, though.
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