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  1. nickec

    Very low aspect ratio planes?

    Wikipedia mentions Dyke using wood to build a single seat delta. The Delta Stingray. It flew for 30 years before ending up in a museum. Anyone know which one?
  2. nickec

    Where have all the flying cars gone???

    "The Federal Aviation Administration (FAA) has awarded Terrafugia’s Transition “roadable aircraft” a Special Light-Sport Aircraft airworthiness certificate. Based in Massachusetts, Terrafugia called the certificate issuance a “significant milestone” for its eventual use in both the air and on...
  3. nickec

    The AFB (Amazing FleaBike)

    Burt Rutan made hand launch gliders to investigate planforms. He threw them from a roof. Remember: his company was named Scaled Composites. A reference to scale models. Toss some simple gliders. It is something aeronautical engineers do. I sometimes take 3x5 notecards and make...
  4. nickec

    OpenVSP Ground School

    Questions are often answered relatively quickly here: https://groups.google.com/g/openvsp
  5. nickec

    Double Eagle or other alternative cheap and easy builds

    R.S. "Veeduber" Hoover, may he rest in peace, addressed the challenges you face in his blog and elsewhere on the net. Spruce is not the only wood you can safely use. Various alloys can serve. It is not written in stone that 4130 be used. Ideally, you make simple samples and test them. No...
  6. nickec

    OpenVSP Ground School

    https://vspu.larc.nasa.gov/ At the link above you can find tutorials for OpenVSP. A parametric sketchpad for aircraft design. It is freeware supported by tax dollars which just keeps getting better - more powerful all the time. Many questions often posted to this forum can be answered by...
  7. nickec

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

    Here is much more information about the principles behind the Pneumagic efforts: https://www.researchgate.net/profile/Joep_Breuer/publication/40631756_An_inflatable_wing_using_the_principle_of_Tensairity/links/54ccc42b0cf24601c08b010d/An-inflatable-wing-using-the-principle-of-Tensairity.pdf...
  8. nickec

    10/23 Raptor Video

    See this report: Calculate Raptor-aircraft.com Traffic Worth and Revenue
  9. nickec

    Moment of inertia of Carlson spars

    Investigate skyciv.com - where an online calculator can help answer.
  10. nickec

    Informal testing for "minimum gauge" composite skin: hangar rash, handling

    What about when the impactor bounces? Perhaps these multiple strikes, at smaller velocities, are OK - because you can still compare results. Otherwise: an angled blow can serve. The target could be mounted at 45 degrees from vertical. Further, it might take multiple impacts to truly answer...
  11. nickec

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

    See this thread: Characteristics of a straight-wing, tailless model in the Langley free-flight tunnel Mike posted several times about his project.
  12. nickec

    Control surfaces chord percentage

    Having read about aircraft with one aileron, I muddy the waters of this thread with the preposterous notion: Just use one aileron. Weighs less. Builds faster. Sparks conversation wherever you fly.
  13. nickec

    The AFB (Amazing FleaBike)

    An abbreviated, yet useful, test: Connect three routed struts in a triangle. Connect three conventional solid wood struts of equal volume and lengths. Orient both on a bench and press down from one apex toward the opposite side. Compare the two for strength. Is one more easily broken? How...
  14. nickec

    The AFB (Amazing FleaBike)

    Testing the structure is a requirement. This is an unknown, untried construction method for which a formal analysis has not yet been done.
  15. nickec

    The AFB (Amazing FleaBike)

    Correct, Victor, it will stress the upright. Adding another strut there improves the structure. A better question: How can the loads best be routed? The fundamental truss concept puts members into tension and compression, avoiding side loading. The long single-piece member above the pilot...
  16. nickec

    The AFB (Amazing FleaBike)

    100% agree with lelievre. You have full triangulation forward of the front seat edge, full behind the seat back, and the four struts nearest the seat bottom see all the leverage. This will snap the vertical struts at the forward seat edge and, in addtion, likely destroy the area lelievre...
  17. nickec

    Why not roadable aircraft

    Although the title of the thread is why NOT, I prefer to concentrate on how to achieve a roadable. If baby steps necessitate lighter pilots at the outset, so be it. In time larger pilots would reap the benefits of the more wiry who proceeded them.
  18. nickec

    Why not roadable aircraft

    Based on the results of the Opener.aero Blackfly, and their posted figures, which includes a pilot payload of 250 pounds, I surmise the following: If a pilot weighed 150 pounds, then 100 pounds equals the maximum available budget for other usage. Let us use the 100 pounds for the powerplant of...
  19. nickec

    Peter Sripol is at it again...

    Just to make clear: I have no interest in saying Sripol's most recent craft sucks. It is what it is. It does seem to fit his mission.
  20. nickec

    Peter Sripol is at it again...

    When I first saw the structure connecting the fuselage to the wing, from a TLAR perspective, I thought it undersize. Milholland has seven tubes which appear larger in diameter than Sripol's. Sripol used nine tubes with three being very small - maybe even 3 rods, not tubes. Another...
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