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  • rotax618
    It looks like the UFO has a rib spacing (stringer spacing) of about 300mm, for an aircraft of the UFO’s performance I recon that you...
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  • rotax618
    A more stable vortex would form on that planform if the sweep from the nose to the false spar was less than the sweep from the false...
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  • rotax618
    I really don’t understand why a circular or eliptical wing would be any more difficult to build than a diamond shaped wing, a...
  • rotax618
    If the mission is to build a successful small LAR airplane that can operate in and out of a small field the formula is fairly simple. 1...
  • rotax618
    My experiments with LAR indicates that to perform well they need a very low wing loading, you can compensate with power but increased...
  • rotax618
    I was replying to bi_dg who's post advocated scaling up a couple of RC pure deltas. I did say that these types are not the subject of...
  • rotax618
    Dyke did design and build a single seat “Stingray”, it was of wood construction and flew for many years before being consigned to a...
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  • rotax618
    For a very light LAR the planform is important, a pure delta or a double delta as you have shown are not the best, the double deltas...
  • rotax618
    I built a couple of “Drifters”, and as Matthew said, their performance varies, I found the glide to be approx 8 - 12: 1. If you observe...
  • rotax618
    David Rowe reported that the power off glide of one of his UFOs was “about the same as a Drifter”. As far as using a rectangular centre...
  • rotax618
    Charles Zimmerman‘s original quest was to investigate the effect of span (aspect ratio) on wings with a Clark Y airfoil. His wind tunnel...
  • rotax618
    there is no washout, it only appears so because the disk is flat bottomed And the chord line is greater for the wider chord inner ribs.
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  • rotax618
    rotax618 replied to the thread Inverting a G13bb.
    A 4 bearing 3 cyl or 5 bearing 4 cyl crank should be strong enough if driven off the flywheel end, provided they are not fitted to an...
  • rotax618
    A LAR is not a plank and has a much larger “tail volume”. You can see the the small amount of reflex in the UFO.
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  • rotax618
    This may shed some light on the advantages of various planforms for a LAR wing. https://apps.dtic.mil/sti/pdfs/ADA397533.pdf
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