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  • Marc Zeitlin
    It's funny - as someone who works with moldless composite construction airplanes every day, I feel the same way about AL planes - who...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    And it does. I've got a crude and introductory presentation on Canard Aerodynamics here...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    Good question. On the canards with the GU and/or Roncz airfoils, the aircraft (theoretically) trims itself to about 125 KIAS. A couple...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    Most, and possibly all, yes. The VariViggen's elevator hinge line was pretty far below the bottom surface of the canard/elevators, so...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    Both the GU and Roncz canard elevators used on Rutan derivative canard aircraft are also effectively slotted flaps, and the slot shape...
  • Marc Zeitlin
    Marc Zeitlin reacted to Topaz's post in the thread 10/23 Raptor Video with Like Like.
    The lack of rigidity/motions of the ailerons are far more likely to be causing the odd roll oscillations than some aeroelastic effect of...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    A cursory review of the first flight video disproves that theory. Raptor lifted off the runway at almost exactly 100 KIAS - clearly the...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    Probably not, given just a few inches of difference, and the size of the canard tip vortex. I'd be surprise if that was a factor - just...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    Sure - could be - just never had it in any of the canards I've flown that are similar in waterline position of canard and wing to the...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    I do not know who Mr. Andreen is or what his background or experience with Rutan derivative canard aircraft might be - canards on short...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    Just what you'd expect. Extremely crappy performance. But we actually have no idea what the power output is, nor what the issues with...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    COULD you? Sure - if Starship could have a swinging canard, you COULD do anything. As you say, a structural and control system...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    Take an awful lot of runway to get off the ground, even at SL on a standard day, assuming it could do so, and then climb like crap and...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    if the plane is designed correctly, then as long as you are in the approved CG range, a deep stall can not occur. But the answer is...
  • Marc Zeitlin
    Marc Zeitlin replied to the thread 10/23 Raptor Video.
    That seems a bit low - I’d expect the XL to be about the same as the COZY. I’d be interested to see the Phase 1 glide test data for your...
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