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  1. D

    Passive Variable Pitch Propeller

    There is also a version (the "H" I think) that has a push-pull control which moves the upper stop and allows for a greater pitch. Kind of a "3-speed".
  2. D

    Pushers...way to go ?

    There have been several articles, discussion and concepts for pushers in Sport Aviation over the years. One interesting one proposed by Pazmany is attached. Enjoy...
  3. D

    New rotorcraft concepts

    Looks like a lot of download with all the area below in the rotor wake. Just saying...
  4. D

    Today's Sketch

    Vey Interesting. Looks very similar to a design by John Thorp. Check out Sport Aviation for his design.
  5. D

    Batteries - earthX vs Odyssey

    My experience with the PC680 for comparison. My PC680 lasted almost 4 years in my Cessna 140 with no issues. Just replaced it. The old one was put on an electric tug and seems to still be working well.
  6. D

    Practical Vertical Takeoff and Landing ?

    The reason for this approach is safety. The helicopter is flying through the corridor in the Height-Velocity diagram ("dead man's curve) where the helicopter can safely autorotate.
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