Jean Claude's latest activity

  • Jean Claude
    Yes, undoubtedly
  • Jean Claude
    Words and definitions changes depending on the messages. For example when you say that in vertical descent the speed forward is zero...
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  • Jean Claude
    The aerodynamic definition of "lift" is the force perpendicular to the direction of the speed. So, in vertical descent, the rotor has...
  • Jean Claude
    Jean Claude replied to the thread Electric Pre-Rotator.
    If 200 rpm of the electric spinner seems sufficient to you, why do not they seem sufficient to you with the mechanical spinner, since...
  • Jean Claude
    Yes, but my words were "To cancel the impact speed ..." During this phase of slowing down, the state is no longer "steady" and the...
  • Jean Claude
    During a gliding descent, aircrafts are not like a brick which regularly increases its speed of fall during the descent. To say that the...
  • Jean Claude
    The minimum mass for the helicopter concerns the mass of the blades, not that of the load. It is simply a matter of giving the pilot...
  • Jean Claude
    Certainly. And today, a 12 Hp engine weighs about 8 kg and it allows to takeoff in less than 300ft , rise at 600 ft/mn and flight 50...
  • Jean Claude
    The rotor adds about 5 kW of profile drag, which requires a more powerful and heavier motor, which requires a more solid structure, and...
  • Jean Claude
    A FW can fly with much less power. My JCD03 of 175 lbs and span 23 feets was powered by a 12 hp SOLO engine and a propeller 28 inchs...
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  • Jean Claude
    Jean Claude reacted to Aviator168's post in the thread Engine power for a ultralight with Like Like.
    Yeah. The push prop torque is much more apparant in an ultralight, and even more so when the rotor is not loaded...
  • Jean Claude
    Jean Claude replied to the thread Rotor blade chord.
    Entering the characteristics of MTOsport (392 kg) in my spreadsheet, I obtain a maximum L/D of 3.7 at 29 m/s At this moment, Parasitic...
  • Jean Claude
    Jean Claude replied to the thread Rotor blade chord.
    I also can't post an Excel file, while I did in the past A possible formula for profile power when forward speed is nul is: P = ¼...
  • Jean Claude
    Jean Claude replied to the thread Rotor blade chord.
    This is only true for an FW, but false for a gyro because the profile power of a rotor keep almost constant . In my opinion, relying on...
  • Jean Claude
    Jean Claude replied to the thread Rotor blade chord.
    Just change Cd*S from 1 (with no fairing) to 0.35 (about clean) at 50 mph allows 25% power less in cruise. Are you sure that...
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