Recent content by Jean Claude

  1. Jean Claude

    Understanding Gyroplane Flight Controls.

    Oh, yes of course, but it is a very little: For example a 20 kts crosswind pushes the fuselage laterally by about 100N. If the rotor lift is 4500N then this requires 1.3 degrees of tilting ie ATAN(100/4500)
  2. Jean Claude

    Understanding Gyroplane Flight Controls.

    This which lengthens your run in crosswind conditions, is the unfavorable action of the cross tilting of the stick. No matter what the FAA says
  3. Jean Claude

    Understanding Gyroplane Flight Controls.

    Straight stick, full back, is good. The Adding a tilting to the side of the crossing wind decreases rpm acceleration, and not decreases the torque of roll like that of a fixed wing in asymmetrical flight, because this effect does simply not exist on a rotary wing.
  4. Jean Claude

    Understanding Gyroplane Flight Controls.

    My theoretical opinion is that, during the run, tilting the stick to the side where the wind comes from is a bad idea. Gyroplane rotor rpm is progressively increased during the run, by the airflow through it. Tilting the disc against the crossing wind reduces this airflow, and the rpm...
  5. Jean Claude

    my little wooden gyrocopter

    Our twobladed rotors require a low conicity to avoid excessive vibration. This conditions the choice of the blade mass. So, my wooden blades weighted with a steel strip to keep 18 lbs eaches (ie about 2.5 degrees of coning)
  6. Jean Claude

    my little wooden gyrocopter

    Chuck, For the reverse installation of the ROTAX 503, I have relied on other successful examples from other hobby builders, without any disadvantages other than faster soiling of the spark plugs. Regarding the stick to ceiling, I guess I will have to be patient to recondition my reflexes. I...
  7. Jean Claude

    my little wooden gyrocopter

    A member of the French gyroplane forum kindly changed the format of my video. It's here, Enter the password : JCD04
  8. Jean Claude

    my little wooden gyrocopter

    If you send me your email address in MP, I can send you 10 s of video in .MOV format which is not supported here.
  9. Jean Claude

    my little wooden gyrocopter

    Thank you all for your praise. Maybe it's better now than after the tests!
  10. Jean Claude

    my little wooden gyrocopter

    Yes Old 503. With scoop, gill, and inner sheath, I hope the cooling also good than by fan
  11. Jean Claude

    my little wooden gyrocopter

    The aircraft finally arrived at the field. First revolutions of its engine after twelve years of rest. Direct hand start by the propeller (as the "Cub") because I removed the hand launcher. No particular difficulties despite the gear box. Next tests will be the temperature of the cylinder heads...
  12. Jean Claude

    Effect of prerotation on takeoff distance

    In my opinion, under load, ELA blades twist less than Averso blades, because the ELA chord is balanced nearly 0.25 c "now fitted with Averso Stella" Of the Same diameter?
  13. Jean Claude

    Effect of prerotation on takeoff distance

    I agree with you, Xavier, Even without prerotation prolonged. I once simulated this take-off precisely and since the autorotation was already established The key point is that the propeller thrust still allows a comfortable forward acceleration, since the rotor drag is reasonable despite the...
  14. Jean Claude

    Effect of prerotation on takeoff distance

    Eric Changer's takeoff is irrelevant, because it is only possible by very low load and exceptionally high thrust-to-weight ratio (0.7). In these exceptional conditions, takeoff at high rpm (330) becomes possible because the gyro can take a lot of support on the tail wheel and lift the main...
  15. Jean Claude

    Effect of prerotation on takeoff distance

    We don't disagree, and that's what I've been trying to explain for a long time: The required competency you're talking about is just to change the standard procedure by the Cierva procedure. On this condition alone, a pre-launch higher than 2/3 of the flight rpm becomes beneficial. That's just...
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