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Doug Riley
Doug Riley
Platinum Member
Last Activity: Today, 06:25 AM
Joined: 01-11-2004
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  • A gyro will not PPO, even in the presence of excessive in-flight blade flapping and low RRPM, unless its prop thrustline is higher than its center of mass. PPO is caused by misalignment of prop thrustline and center of mass, period.

    This is not to say that it is wise to maneuver in a...
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  • There's a further distinction to be made. Some prerotators are built to remain engaged after the takeoff run begins. With both the airflow and the prerotator accelerating the rotor, the buildup of RRPM during a run will be rapid. This type of prerotator will disengage automatically via the Bendix...
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  • Brian: If you use a joystick leverage ratio (3/4" to 1" per degree), then I suggest making the stick long enough to allow you to rest your forearm on your thigh. Overhead sticks typically have a longer throw than joysticks, and so precision movement of the hands is less critical. E.g. my...
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  • Doug Riley
    started a topic Forum look 'n feel

    Forum look 'n feel

    Is it possible for me to change the type size and color of the Forum pages that I'm reading? This microscopic, light blue print is murder on the eyes.

    Thanks, Mike or whoever.
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  • Brian: My take on the sense-of-direction of control sticks is this:

    Think of the stick (joy- or overhead-) as one radius of a circle. The center of the circle is the pivot at the opposite end of the stick from your hands (below your seat for the joystick; above your head for the overhead)...
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  • The question "Why not a V-tail?" is better flipped on its head: "Why do it?" Always start with majority, proven methods and only go elsewhere if you can improve on them. IOW, don't re-invent the wheel.

    The V-tail was a design fad decades ago, when it made its way...
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  • Doug Riley
    replied to Stabilizer versus Stabilator
    The stability problems with high-thrustline gyros have to do with the tendency of the FRAME to execute a forward flip. The rotor suppresses this tendency most of the time. If the rotor's thrust is reduced by a maneuver, turbulence or a control input, the frame's tendency to flip will rear its head....
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  • Doug Riley
    replied to Rotor head bearing bushing
    It's unusual for there to be an interference fit between the bushing and the inner race. I don't see a need for it.
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