Bob,

I don't think you understood my explanation. Maybe I should have used
the word "teeter" instead of "tilt". A standard helicopter hub, which
includes most of them, only tilts or pivots on one axis. A scorpion
hub teeters on two axis.

What this means is that if you walk up to a bell or a robinson and
disconnect the linkages from the swash plate to the hub and allow it
to do its own thing, the r22 will only be able to tilt up and down in
the direction of the blades. The scorpion can flop around in all
directions including flopping to the side as well as in the direction
of the blades.

What I said was that the single axis helicopters create the illusion
of floping on two axis because they continually rock as they go around
in the circle. So if you look at a standard helicopter in flight from
the front and the helicopter is moving to the side, the disk plane
tilts to the side whereas the hub really doesn't.

I hope this clears up the differences between a regular hub design and
the scorpion.

Dennis H.


"Bob" wrote:

Dennis,
Do you know that a two bladed rotor system HAS to tilt? Do you know why?

I'll grade your answer.
Bob V.



Dennis Hawkins
n4mwd AT amsat DOT org (humans know what to do)

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