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Old December 31st 05, 07:17 PM posted to rec.aviation.rotorcraft
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Default New helicopter designs

Stu,

I looked at your site on the Unicopter and Sychrolite and saw the
references to the rotor governor, but couldn't tell just how this device
was
supposed to work. I cautiously assume that it senses rotor speed and
collectively adjusts pitch to keep the blade speed at some pre-selected
rpm?


I assume that you are reffering to page http://www.unicopter.com/0575.html,
which is a sub page to http://www.unicopter.com/Governor.html. Actually, it
senses the torque to the rotor. By doing it this way, the application of
more torque from the engine to the rotor will immediately increase the
collective pitch. Conversely, the loss of engine torque lowers the
collective pitch to its autorotative setting. In other words, varing the
torque will vary the collective pitch. You will notice that Hunt's idea has
no provision for collective.


I also assume that the pilot would have an override for this feature?


Yes, on the idea in my web site, the pilot could still have a collective
stick. A primary difference is that the pilot would have to take action to
stop from going into autorotation, instead of having to take action to go
into autorotation.


An aside issue, you state that the need for yaw control of the Unicopter
would be more like a fixed wing.


The UniCopter is a unique rotorcraft, in that the rotors and blades have
'absolute' (actually ~ as close as is reasonably possible to absolute)
rigidity. In other words, the relationship of the blades and the fuselage is
'theoretically' similar to that of an airplane's wings and fuselage. The
technical chalange is the consideration of yaw during hover, which of course
the airplane does not have to consider.


Are you helo rated?


No. Only fixed wing.

Dave