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How dissimetry of lift is managed in Bensen type gyroplanes?

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oriol

Well-Known Member
Joined
Dec 31, 2009
Messages
1,473
Location
Barcelona, Spain.
Hi all!


I am very intrigued with the rotor found in many light gyros like the Bensen type. I understand that the rotor is windmilling all the time and the pilot can only adjust the orientation of the rotor, without being able to modify the blades pitch in flight.

One can tell from pictures that the system to change the orientation of the rotor is pretty simple like that found on weight and balance aircrafts: two perpendicular bolts that allow for motion on all directions.

The thing is that Bensen seems to do well without having to displace the controls affected by precession? Perhaps he does not have to move the controls and the pilot bears with it moving the stick to the right to go forward etc...

However what intrigues me the most is, how Bensen does to avoid dissimetry of lift given that the blades can not flap, since they are bolted together in a single piece, and can not change pitch indistinctively either to overcome dissimetry of lift?


-)In the first picture below one can see clearly that the control goes straight to the rotor without any linkage or anything that can serve to avoid precession.
-)The second picture is curious, it shows a gyro with dual controls one that goes straight to the rotor and another one that goes below the pilot seat with some linkages that might(?) serve to deal with precession.
-)The third picture shows a standard rotor found in gyros. Although the blades can flap they can not do so individually to avoid dissimetry of lift.


Any input would be greatly apreciated!


Oriol


Bensen gyroglider on tow.JPGbensen_b-8m with dual controls.jpgGyrobee Rotor Head.jpg
 
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