DESIGN: AeroVantage ~ Control (Flight & Power) - Actuator - 1x2 Arm - Hydraulic Rotary
(Vane Rotary Actuator), Pneumatic?
The rotation is 160º.
Stationary containment devices will take all of the rotor/motor generated loads when the transition mechanism is in its hover position and in its cruise position. This means that the actuators may be smaller.
Might it be viable to use large light Pneumatic Vane Rotary Actuators, in lieu of the pneumatic
The greatest moment may be at the elbow when the transition is close to the hover position.
Must be 2-position.
- Thrust x moment arm length / Pair of actuators = 700 lb x 78" / 2 = 27,000 in/lb = 2,275 ft/lb. Nuts ~ The Parker HRn700D weigh 100 lbs each.
A 3-vane should work for 90º and less, plus it should be smaller and lighter than a 2-vane.
A small amount of leakage past the vane should present a problem for 2-position actuators. This is because they will be up against their end stops and a hydraulic accumulator, plus occasional repressurizing, should hold position. Note that the holding pressure will slowly diminish until the pump is restarted.
A plug on each side of each vane will enter the exhaust's hole into the chambers at the end of the stroke. It will act as a cushion and it will seal the port.
- However, 3-position would allow for running takeoffs and landings.
- However, infinite positioning will allow for a variety of flight profiles.
- Concern: Rotation of the wrist may have to be more than 90º to allow an aft tilt of 10º to 15º during autorotation. The is so that the rotor disks can be tilted back 7º to 8º while the wings have a slight negative pitch. 90º + 15º which is still less than 120º may still be able to have 3 vanes BUT how does it hold the intermediate position?
- Sprocket probably goes on shaft, to connect fuselage with outer arm.
Parker - Hydraulic Vane Rotary Actuators ~ http://www.hyseco.com/image_uploads/item_series_1287345991.pdf
Parker - but pneumatic ~
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Last Revised: February 8, 2009