1695

Item 1695

DESIGN: AeroVantage - Transition Mechanism - Proposed Methods - 1x2 - Underslung Arm and Pivot

What about a 1/2 scale UAV? See; 1695_FoldWings,jpg Note that any electronic sensors in the nose cone on the front proprotor will be reoriented between cruse and hover.

Overview:

Roll is by lateral cyclic in both rotors. There are no WingRotors.

Drawing:

The above frame and wing have been reduced in size. See .dwg file below.

1695_5.dwg

Drawing 1695_6.dc has a tandem arrangement of the 1x2

See; DESIGN: AeroVantage ~ Weight & Balance - Full Size - 1x2 - Underslung Arms

Notes:

The fore and aft PropRotors will probably rotate (tilt) in unison with parallel disk planes so that there is a balanced thrust about the craft's centers. The front PropRotor's wrist will rotate through a slightly smaller arc then the wrist on the Rear PropRotor. They can also be independently rotated for maneuvering, if required.
The elbow and the shoulder joints rotate in unison, with the shoulder rotating through a slightly larger arc than the elbow. The shoulder and the elbow will probably be mechanically interconnected to a common source of movement.
The front PropRotor is, at all positions, attempting to rotate the lower arm CW about the elbow and it is attempting to rotate the upper arm CW about the shoulder. I.E. the forward PropRotor is always attempting to transition from its cruise configuration to its hover configuration, while the PropRotor is operational.
The power for rotation may be electric or hydraulic.
Vane Type Rotary Actuator:

3-vane units can be used for all 4 wrists since the rotation as 90º or slightly greater.
If the rotation of the elbow and the shoulder can be kept under 160º then a 2-vane rotor will probably work.
Could the vane type rotary actuators be pneumatic, particularly since the rotations of all may be 2-position (at both ends of the rotation?
See DESIGN: AeroVantage ~ Control (Flight & Power) - Actuator - 1x2 Arm - Hydraulic It may be pneumatic.

Streamtube Locations:

See; DESIGN: AeroVantage ~ Trim, Stability & Control - Longitudinal During Transition - Transition & Longitudinal Balance

Link the retracting wheels to the rotating arms of the front proprotor.

Notes re Transition Mechanism:

Drawing:

The current thinking is that the shoulders, elbows and 4 wrists will all be mechanically tied together.
There will be a Port and a Starboard unit that are mechanically joined.
There will be four pneumatic rotary actuators; one at both shoulder and one at both elbows. DESIGN: AeroVantage ~ Control (Flight & Power) - Actuator - 1x2 Arm - Hydraulic Rotary
The strands of chain on both sides is to synchronize the rotations of the joints more than it is to transmit torque.
A linear adjustable flow damper may be located between the two strands of chain on each loop to act as a control on the speed of transition.
More force to rotate the PropRotor&motor assemblies will be required when they are near the cruise position then when they are near the hover position. Therefore have the angle of the levers favor the cruse position.
There are other alternatives such 4 as worm and wheels.
Operate the pitch (collective change mechanism on the 4 proprotors by a cam follower on the 90º rotation of the motor-rotorheads.

Pros & Cons(erns):

Pros:

The compressor and air tank might be used for cooling of the motor's common cooling radiator during vertical take off when the motors are operating under short term peak power.

Cons(erns):

The sweep of the arms results in the inability to connect the forward portions of the wings and fuselage together; except at the shoulder pivot centerline.

Initially displayed: November 18, 2008 ~ Last Revised: January 27, 2013

The above utility invention is openly and publicly disclosed on the Internet to negate an entity from patenting it, to the exclusion of all others whom may wish to use it. ~ Reference patent law 35 U.S.C. 102 A person shall be entitled to a patent unless - (a) the invention was known ... by others in this country, ..., before the invention thereof by the applicant for patent.