1672

Item 1672

DESIGN: AeroVantage - Transition Mechanism - Proposed Methods - 2x4 - Pivoting Arms #5

Overview:

This page has probably been superceded by Pivoting Arms #6 ~ 1674.html. 1674 is similar to this page but it has a greater longitudinal stagger between the hovering PropRotors.

Pros & Cons:

Pros:

During hover both rotors are have a relatively high elevation.

All four PropRotor mechanisms are driven from one common x-shaft and actuator.

The thrust moments of the fore and aft proprotors neutralize each other at all positions, it looks like.

The mechanism is probably the simplest

Cons:

The ratio of extended hover length to contracted cruise length is not as 1742 and 1655.

Open the arms up a little in the cruise arraignment so that the torque of the X-shaft will start the transition.

Add the motor rotation mechanism.

Drawing:

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

Notes:

This mechanism is similar to 1642 except that on this one the moments resulting from both proprotor thrusts cancel out.

The mechanism is mounted on the wing's spar that runs from the port transition mechanism to the starboard mechanism.

The cruise gap is 85". The hover stagger is WAS 174.4". 172.5".

The mechanism consists of

At the end of the aft arm is the aft motor and Proprotor.

The rear motor and PropRotors are rotated 90º about the end of the arm. This is done by ...... a separate smaller rod that joins the motor and the main arm. This smaller rod maybe located inside the forward arm. The ratio on movement between the motor and the main arm is 2:1 and the angle of the outer minor arms will play no roll in these angles.

The whole assemblage (port and starboard mechanisms) are driven by one servo in the fuselage or wing root.

Description of Operation:

Concerns:

Calculations:

Last Revised: September 26, 2008

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.