Title:
CYCLOIDAL ROTOR OR PROPELLER WITH PERFORMANCE AND FLOWS OPTIMIZATION
Document Type and Number:
WIPO Patent Application WO/2017/175217
Kind Code:
A8
Abstract:
To eliminate stability issues in forward flight due to oncoming flow interfering with the flows produced inside the rotor, rotor shielding or enclosure are used giving it the ability to operate steadily at various forward speeds. Furthermore to improve performance and flows cycloidal rotor/propeller has blades travelling along generally non-circular and elongated track and is able to transition to a variety of other track shapes having corresponding blade orbit shapes. Track shape variation designs similar to such track designs for blade trajectory determination are used for the purpose of changing the blades pitch and their cross-sectional shape. One embodiment uses fixed elliptic shape track upon which run carriages connected to blade shafts. Said track can be inclined about its major axis thereby changing its shape projection onto the plane in which blades travel thus changing the elliptic shape of their orbit. Another embodiment during rotor's transitional phase of operation has computer controlled actuators dynamically varying the blades radial positions and thus their trajectory while each blade also runs on and flexes the track containing electro-rheological fluid in the pivots which, once desired orbital trajectory and corresponding track shape are reached and voltage is applied, instantly solidifies making the track rigid and the actuators disengage until the orbit has to change again. Third embodiment uses flexible track with size varying elements built-in; when these elements are activated in proper sequence by computer control system track flexes into shape corresponding to desired orbit shape. Fourth embodiment uses camshaft with continuous surface around which run rollers linked to blades. Camshaft's axial movement accomplishes change of camshaft cross-section shape being followed by rollers and accordingly results into orbit shape changes. Other embodiments feature the neutralization of centrifugal forces acting on the blades, adjustable shape and position vanes control the flows in, out and inside of rotor to further improve rotor performance, forward thrust and prevent rotorcraft destabilization.
Inventors:
BOGRASH PHILIP (IL)
Application Number:
PCT/IL2017/050401
Publication Date:
January 11, 2018
Filing Date:
April 03, 2017
Export Citation:
Assignee:
OPTIVECTOR LTD (IL)
International Classes:
B64C27/00; B64C11/00; B64C39/00; F01D7/00
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