OTHER: Rotor Concepts
~ The essence of rotorcraft is the rotor. ~
Ideas for improving rotors, with particular applicability to twin laterally mounted rotors.
Improving the Configuration:
Intermeshing Rotors: This should be the optimal configuration for Light, fast and agile rotorcraft.
Interleaving Rotors: This may be the optimal configuration for future* medium and heavy, fast rotorcraft.
* Active Blade Twist is essential for the viability of the Interleaving configuration.
Improving the Lift/Drag Ratio:
Active Blade Twist: (ABT) varies the twist of the blades in relationship to changes in the forward velocity of the craft and collective settings. I.E. High twist during hover and low twist during fast forward flight and autorotation.
Independent Root & Tip: (IRAT) Separate pitch control of the blade roots and tips. A means of obtaining a fast rate and large amplitude Active Blade Twist; c/w Reverse Velocity Utilization.
Traversing Ideal Twist: (TIT) A rotor concept for providing a rotorcraft with forward speeds that are considerable faster than those of current rotorcraft.
There are numerous additional means of improving the L/D ratio of rotors, such as; advanced airfoil profiles, tip vortex reduction, fairing the blade roots into the hub, streamlining the hub, multiple leading and trailing flaps etc. However, the advantages of these methods are relatively insignificant when compared to the eventual incorporation of full active blade twist.
Increasing the Forward Velocity.
Large Chord & Low Tip Speed plus Pusher Propeller.
Variable Speed Rotors and Propellers
Reverse Velocity Utilization: (RVU) causes the root of the retreating blade to have a negative angle of attack at high forward velocities, so that the reverse airflow will create lift.
Independent Root & Tip - Reverse Pitch Rotor
Aerodynamically Variable PropRotor: (AVPR)
Improving the Flight Control:
Teetering Rotor with 3+ Blades, Constant Velocity Joint and Hub Springs (CVJ+HS) Rotor w/ Concentric Double Universal Joint and Hub Spring. [Constant Velocity Rotor] C.V. Teetering Rotor Concept (CVTR) A means of providing better cyclic control to 3+blade teetering rotors. One of the above two should be probably linked from the other.
Teetering Rotor with 3+ Blades and Offset Hinges. Could be called Interconnected offset flapping hinges.
'Absolutely' Rigid Rotor (ARR) A faster response to flight-control inputs and significantly reduced cross-couplings. This concept takes the advantages of the above (CVJ+HS) concept to the ultimate.
Variable Vertical Fin Concept (VVF) A means of improving yaw control for intermeshing helicopters.
Yaw Control for Twin Rotor Configurations, which have Independent Root & Tip control.
CVJ Teetering Rotor Concept (CVTR) This has become the first item above.
OTHER: Rotor Concept - Flight Control - Torque/Pitch Collective Rotor Hub
Reducing the Obliquity on the Intermeshing Configuration: To reduce the angle between the masts of the intermeshing configuration; thereby improving ground clearance and reducing the torque-pitch cross-coupling.
Intermeshing Rotors w/ Curved Dihedral
Intermeshing Rotors w/ Precone/Decone
Intermeshing Rotors w/ Curved Anhedral This idea may be wishful thinking.
One-Piece Hub and Spars
Reducing the Rotor Induced Vibration.
High Frequency Leading + Trailing Edge Flaps A reduction of vibration at the source.
High Frequency Modifiable Tip Control A reduction of vibration at the source.
Department of Demented Designs:
OTHER: Miscellaneous - Thoughtless Ideas
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Last Revised: May 17, 2010
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