If our lab tests continue on their current trajectory,” says Zachary, “we are confident in our prototype” [configurado con hemirrotor] It will have the most efficient hover and forward flight profile of any VTOL helicopter.
Blaenjet applies the Hemirotor concept to a subscale drone as part of a pathway to demonstrate how large manned and unmanned aircraft can scale in EVTOL applications, from configuration packages and cargo delivery to transportation and to tactical military roles. Can do.
Blainjet President Cary Zachary explored the setup while evaluating a series of digital models that combine rotor design with an electric drivetrain for Horizon Aeronautics’ “hoverbike,” a 9-foot-long, four-wheel-drive vehicle. feet wide. East. Short distance shuttle project.
|The Blaenjet could inspire new vertical lift technology with the aero hemi-rotor|
The Blaenjet’s “half-rotor” design places the familiar vertical-lift rotors (as seen on helicopters, UAMs, or drones) partially into opposite sides of an enclosed fuselage. There are also a pair of electric motors in the airfoil-shaped fuselage to drive the elevator rotors. A third motor located in the tailplane on an inverted V-tail drives a propelling strut.
The concept is to separate the reciprocating rotor blades from the moving blades, thereby neutralizing the reciprocating rotors. In hover, conventional open rotors generate equal lift in all directions. But when a conventional helicopter flies forward, its rotor blades move relative to the wind and away from it as it spins. This creates a lift irregularity on opposite sides of the rotor arc, eventually creating a hard speed limit.
Blainjett solves the problem by locking the inner half of each rotor disc inside the plane’s fuselage. The fuselage features an internal “floating door” and a series of upper and lower vents that aid in pitch and yaw control (and internal aerodynamic decompression) while hovering. Roll control is affected by the power absorbed by the lift rotors in the middle of the fuselage.
When hovering and transitioning to forward flight, the rotors on opposite sides of the fuselage spin in relative air (left rotor, clockwise – right rotor, counterclockwise). As the Blainjet subscale prototype transitions from hover to forward flight with thrust from its propeller, its upper vent doors are closed and the retractable rotor blades are protected from relative wind, negative drag, loss of lift and possible downforce. which are high speed. The streamlined fuselage, along with the forward-facing blades, on the other hand, produced progressive lift.
This allows the rotors to slow down and stop in a fixed straight or swept wing position as forward speed increases. In this configuration, the rotors become fully articulated “wings”, with very little drag and therefore very efficient in forward flight. In the highest speed flight mode, they can actively sweep backwards, turning in the opposite direction for further drag reduction. The speed limitations imposed by the unequal drag and lift of compound-rotor designs are eliminated without the complexity, drag, and weight penalties of familiar tilt-rotor aircraft.
Positive and repeatable laboratory testing of the prototype hemirotor at various stages of flight showed the expected lift and drag profiles for semi-closed rotors in both rotary and fixed modes. The results confirmed the Blainjet’s basic assumptions and provided experimental data for construction during the next phase of testing.
The company has secured the use of the Vertiq electric motor module for integration into its next subscale prototype (V2). Vertic’s trolling motor modules are able to prevent rotation during selected flight phases and maintain an aerodynamically favorable fixed position or spin freely in the opposite direction.
Under a joint development partnership, Fenris Electric Systems will create custom flight controls.
As V2 testing of the Semidrone prototype progresses, Blaenjet is looking for potential manufacturing partners to help improve the concept and validate the design IP. Interested parties can contact Carrie Zachary as listed below.
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Blaenjet Aviation, an innovative aerodynamic propulsion technology start-up, announced that preliminary tests of its hemirotor aerodynamic concept have confirmed its ability to deliver faster and more efficient performance in VTOL aircraft.