The Ortego Helicopter featured a unique design that prioritized vertical lift through a novel power-to-rotor transmission system.
Key Design Specifications
- Propeller-Driven Rotors: Unlike modern helicopters where the engine turns the rotor shaft directly, Ortego's design used two propellers mounted on two of the four rotor blades to turn the main rotor.
- Engine: It was powered by a forward-mounted Lawrance A-3 two-cylinder air-cooled engine, producing approximately 28 hp (21 kW).
- Main Rotor: The craft featured a four-bladed main rotor with a 25-foot diameter. The blades had fixed incidence, meaning it lacked modern collective or cyclic pitch controls.
- Airframe: The fuselage was an open-framed, skeletal structure approximately 23 feet long, constructed from aluminum and boxwood.
Flight Control Mechanisms
- Directional Vanes: To maneuver, the helicopter used articulating vanes mounted outside the fuselage.
- Forward Movement: Controlled by a single vane mounted transversely at the front.
- Lateral Movement: Managed by two pairs of longitudinal vanes located near the front and rear.
- Vertical Rudder: A traditional vertical rudder at the rear provided basic directional control.
- Stability: A wooden framework was placed above the main rotor to provide necessary rigidity as the entire structure rotated.
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