Fixed VTOL Rotor Layout for Control-Surface-Free Forward Flight

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Solution Overview

Problem

Existing aerial vehicles face challenges in achieving efficient vertical take-off and landing (VTOL) and forward flight operations without the use of controllable control surfaces, particularly in optimizing lift and drag ratios and controlling attitude through rotor configurations.

Innovation Solution

The use of fixed forward-canted and forward-facing rotors, which are tilted forward slightly from vertical, provide forward propulsion during horizontal flight and enable VTOL and forward flight operations by manipulating rotor speeds for attitude control without controllable control surfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional VTOL aircraft use controllable control surfaces for attitude control, then attitude control capability is improved, but device complexity increases

Engineering Contradiction:

Improveattitude control capabilityVSAvoidcontrol surfaces

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent removes traditional controllable control surfaces (ailerons, elevators, rudders) from the aircraft design. Instead, attitude control is achieved solely through differential thrust manipulation of multiple rotors, extracting the control function from mechanical surfaces to rotor thrust differentiation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The rotors serve multiple functions: they provide lift during VTOL operations, generate forward thrust during horizontal flight, and enable attitude control through differential thrust. This multi-functionality eliminates the need for separate control surfaces, reducing device complexity while maintaining control capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If forward canted rotors are used to provide forward propulsion, then ease of operation is improved, but lift-to-drag ratio deteriorates

Engineering Contradiction:

Improveforward propulsion capabilityVSAvoidlift-to-drag ratio

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The propulsion function is segmented between different rotor types: forward canted rotors provide forward thrust component, while other rotors maintain vertical lift. This segmentation allows each rotor to optimize its contribution to overall aircraft performance, balancing forward propulsion needs with lift-to-drag efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The aircraft transitions dynamically between different flight modes by adjusting rotor speeds and thrust distribution. During forward flight, forward canted rotors engage to provide propulsion, while in vertical flight modes, all rotors contribute to lift. This dynamic adjustment optimizes the lift-to-drag ratio across different operating conditions.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If fixed rotor configuration is used for both VTOL and forward flight, then device complexity is reduced, but adaptability deteriorates

Engineering Contradiction:

Improverotor configurationVSAvoidflight mode adaptability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

Multiple rotors are configured to perform multiple flight functions without mechanical reconfiguration. By strategically positioning and angling rotors, the system achieves versatility in VTOL, forward flight, and transition modes while maintaining a fixed, simple structural configuration.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The aircraft achieves adaptability through parameter changes in rotor speeds and thrust magnitudes rather than physical reconfiguration. By dynamically adjusting operational parameters, the fixed rotor configuration can optimize performance across different flight modes, maintaining both simplicity and versatility.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration allows for efficient vertical take-off and landing, forward flight, and maneuvering without the need for additional control surfaces, enhancing simplicity and efficiency by optimizing lift-to-drag ratios and providing effective attitude control through differential thrusting and rotor speed manipulation.

Implementation Method 1

The forward canted rotors are tilted forward slightly from vertical and provide some forward propulsion during horizontal flight

Methodology Applied

Scientific EffectAerodynamic force: Aerofoil

Implementation Method 2

The aircraft may engage in VTOL operations and forward flight without the use of controllable control surfaces

Methodology Applied

Scientific EffectRotational motion generating force: Turbine

Data Source

PatentUS20260054830A1VTOL Aircraft Using Fixed Forward Canted Rotors With Forward-Facing Rotors

Publication Date: 2026.02.26 JOBY AERO INC

AI summary

A vertical take-off and landing aircraft which uses fixed rotors for both VTOL and forward flight operations. Some of the rotors are forward canted, while some of the rotors are forward facing. The forward canted rotors are tilted forward slightly from vertical and provide some forward propulsion during horizontal flight. The forward facing rotors may be fixed in a forward facing configuration. Forward swept wings allow for rotor placement which brings efficiency during hover operations.