Cambered Vertical Stabilizer with Blunt Trailing Edge
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Solution Overview
Problem
Designing a vertical stabilizer for aircraft that balances aerodynamic performance, structural integrity, and internal component housing while minimizing complexity and drag, particularly in rotorcraft where interactions with the tail rotor and airflow pose significant challenges.
Innovation Solution
A cambered airfoil design for both horizontal and vertical stabilizers that eliminates the need for slats, providing optimal yaw and pitch stability, anti-torque control, and housing for internal components, with a blunt trailing edge to reduce flow separation and drag, and is mounted to house a high tail rotor and internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional airfoil design with slats is used, then lift generation is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the slat mechanism from the airfoil design, extracting the complex moving parts while maintaining aerodynamic performance through an optimized cambered geometry. This eliminates the need for slats while preserving lift generation capabilities.
Solution Approach 2:
Instead of adding slats to improve lift, the invention inverts the approach by using a fixed cambered airfoil shape that inherently generates optimal lift without movable parts. The camber is optimized during design to compensate for the absence of slats.
2Manufacturing precision
If a pointed trailing edge is used, then manufacturing precision is improved, but flow separation and drag increase
Solution Approach 1:
The patent changes the trailing edge geometry parameter from a sharp point to a blunt shape. This parameter modification reduces flow separation and drag while maintaining manufacturing simplicity, as the blunt edge is more tolerant of manufacturing variations.
3Ease of manufacture
If a non-cambered airfoil is used, then manufacturing complexity is reduced, but yaw and pitch stability deteriorate
Solution Approach 1:
The patent applies local quality by incorporating camber specifically in the regions that affect stability (yaw and pitch) while keeping the overall airfoil shape simple. The camber is strategically positioned to enhance stability without adding complex manufacturing requirements.
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
The solution achieves strong aerodynamic performance, reduced manufacturing complexity, and improved reliability by minimizing flow separation and drag, while also providing anti-torque support and easy maintenance access, thus enhancing the overall stability and efficiency of rotorcraft.
Implementation Method 1
The airfoil structure is cambered
Implementation Method 2
The trailing edge is configured to form a blunt shaped edge... minimizing flow separation and drag
Data Source
Figure 1
Figure 2A
Figure 2B~2C
AI summary
In one embodiment, a vertical stabilizer (500) comprises an airfoil structure (510) configured to be mounted to an aircraft (100) at a vertical orientation. The airfoil structure comprises a leading edge (502) and a trailing edge (504), wherein the trailing edge (504) is configured to form a blunt shaped edge. The airfoil structure (510) further comprises a root end and a tip end, wherein the airfoil structure (510) is tapered from the root end to the tip end. The airfoil structure (510) is also cambered. Finally, the airfoil structure (510) is further configured to be mounted with a rotor (130), and is also further configured to house one or more internal components associated with the aircraft.