Aircraft Beacon Light Stem Spacing Reduces Drag
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Solution Overview
Problem
Existing aircraft exterior lighting systems have a high aerodynamic impact and limited directional flexibility when mounted directly to the fuselage, which restricts their effectiveness and efficiency.
Innovation Solution
The aircraft beacon light system uses a stem and carrier structure with a mushroom-type design, where the stem has a smaller cross-section than the carrier, spacing the lighting system from the fuselage to minimize aerodynamic drag while allowing for unobstructed and more directional red-flashing beacon light output, incorporating LEDs, light optics, and a lens cover for efficient light distribution and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lighting system is mounted directly to the aircraft fuselage, then the installation is simple and compact, but the aerodynamic impact is high and the light output is obstructed
Solution Approach 1:
The lighting system is extracted from direct fuselage mounting and positioned on a separate carrier structure. The stem element separates the lighting system from the fuselage surface, allowing the light output to be unobstructed while reducing aerodynamic interference with the fuselage flow.
Solution Approach 2:
The lighting system is positioned in a different spatial dimension relative to the fuselage by using the stem and carrier structure. This creates spacing between the lighting system and fuselage surface, enabling the light to emit in directions that would otherwise be blocked while maintaining a compact installation.
2Device complexity
If the lighting system is mounted directly to the aircraft fuselage, then the installation is simple and compact, but the light output directionality is limited
Solution Approach 1:
The stem and carrier structure positions the lighting system in a spatial configuration that enables omnidirectional light output. The lighting system can emit light in all directions (360 degrees) rather than being constrained by direct fuselage mounting, providing greater adaptability for various operational scenarios.
Solution Approach 2:
The mounting structure is segmented into distinct components (stem, carrier, and lighting system) that can be independently positioned and oriented. This segmentation allows the lighting system to be optimally positioned for maximum light output in various directions while the stem and carrier handle the mounting function.
3Strength
If the stem cross-section is enlarged to strengthen the support structure, then the structural strength increases, but the aerodynamic drag increases
Solution Approach 1:
The stem cross-sectional area is optimized locally at different positions along its length. The stem has a smaller cross-section in the mid-section to minimize aerodynamic drag while having sufficient strength at the proximal end (near the fuselage) and distal end (near the carrier) to provide structural support. This local optimization balances strength requirements with drag minimization.
Solution Approach 2:
The stem cross-sectional parameters are carefully selected to achieve the minimum necessary strength while minimizing aerodynamic interference. The stem design uses parameter optimization to ensure it provides adequate structural support for the carrier and lighting system without creating significant drag on the aircraft.
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 provides a highly effective and unobstructed red-flashing beacon light output that meets Federal Aviation Regulations (FAR) requirements with reduced aerodynamic impact, enhancing both lighting effectiveness and aircraft performance.
Implementation Method 1
light optics for redirecting light from the light sources
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An aircraft beacon light (2) for being mounted to an aircraft fuselage (104) includes: a support structure (4), having a carrier (40), and a stem (42) for supporting the carrier (40) and for spacing the carrier (40) from the aircraft fuselage (104); and a lighting system (6), supported by the support structure (4), the lighting system (6) having a plurality of light sources (60), light optics (62) for re-directing at least a portion of the light emitted by the plurality of light sources (60), and a lens cover (68), with the plurality of light sources (60) and the light optics (62) being arranged between the carrier (40) and the lens cover (68); wherein the aircraft beacon light (2) is configured to emit a red-flashing beacon light output in operation.