Deployable Vertical Stabilizer for Ejection Seat Windblast Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ejection seats in high-performance aircraft face instability during ejection due to extreme windblast, leading to uncontrolled trajectories and potential physical hazards for the occupant.
Innovation Solution
A stabilizer system comprising a collapsible support structure, an airfoil, and a deployment system, which includes a spring, gas piston, or linear actuator, coupled to the seat back or bucket, expanding to provide vertical stabilization and control the ejection seat's trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a collapsible support structure with airfoil is deployed during ejection, then trajectory stability is improved, but device complexity increases
Solution Approach 1:
The stabilizer system is divided into separate functional components: a collapsible support structure for mechanical deployment, an airfoil for aerodynamic stabilization, and a deployment system with spring or gas piston for actuation. This segmentation allows each component to be optimized independently while working together to provide trajectory stability during ejection.
Solution Approach 2:
The support structure transitions from a collapsed state during storage to an expanded state during ejection, dynamically adapting to the operational requirements. The collapsible design allows the stabilizer to be compact when not in use but provides full stabilization capability when deployed, resolving the contradiction between complexity and stability.
2Stability of the object's composition
If the airfoil is expanded to counteract windblast, then trajectory control is improved, but the force required for deployment increases
Solution Approach 1:
The spring or gas piston deployment system is pre-loaded before ejection, storing mechanical energy that is automatically released when the stabilizer needs to deploy. This preliminary action eliminates the need for continuous force application during deployment, reducing the instantaneous force requirement while maintaining trajectory control.
Solution Approach 2:
The harmful windblast force that creates trajectory instability is converted into a beneficial aerodynamic force by the airfoil. The same windblast that causes uncontrolled movement is harnessed to provide stabilizing lift and control, reducing the additional force needed for deployment and stabilization.
3Reliability
If a deployment system with spring or gas piston is used, then reliability of stabilization is improved, but device complexity increases
Solution Approach 1:
The spring or gas piston deployment system is self-actuating, automatically deploying the airfoil when triggered by the ejection sequence without requiring external control systems. This self-service mechanism improves reliability by eliminating complex electronic controls while adding only minimal mechanical complexity for the deployment function.
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 stabilizer system maintains the center of pressure within a safe range relative to the center of gravity, ensuring a stable ejection trajectory and reducing the risk of physical injury to the occupant by deploying an airfoil configured to counteract windblast forces.
Implementation Method 1
an airfoil coupled to the collapsible support structure... deploying an airfoil that counteracts windblast forces
Implementation Method 2
the deployment system includes at least one of a spring, a linear actuator, or a gas piston
Implementation Method 3
the deployment system includes at least one of a spring, a linear actuator, or a gas piston
Data Source
AI summary
A stabilizer system for an ejection seat may comprise a collapsible support structure configured to be coupled to a seat back or a seat bucket of the ejection seat, an airfoil coupled to the collapsible support structure, and a deployment system operatively coupled to the collapsible support structure and configured to expand the collapsible support structure.