Helicopter Tail Boom Watertight Bulkhead Design
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Solution Overview
Problem
Conventional tail booms for helicopters experience weight increase due to reinforced bulkheads for structural stability, which negatively impact the center of gravity and are not necessary for load redistribution, suggesting a need for a lightweight, non-structural bulkhead design that maintains watertightness.
Innovation Solution
A tail boom design featuring a non-structural bulkhead made of a baggy, impermeable fabric attached within a frame, which is structurally integrated but not involved in the overall mechanical behavior of the tail boom, allowing it to be lightweight and simple while maintaining watertightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional reinforced bulkheads are used for structural stability, then the tail boom gains structural strength, but the weight increases significantly
Solution Approach 1:
The patent applies this principle by replacing rigid metal bulkheads with flexible fabric membranes that are tensioned within the tail boom structure. The fabric bulkheads (e.g., made of Kevlar, nylon, or other high-strength-to-weight materials) provide the necessary separation and structural contribution without the excessive weight of traditional reinforced metal bulkheads, directly resolving the weight-strength contradiction.
Solution Approach 2:
The patent changes the material parameters from dense metal constructions to lightweight fabric materials with high tensile strength. By altering the material composition and structural configuration (from rigid panels to tensioned membranes), the bulkhead weight is reduced while maintaining adequate structural performance for load redistribution.
2Stability of the object's composition
If metal bulkheads with stiffening elements are used, then structural stability is improved, but maintenance requirements increase due to crack susceptibility
Solution Approach 1:
The flexible fabric bulkheads eliminate the crack susceptibility inherent in rigid metal constructions near the tail rotor. The fabric materials are inherently resistant to fatigue cracking and can be easily replaced if damaged, significantly reducing maintenance requirements while maintaining structural stability through proper tensioning and material selection.
Solution Approach 2:
The fabric bulkheads are designed as replaceable components that can be easily installed and removed. If damaged, the entire bulkhead can be replaced without complex repair procedures, treating the bulkhead as a consumable component that simplifies maintenance compared to permanent metal structures requiring inspection and repair.
3Force
If flat metal bulkheads are used for load redistribution, then load-bearing efficiency is improved, but the design complexity and reinforcement requirements increase
Solution Approach 1:
The tensioned fabric bulkheads achieve load redistribution through membrane tension rather than rigid panel stiffness. The fabric is stretched taut within the tail boom structure, creating an efficient load path that redistributes forces without requiring complex stiffening elements, ribs, or reinforcement features, thereby reducing design complexity while maintaining load-bearing efficiency.
Data Source
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AI summary
The present embodiments relate to a boom for an aircraft, and, more particularly, to a tail boom 3 for a helicopter 1, whereby the tail boom 3 may comprise a watertight compartment 7 and watertight bulkheads 5, 6. The watertight bulkheads 5, 6 may close at least one end of watertight compartment 7. Watertight bulkhead 5, 6 may include attachment device 8, frame 12, and watertight fabric 11.