Helicopter Retractable Tank Assembly for Firefighting
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Solution Overview
Problem
The existing underslung long-line bucket system for Super Puma helicopters limits maneuverability, makes accurate water or fire-retardant material release difficult, poses entanglement risks, and has limited capacity compared to the helicopter's maximum lifting capacity.
Innovation Solution
A retractable tank assembly for helicopters, comprising a flexible bag connected to upper and lower frame structures, which can be suspended from the main rotor transmission using an attachment mechanism, allowing for increased storage capacity and improved maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a long-line bucket system is used for firefighting, then the helicopter can carry fire retardant material or water, but the long cables limit the maneuverability of the helicopter
Solution Approach 1:
The tank assembly is designed with a retractable lower frame structure that can dynamically change its position between retracted and extended states. This dynamic configuration allows the tank to be compact during flight for improved maneuverability and extended during operations for increased capacity utilization
Solution Approach 2:
The lower frame structure is designed to nest within or adjacent to the upper frame structure when retracted, creating a compact configuration that minimizes external presence and reduces interference with helicopter operations while maintaining the capability to expand when needed
2Adaptability or versatility
If a long-line bucket system is used, then the helicopter can perform firefighting operations, but it makes accurate release of water or fire-retardant material difficult
Solution Approach 1:
The attachment mechanism is extracted from the traditional long-line cable system and directly connected to the main rotor transmission, eliminating the intermediate cable that caused trajectory control issues. This direct connection allows for more precise control and accurate release of materials
Solution Approach 2:
The attachment mechanism serves multiple functions: it provides secure suspension from the main rotor transmission, enables precise positioning and control, and facilitates accurate material release. This multi-functional design replaces the single-function cable system
3Quantity of substance
If a long-line bucket system is used, then the helicopter can carry firefighting equipment, but the long cables pose entanglement risks with trees and objects
Solution Approach 1:
The retractable lower frame structure nests within the upper frame structure when not in use, eliminating the extended cables that caused entanglement risks. This nested configuration maintains firefighting capability while removing the harmful entanglement factor
Solution Approach 2:
The system dynamically transitions between a compact retracted state that eliminates entanglement risks during flight and an extended operational state that provides full firefighting capacity when needed
4Quantity of substance
If the bucket system capacity is increased to match helicopter lifting capacity, then more material can be carried, but the system becomes more complex and cumbersome
Solution Approach 1:
The retractable lower frame structure provides a dynamic solution that allows the tank capacity to be fully utilized when extended, while maintaining a compact configuration when retracted. This eliminates the need for an overly complex rigid structure to accommodate maximum capacity
Solution Approach 2:
The tank assembly is segmented into an upper frame structure and a moveable lower frame structure that can independently position. This segmentation allows the system to achieve full capacity without requiring the entire structure to be permanently extended, reducing overall complexity
Data Source
AI summary
A tank assembly for a helicopter is provided. The tank assembly includes a retractable tank for storing liquid or other substances. The retractable tank includes an upper frame structure. The tank assembly further includes an attachment mechanism attached to the upper frame structure and configured to engage a main rotor transmission of the helicopter to suspend therefrom. A helicopter including a fuselage, a main rotor transmission, and a tank assembly is also provided.