Spring-Powered Launch Canister for Folding Aircraft

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Solution Overview

Problem

Existing launch canisters for folding aircraft rely on compressed gas or explosive charges, making them difficult and costly to reuse, especially in field operations where propellant refilling may be impractical.

Innovation Solution

A system utilizing a housing with guide members, springs, and a launch mechanism that stores mechanical energy by compressing springs, which can be released to propel the aircraft using a latch and trigger mechanism, allowing for repeated launches without replacing or refilling propellants.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If compressed gas or explosive charges are used to propel the aircraft, then the aircraft can be launched out of the tube, but the launching canister cannot be reused without replacing or refilling the propellant

Engineering Contradiction:

Improvereusability of launching canisterVSAvoiddifficulty and cost of propellant replacement

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces the chemical propellant system (compressed gas or explosive charges) with a mechanical spring-based propulsion system. The spring is compressed using a hand-cranked winch mechanism, storing mechanical energy that is then released to propel the aircraft. This substitution eliminates the need for disposable or refillable propellants, allowing the launching canister to be reused indefinitely without replacement or refilling operations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If a mechanical spring system is used instead of compressed gas, then the canister can be reused, but the device complexity increases

Engineering Contradiction:

Improvereusability of launching canisterVSAvoidcomplexity of launch mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The hand-cranked winch mechanism serves multiple functions: it compresses the spring for propulsion, winds the spring to store energy, and can be used to reset the system after launch. This multi-functionality reduces the need for separate mechanisms for each operation, thereby minimizing overall device complexity while achieving reusability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system is designed to be manually operated and reset by the user without requiring external tools, specialized equipment, or complex automated systems. The hand-cranked winch allows the operator to compress and reset the spring mechanism directly, making the system self-sufficient and reducing mechanical complexity.

Inventive Principle:

Principle #25Self-service

3Speed

If explosive charges are used for launching, then the aircraft can be propelled quickly, but field operations become impractical due to propellant refilling requirements

Engineering Contradiction:

Improvelaunch speed of aircraftVSAvoidpracticality in field operations

Core Design Contradiction:

SpeedVSEase of operation

Solution Approach 1:

The patent replaces the explosive charge system with a mechanically compressed spring propulsion system. The spring is manually compressed using a hand-cranked winch, storing elastic potential energy that is rapidly released to propel the aircraft at high speed. This mechanical substitution eliminates the need for explosive propellants and their associated refilling requirements, making the system highly practical for field operations where speed is needed but propellant resupply is impractical.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enables efficient and cost-effective launching of folding aircraft by storing and releasing mechanical energy, allowing for immediate reuse of the launching system without the need for propellants, facilitating quick and multiple launches with minimal maintenance.

Implementation Method 1

one or more springs positioned around the guide members... energize the springs... apply the stored mechanical energy to the launch member

Methodology Applied

Scientific EffectElastic potential energy storage and release: Spring

Data Source

PatentUS8894007B2Systems and methods for launching a folding aircraft

Publication Date: 2014.11.25 STARK AEROSPACE

AI summary

A canister system for a folding aircraft may include a canister housing and a launch mechanism powered by one or more compression springs. A hand-operated drive mechanism may rotate a plurality of threaded rods to drive the launch mechanism from a released position to a cocked position, in which mechanical energy is stored in the springs. A latch mechanism may capture the launch mechanism in the cocked position. The canister may include a housing for receiving and storing the aircraft when the launch mechanism is in the cocked position. A trigger mechanism may release the latch mechanism, permitting the energy stored in the compressed springs to drive the launch mechanism toward the released position and propel the aircraft from the housing at launch velocity.