Staged Release Parachute Straps for Pusher Propeller Tangling

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Solution Overview

Problem

Parachute straps in aircraft with pusher prop configurations often become tangled, which can prevent or slow down parachute inflation during emergency scenarios due to interference with the pusher propeller, especially during forward movement or hovering.

Innovation Solution

The implementation of parachute straps secured using progressive and multiple stages of release bindings, point-to-point ties, and attachment to the fuselage surface to minimize tangling with the pusher propeller and other aircraft components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If parachute straps are secured using traditional single-stage bindings, then the parachute can be stored compactly, but the straps become tangled with the pusher propeller during forward movement or hovering

Engineering Contradiction:

Improveparachute deployment reliabilityVSAvoidstrap tangling with pusher propeller

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The parachute strap is divided into multiple sections that are bound at different locations along its length. Each section can be independently released in a staged manner, allowing the strap to be systematically unbound rather than all at once, reducing tangling risk during deployment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The parachute strap is pre-configured with multiple binding points and staged release mechanisms before deployment. The bindings are arranged so that they release in a predetermined sequence during parachute extraction, preventing tangling with the pusher propeller before the tangling can occur

Inventive Principle:

Principle #10Preliminary action

2Productivity

If parachute straps are released all at once during deployment, then the parachute can inflate quickly, but the straps become tangled with aircraft components

Engineering Contradiction:

Improveparachute inflation speedVSAvoidstrap entanglement with aircraft parts

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The binding system is segmented into multiple stages along the parachute strap length. Each binding point is positioned to release at different times during deployment, creating a controlled sequential release that prevents sudden strap movement and tangling while maintaining efficient parachute inflation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The binding system transitions from a static all-at-once release to a dynamic staged release mechanism. The bindings are designed to release in sequence based on the deployment dynamics, adapting to the movement and extraction rate to prevent tangling while maintaining deployment speed

Inventive Principle:

Principle #15Dynamics

3Strength

If parachute straps are routed close to the fuselage, then they are protected from external damage, but they interfere with the pusher propeller operation

Engineering Contradiction:

Improvestrap protection from damageVSAvoidinterference with pusher propeller

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The parachute strap routing is arranged in three-dimensional space to navigate around the pusher propeller arc. By utilizing vertical and lateral positioning in addition to horizontal routing, the strap can remain close to the fuselage for protection while clearing the propeller's rotational path

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS10625870B1Secured lines for ballistic recovery system

Publication Date: 2020.04.21 WISK AERO LLC

AI summary

A parachute is coupled to a rocket where the parachute is extracted by having the rocket pull on the parachute. A parachute strap couples the parachute to an aircraft where at a first point in time, a first section of the parachute strap and a second section of the parachute strap are both secured independently of each other. At a second point in time, the second section of the parachute strap is still secured while the first section of the parachute strap is released where the released first section of the parachute strap gradually becomes taut as the parachute is extracted.