Whistling Spinning Grenade with Offset Apertures
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Solution Overview
Problem
Existing teargas grenades are ineffective in preventing individuals from picking them up and throwing them back, especially when used against prepared individuals wearing heat-resistant gloves, as they appear harmless and do not deter attempts due to being motionless and quiet after landing.
Innovation Solution
A whistling spinning grenade design that emits teargas through lateral passages and apertures, causing the grenade to spin rapidly and produce a loud, unpleasant whistling noise, making it difficult to grasp and throw while emitting gas, with a teargas generation component and ignition system integrated within a cylindrical body featuring offset exhaust apertures for propulsion and sound generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If teargas is emitted at high flow rate, then the time for a person to pick up and throw the grenade is reduced, but the grenade becomes motionless and quiet after landing, making it appear harmless and familiar
Solution Approach 1:
The grenade is designed to spin rapidly upon emission, transforming from a static object to a dynamic one. The spinning motion continues throughout the teargas emission period, making the grenade difficult to grasp and throw back, while also creating a loud whistling noise that serves as a deterrent to prepared individuals wearing heat-resistant gloves
Solution Approach 2:
The grenade generates a loud whistling noise through the interaction of exhaust gas flow with the spinning body, creating acoustic vibrations that serve as a warning and deterrent signal to potential attackers, while the spinning motion itself creates mechanical difficulty in grasping the grenade
2Object-affected harmful factors
If the grenade is made hot to prevent picking up, then bare-handed grasping is prevented, but it does not work against individuals wearing heat-resistant gloves
Solution Approach 1:
Instead of relying on thermal protection, the grenade uses dynamic motion (spinning at high speed) to create difficulty in grasping. The rapid rotation makes it physically challenging to acquire the grenade, regardless of whether the attacker is wearing heat-resistant gloves or not
Solution Approach 2:
The whistling noise generated by the spinning grenade serves as an acoustic deterrent that can penetrate through heat-resistant gloves, warning attackers of the dangerous situation without requiring thermal sensitivity
3Ease of operation
If the grenade is designed to spin and whistle, then it becomes difficult to grasp and throw back, but the device complexity increases
Solution Approach 1:
The grenade body is divided into multiple segments with separate functions: the main body contains the teargas generation component, while multiple exhaust apertures are distributed around the circumference. Each aperture has its own passage oriented at specific angles to create the spinning motion when gas is expelled
Solution Approach 2:
The exhaust apertures serve multiple functions simultaneously: they expel teargas to create the spinning motion, generate the whistling noise through gas flow interaction, and provide thrust to propel the grenade forward. This multi-functionality reduces the need for separate components
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 whistling spinning grenade effectively deters individuals from picking up and throwing it back by spinning rapidly and producing a loud, unpleasant noise, significantly reducing the likelihood of it being thrown back at security forces during gas emission.
Implementation Method 1
The teargas generation component may be proximate the ignition component such that combustion of the ignition component ignites the teargas generation component
Implementation Method 2
rotation of the grenade about the body axis is propelled by the expulsion of exhaust gas through the exhaust apertures
Implementation Method 3
each exhaust aperture axis being angularly offset from a radius connecting the passage to the body axis, such that it has a tangential directional component with respect to the sidewall
Data Source
AI summary
A whistling spinning grenade has a body defining a body axis and having a sidewall and a hollow interior, the body interior containing a teargas generation component and an ignition component, the body sidewall defining a plurality of passages, each passage communicating from the interior of the body to an exhaust aperture, each exhaust aperture penetrating the body sidewall and defining an exhaust aperture axis, and each exhaust aperture axis being angularly offset from a radius connecting the passage to the body axis, such that it has a tangential directional component with respect to the sidewall, and wherein rotation of the grenade about the body axis is propelled by the expulsion of exhaust gas through the exhaust apertures. The teargas generation component may be proximate the ignition component such that combustion of the ignition component ignites the teargas generation component. The passages and exhaust apertures may be all coplanar.