# Sword Measurement Protocol

In this post I share a detailed measurement protocol for swords and a measuring sheet that are intended to facilitate the collection of new data.

# Minimum effort, maximum efficiency

In this article, I discuss the widespread principle ‘minimum effort, maximum efficiency’ and how it should be handled with care…

# Modelling impacts and damage

This article is an attempt at the physical modellisation of weapon impact – blunt, cutting or thrusting. It explores how damage, represented as depth of penetration, depends on various properties of the target and weapon, and how difficult it can be to predict damage.

# Simulating Sword Properties

Over the years the topic of the simulation of the properties of swords has come up a number of times. This article describes a contribution I have made on this subject, and gives access to the code!

# Measuring swords as pendulums

This article describes a pendulum setup that can be used to measure swords’ moments of inertia with more accuracy and precision than with the waggle test. The device used is designed to be portable and easy to build for anyone.

# The Sword – Form & Thought

This post is a review of the exhibition and catalogue ‘The Sword: Form & Thought’. I have contributed a small part to both, working with Peter Johnsson on the computation and display of dynamic properties from his detailed documentation. The exhibition makes a beautiful display of various types of swords, and the catalogue contains a wealth of data and knowledge about the function and design of antique swords. Both highly recommended!

# On Silver’s times

George Silver is the famous author of an early printed work on fencing and martial arts in English, Paradoxes of Defence (1599). He is often quoted for having layed out universal principles in the form of his hierarchy of true and false times. Sadly, the most common interpretation of these does not fit the whole text. This post provides the necessary quotes to understand the causes and key properties of true and false times, which are in my opinion more interesting and less open to interpretation than the hierarchy itself.

# Représentation graphique de la distribution de masse

Ceci est une version française de cet article, suite à des demandes de lecteurs intéressés ! Il traite d’une nouvelle façon de représenter la distribution de masse des épées, à la fois intuitive, visuelle et objective.

# Visual representation of mass distribution

The mass distribution of swords is a well-known component of their performance and handling feel. Although sword makers have to control it through a variety of means, from a user perspective, only three parameters are needed to completely describe it: total mass, centre of gravity, and radius of gyration. They are well known of physicists. However, their values are not in direct relation with what we perceive when using a sword. Because of this, their usefulness has been questioned and their measurement in the sword community is still scarce. In this article, I will demonstrate how to build a more visual representation of the mass distribution of swords, with an application on five swords of my collection.

# History of the Centre of Percussion

This article explores the history of the notion of centre of percussion, how it has been conceived by physicists and how it was then transmitted to sword people and modified to better suit their practical experience.