Zed's Technical Writings

Summary
In this blog entry, I use data published by The Slingshot Channel to come up with a simplified formula to predict the depth of penetration of slingshot projectiles in ballistics gelatin. Gelatin has some initial resistance to penetration, but once you get over 20m/s (65fps), you can expect the the projectile to penetration its own diameter...

I have done some further analysis of Jörg's high speed video. It shows Tobias shooting full butterfly, a style which he mastered. I was impressed and intrigued by his form and chose to look at it in more detail.

Here he is at the start of the...

Summary: In this blog entry, I explain the relationship between draw length and both kinetic energy and velocity using charts and a little physics. I go on to simplify the equations to show that:
Increase in kinetic energy is directly proportional to increase in draw length
Increase in velocity is approximately 70% of increase in draw...