Category Archives: Design

Nerf Engineering notes

I’ve started organizing my writings and thoughts on Nerf ballistics into a set of notes (link corrected). Readers of my blog might be interested. For the moment my notes are very rough and incomplete. I’ll update the PDF as I make changes. I’d appreciate any feedback, especially corrections and ideas. Edit (2012-10-02): I’ve removed the […]

boltsniper’s optimal barrel length formula

Whenever there is a thread about one of the holy grails of Nerf ballistics, an equation for the barrel length that maximizes performance, someone is bound to mention the results of some tests boltsniper did in 2005 when he was designing the FAR. boltsniper, for the uninitiated, is one of the few engineers in the […]

Approximate expansion diameter of latex tubing

I previously wrote about how to estimate the expansion diameter of latex tubing, but I made no measurements to verify that the formula I suggested, where is the unexpanded inner diameter of the tube and is the unexpanded tube wall thickness, was accurate. Back in 2010, I made some measurements for tests that were aborted […]

FANG1 problems and solutions

Back in summer 2010 I decided that I should return to the “projectile-pusher” approach I used in FANG1. I gave up on this approach far too easily. FANG1 worked, but was unreliable. When I started planning FANG2 I considered the unreliability to be inherent to the projectile-pusher design and that nothing could be done about […]

How far in does a pipe fitting thread?

When drawing up homemade pneumatic Nerf guns in a CAD program, I used to wonder how deep a fitting would go in. Eventually I learned that technical drawings from McMaster-Carr and many other places offer this information in the listed “thread engagement”. See the drawing from McMaster-Carr below. Click on the image to view the […]