Hacker News Reader

This reminds me of the arming fuzes in 40mm grenades. Basically the grenade needs to first be launched, then spun, then delayed some time before the grenade is armed.

The entire system is mechanical and is pretty interesting: https://www.inetres.com/gp/military/infantry/grenade/40mm_am...

View on HN

Yes. That's been the primary arming system for rifled artillery shells since WWI. They have to spin at high RPMs before they arm, something unlikely to happen by accident. Some have to experience the acceleration of firing plus high RPMs to arm.

i was going to mention Safing and Arming devices too! Apparently there's work going into making MEMS Safing/Arming devices that work like those devices (physically interrupting the explosive train) but are....lots smaller: https://ndiastorage.blob.core.usgovcloudapi.net/ndia/2015/fu...

Reply on news.ycombinator.com