How do grenade launchers work? Why doesn’t an uncooked grenade just come out harmlessly when it is shot?

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How do grenade launchers work? Why doesn’t an uncooked grenade just come out harmlessly when it is shot?

In: Engineering
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Grenade launcher grenades typically have some sort of arming fuse that enables the explosive to detonate after it has left the barrel of the launcher.

From my understanding, the common 40mm grenade uses a fly-wheel which allows the spinning hull of the grenade to generate a certain number of rotations before the impact fuse is lined up to detonate the grenade.

A grenade launcher doesn’t use an hand grenade, it’s specialized greande with a propulsion charge. It’s basically like a gun, you press the trigger which hit a percussion cap, this will ignite a propellant at the back of the grenade, just like with a bullet. But instead of pushing a bullet out of a long barrel, it propulse a large grenade out of small tube. This mean that the grenade is going at a relatively slow speed and its trajectory will do an arc to the target. Usually there is a system inside the grenade that arm it after it travelled a certain distance to make sure you don’t kill yourself with it.

What type of launcher and grenade?

Some set off a fuse after it’s fired similarly to a bullet. It goes off like a regular grenade.

Some have trigger tips, so when it’s activated and then smashes into something it’s like pressing the boom button.

Some are smart and can have the fuse be controlled to detonate at adjustable times or when impacting. These can be set to go off distance as well, so you could make it explode just as it enters a window to impact people taking cover. No more throwing the grenade back or jumping on it.