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May 20, 2006

So, what was it?

I guess I've tortured High Desert Wanderer long enough...

And, my goad worked. Someone *did* get it. Not exactly in how it worked, but good enough for government work.

Pogue - I name you a Brainiac of Argghhh!

I would guess that it's an inertia safety for one of the rifle grenades on display in the castle.

Gezackly. More specifically, this one: The Serbian one that resides on the Yugo SKS in the Castle Collection. It is included in the picture of the "selection of rifle grenades" in this post. I can't believe *no one* commented on that, either. I guess I've got you all *really* desensitized, so that if we ever get the Castle to sufficiently to spec for SWWBO to think about letting you in the physical, vice digital demesne, you'll take it in stride all the ordnance laying about.

The bottom of the fuze element (the bit on the left) is the gain, the charge that (empty in the Castle example, of course) that initiates the bursting charge in the grenade body on the right (also empty, natch).

fuze and body of Serbian rifle grenade

Click here for the last picture, which will open in a new window.

On the left is the firing pin. When you remove the cap (the very top of the grenade in the first picture and the safety pin (the ring) the firing pin is free to move against the spring which holds it off the primer. When the grenade lands, point first, you've got enough oomph for the pin to overcome the spring and strike the primer.

On the right is our inertia safety. In the picture, the primer is aligned over the flash hole. The primer is the silver-looking part. When safe, that whole assembly is on the *other* side of the body, held in place by the spring-loaded peg in the upper left of the assembly. When the grenade is fired that peg, being held in place by a very weak spring, overcomes the spring's resistance and drops, allowing the spring in the primer assembly to move the assembly and get aligned over the hole - this takes enough time that if the firing pin *also* moves during the shock of launch it would actually drop into the hole on the left side of the assembly, and delay the movement of the primer assembly until the firing pin spring overcame the inertia and retracted the firing pin, thus allowing the primer assembly to move into place.

The whole point is to make sure the bang happens upon arrival, not departure...

That's all, folks.

That was nicer than Bill's farkin' gear!

Pogue, gimme a snail mail address and I'll get you a Brainiac of Argghhh! mug. I gotta scoot - I've got Charitable Things to do this morning. Someone else can get the H&I set up!