US Cartridge, 20mm HEI. How it works 

Many mechanisms have borrowed parts.

I ~kinda see that as well.....looked like that spherical piece was the "Primary Fuse" of the 'atomic bomb' portion, with the "Secondary Fuse" of the thermonuclear fuel in that "back casing"!!

This is a good invention. The rotor part requires precise manufacturing to ensure the operation of the fuse as a whole. This mechanism is often used in projectiles.

@@specialengineer2718 i was about to say something- but turns out yeah AA guns from ww2 use 20mils with rotors inside HEI rounds- im just weirded out by a bullet with electronics inside it- i mean 30-40 mm rounds dont have that-

@@Mr.hazu123 I've heard about using a 30mm rotor these days. In larger diameters, I did not meet the rotor, but I met rotary discs and clock mechanisms. Products with electronics are more expensive to use than mechanical products

Probably just so it can't detonate if dropped on the floor before firing etc, has to be spun by rifling to "arm"

@@untrust2033 spot on - it'll require a certain number of rotations (with the imposed spin from being shot down the rifling) to arm, that way it's basically impossible to hurt yourself - close range it's just a "dumb" round which will hurt but not explode. Accidental crush/damage/drop it's just inert.

Interesting question. I will try to find information about that and write you

Projectiles for for Oerlikon 20 mm weapon: HE Mark 3 Mods 1 to 64 (with fuze MK 26) HE-I Mark 3 Mods 1 to 64 (with fuze MK 26) HE-T Mark 4 Mods 1 to 28 (with fuze MK 26) AP-T Mark 9 (without fuze) AP-T M75 (without fuze) and other If you write me your email I will send you some part of the book

Thank you). Yes, also during transportation, careless handling, falling and etcetera.

“… and while being fired out of the gun, as it takes a few milliseconds for everything to get lined up, which means it needs to be fired and then leave the barrel before it’s able to go “bang!”

Actuall, my video has some inaccuracy: the rotor starts to rotate after leaving barrel, because the projectile in the barrel experiences axial overload. When the projectile stops gaining speed, the rotor begins to rotate

What caliber?

For 20mm?

Thanks)

The round is spinning due to the rifling of the barrel so the centrifugal forces basically push away the safety ring from the rotor.

Did you like working there?

i did. was in mechanical maintenance. 10 years.

Cool.

Glad you liked it)))

What do you mean - bolt fuze? Nowadays 20mm rounds only with the rotor

@@specialengineer2718 Regardless, the necessity of the rotation and the removal method of the pin is not clear.

@@specialengineer2718 I know it's for the primer to come infront of the pin so that it aligns itself over time, because of the unbalanced mass of the rotor. But a normal bolt type fuse of a similar size can do the exact same thing, which is pretty common for previous generation of 20mm rounds.

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JJmqyPVNmMo.html My video about previous generation. The requirements for safety and arming range have changed, so the use of a rotor has become appropriate. And even this is not the latest model of the fuze

@@specialengineer2718 Thanks, that's cool. Again, thank you.

HEI means high-explosive incendiary. Basically, the projectile hits the target with fragments of its body.

A few others in case you come across them: AP: Armor Penetrating: typically a solid shell with no fillers API: Armor Piercing incindeary: A solid shell that ignites shortly after impact HE: High explosive: Similar to this but in this one the explosive filler also starts fires (HEI is this one) APHE: A shell similar to this one, but the explosion is delayed with the intention that the shell has time to go deeper into armor first APCR: Armor Piercing Composite Rigid: a small, heavily pointed solid shell meant to penetrate or perforate the strongest armor. And of course utility stuff like smoke and tracers, tracers are lights that let the gunner see the shell in flight (usually has the suffix -T), and of course smoke shells to hide stuff from view. Then there's a bunch of modern ones I'm not as familiar with, but this will cover most of the WW2 stuff.

20mm HEI, M56A1 (M56A2, M56A3, M56A4)

No the safety ring opens up during the spin up (centrifugal force) allowing the rotor to spin on its axis and align with the striker.

The idea of using a rotor is that axial and centrifugal overloads are used simultaneously, occurring only when fired.

Not really, actually this is the impact fuze. But I want to animate some proximity fuze

This one is not a proximity fuse (variable time)..... point impact

20mm is a cannon, plus bullet designation is limited to below a given mass (in the realm of 500g if i remember correctly)

@@aber978 that bullet is no where near 500g, it's about half of that

No. these projectiles are not prohibited. They are very common and do not have specific features of hitting targets.

@aber978 is correct. Exploding bullets are prohibited in projectiles used in anti-personnel weapons such as pistols, rifles, machine guns. Yet .50 caliber guns are excluded because they are still classified as anti-aircraft munitions. It (the BMG/M2 round) and anything larger are classified as cannons and can use High Explosive, Armor Piercing, Incendiary and other such projectiles. But it is a given that all of these weapons are used against personnel all the time. Note: WWII hero Audie Murphy single-handedly killed over 100 German troops with an M2 .50 caliber machine gun while repulsing a German attack and received the Medal of Honor for his actions.