m829a2 launch with Gun

[apapaso]

Hey!

Nice animation, but:

Where is the CONSERVATION OF ANGULAR MOMENTUM ???

Check the sabot's petals motion...

[bestamerica]

'

what to do with 5 pieces from this missile

[toro199999]

wow!!

[Mrking5555]

why is the outer cover on the round there to begin with if its just goin to fall off?

does it help "fling" the round or something?

[TheNovaAxon]

@Mrking5555

During the detonation of the propellant, the pressure is given to a much greater diameter/surface. This munition is a 120 mm tankround at firing, during flight it is a 45 mm tungsten steel penetrator that flies almost 2000m/sec. Thats very much kinetic energy. The abbreviation means something like: Armour Piercing Fin Stabilised Discarding Sabot, mostly followed by an 'T' which stands for tracer.

[transamrobws6]

@Mrking5555 The reason you have the sabot petals is to keep the penetrater(sub projectile) centered inside the guntube. Since the penetrator is considerably smaller than the diameter of the tube,the sabot petals are around it therefore making the petals plus the penetrator a projectile.

[pROTPANDA]

APFSDS's looses much of its energy if it rotates. Thats why smoothbore guns are used.

[raajadhepan]

yes, there is no need of rotation for this kind of projectile as it has a integral fin stabilizer......

[dergelarste]

Actually, you are both right. Yes, APFSDS rounds need the fin stabilizers for a controlled trajectory AND yes, there is no rotation induced by the barrel of the firing gun. Instead, the leading edges of the stabilizer fins are chamfered, much like the fins of an ordinary arrow that are attached in a certain angle, to induce a rotation of the projectile around its long axis by the air streaming around it. It actually needs a rather high rpm for a straight fligthpath.

[dealviinde]

I´ve heard the a 105mm sabot is able to travel over 50 kilometers. Do you know if thats true?

[dergelarste]

No, sorry, I don't know the maximum range of APFSDS's. I guess they vary from type to type. But the max range of these is not important because upon reaching it it will have most of its velocity bled off due to air resistance and the main reason this type of armor-piercing round is so effective is because applying a high amount of kinetic energy to a small area (E(kin)=1/2*m*v^2). But it's quite possible for it to reach 50km when fired in a steep angle (say about 45°).

[DaniusCaesar]

I'm pretty sure that even smoothbore guns still got SOME rotation... ofcourse, much less than a rifled gun, but still has some.

[lalalman2]

Actually there's no rotation at all.IF there was rotation,it wouldn't need the fin stabilizers

[DaniusCaesar]

No, you are wrong. There is SOME rotation anyway.

[lalalman2]

Rotation will result in an "O" shaped pattern in flight.Smoothbore rounds with fin-stabilizers are on a straight path in flight.

[DaniusCaesar]

yes. you are right

[gosciu555]

@lalalman2

There is some rotation, its needed for stabilization, even with fins.

[nhojohn]

@lalalman2 thing is, once the length to diamiter ratio is high enough, rifling won't stabilize the round any more

[jeffxu1234567890]

The rifling is less gradual than a rifled barrel, as it needs a little spin to aid fin stabilisation further on

[nhojohn]

@DaniusCaesar hate to tell you, but what you've shown is the rotation you would find in a fully rifled gun, although, i agree that a smoothbore will produce some rotation

[tamik87]

ahem.. the video isnt misleading, the sabot is for a 105mm abrams' cannon. And yes youre right nowadays' 120mm cannons are smoothbore. And abrams as well as leopard 2 uses the same rheinmetall 120mm L44 cannons (leo 2A6 uses L55) The discarding part of the round looks a bit different also. Far more simple than the one shown here.

[Esurnir]

Just a detail.

Today tank got smoothbore canon, which make your video a bit misleading

Unlike a riffle the apfsds won't actually rotate arround himself as far as I know. Unless fired from a rifle cannon.

[nemmie19]

I don't think the sabot "unfolds" that quickly, we used to shot quite abit 40mm APFSDS-T when I did military service, and you could see the sabot hitting the ground atleast 100-150 meters away. But it looks really awesome, and quite scary, the sabot itself will go through alot of things :)

[DaniusCaesar]

Unfortunetly I don't. Actually, any real APFSDS slo-mo will be great. If you find something, post it here also.

[nakazatoGTR]

got a video of a real m829?

[DaniusCaesar]

For real.

[nakazatoGTR]

so thats how it works