This stumped me

[froggyfrenchman]

I guess its just one of lifes great mysterys. Wahts is the meaning of life, oh yeah... and would square bullets still be called rounds.

[Pixie]

Its makes KB a happier place when we get to talk about the wonders that are firearms and their ballistics.

A Bally Stick is wot Benson-Pope prefered.
And that's it.
Lock,stock and barrel



PS "lock and load" is out of sequence.

[Pixie]

Then there's the issue of drag v air resistance associated with objects with sharp corners travelling through the air etc.

There are exceptions:the Russians have a flat nosed torpedo that exceeds 300 kmh in water.The flat nose causes cavitation so there is no drag on the body of the torpedo as it is not in contact with the water.
The US is looking to use the same technology to allow a bunker buster to penetrate 100m of rock.

[idb]

There are exceptions:the Russians have a flat nosed torpedo that exceeds 300 kmh in water.The flat nose causes cavitation so there is no drag on the body of the torpedo as it is not in contact with the water.
The US is looking to use the same technology to allow a bunker buster to penetrate 100m of rock.

So why can't a fatty like me ride faster than my skinny mates.....?

[sAsLEX]

There are exceptions:the Russians have a flat nosed torpedo that exceeds 300 kmh in water.The flat nose causes cavitation so there is no drag on the body of the torpedo as it is not in contact with the water.
The US is looking to use the same technology to allow a bunker buster to penetrate 100m of rock.

I think the flat nose is not the only reason that it cavitates but the fact that exhaust gases from the engine are pumped into the void in front of the projectile.

[Ixion]

I think the flat nose is not the only reason that it cavitates but the fact that exhaust gases from the engine are pumped into the void in front of the projectile.

So why can't a fatty like me ride faster than my skinny mates.....?

Hm. So for a fatty to ride faster, it is necessary to pump fatty's exhaust gases in front of the projectile. Hm. Lez see . We need a fat rider , Metre of plastic tubing, LOTS of beans. Then we could be looking a a world speed record !

[jrandom]

There are exceptions:the Russians have a flat nosed torpedo that exceeds 300 kmh in water.The flat nose causes cavitation so there is no drag on the body of the torpedo as it is not in contact with the water.

Mmm hmm. The 'Skvall', if my memory serves me correctly. I believe it's referred to as 'supercavitation', since the cavitation bubble at that speed actually extends right past the rear of the torpedo. It's rocket-propelled.

It's not zero drag, of course, but you get to replace the drag of a metal body against water with the drag of an air bubble, which is significantly less.

Of course, the main problem with the Skvall is that as soon as it gets clear of the launch tube and the engine starts, it can be heard for miles and miles around, so it's a 'sneak up, let rip and run like hell' kinda weapon.

The Murkns seem to prefer the 'slow and quiet' design approach.

Have to admit though, there's a certain coolness factor to taking out the other guy's sub with a 300kph rocket-propelled torpedo.

[sAsLEX]

Mmm hmm. The 'Skvall', if my memory serves me correctly. I believe it's referred to as 'supercavitation', since the cavitation bubble at that speed actually extends right past the rear of the torpedo. It's rocket-propelled.

it can be heard for miles and miles around, so it's a 'sneak up, let rip and run like hell' kinda weapon.

thats why they refer to it as a revenge weapon, fire back at an incoming torpedo with a dirty big nuke in the thing and try blow the incoming torpedo and the sub that fired it


http://www.fas.org/man/dod-101/sys/m...row/shkval.htm

[jrandom]

thats why they refer to it as a revenge weapon...

Ah. Good idea. What'll they think of next, eh?

I'm working with an ex-Russian Navy chap at the moment who was an engineer on a sub for several years in the late 70s/early 80s. Would have been an exciting time, I imagine. I really have to try and get him talking about it. He's not very chatty.

www.fas.org

Good site. Bookmarked.

[sAsLEX]

I really have to try and get him talking about it. He's not very chatty.


Good site. Bookmarked.

hmmm well that era talking to the wrong people bout pretty much anything meant you met an untimely end. Classified stuff can stay classified for ages


Yeah it is very good actually

[scumdog]

Did you know the reason for copper jacket on bullets?
It (partially) holds the bullet in shape when the rifle is fired and when it hits the target but almost as important, it stops the rifling from being 'stripped' as the soft lead is rushed down the barrel, the bullet still gets out of the barrel - but has a shower of lead bits with it (ex-rifling) if the velocity get too fast.


And y'all thought this thread was boring and dead!!

[Sniper]

Never, Im glad you brought that up SD.

So, what is the purpous of a teflon coated bullet and does it still have a copper jacket? First correct answer gets bling.

[sAsLEX]

Did you know the reason for copper jacket on bullets?

but wait theres more

A full metal jacket bullet (or FMJ) is a bullet that is encased in a copper-coated steel or gilding metal jacket. The jacket prevents deformation of the bullet in the barrel or feed mechanism due to dirt, overpressures or damage outside the gun. This reduces misfires. The jacket also prevents fragmentation, and the coating helps prevent damage to the gun barrel.

FMJ ammunition was introduced ostensibly for humanitarian reasons, as the Hague Convention of 1899 prohibits the use of expanding or fragmenting bullets in warfare. (It is commonly but incorrectly stated that this prohibition is in the Geneva Conventions.)

They have the advantage in warfare that they often injure their target rather than kill outright, creating a casualty that needs to be cared for, but not a corpse. In this way, FMJ bullets can be more effective at consuming an enemy's resources than fragmenting bullets, yet the outcome for the victim is usually the same: death (or at least long-term removal from the field of battle, which is close to equivalent in military terms). Furthermore, because the bullet does not expand, FMJ bullets are much more effective at armor-piercing than hollow point bullets.

Most State Wildlife agencies prohibit the use of FMJ bullets in hunting.

[scumdog]

Never, Im glad you brought that up SD.

So, what is the purpous of a teflon coated bullet and does it still have a copper jacket? First correct answer gets bling.

Well, it's NOT to make it go through bullet-proof jackets... I'll let somebody else finish the answers and enlighten us properly!!

[sAsLEX]

Never, Im glad you brought that up SD.

So, what is the purpous of a teflon coated bullet and does it still have a copper jacket? First correct answer gets bling.

snipers use them to defeat body armour

edit: damn scum !!!!

and from http://matrix.dumpshock.com/raygun/basics/copkill.html : Their original KTW bullet centered around a case-hardened steel core. Even at standard velocities, this core would obviously hold its shape and drill through automobiles, cinder blocks and other materials likely to defeat conventional police handgun loads. This was literally the core of the solution, but presented difficulties. The hard core would not take rifling and would ruin the bore. A gliding-metal jacket with full teflon coating took care of this. The round gave good penetration but poor accuracy at long range.