Indians For Guns

Is there is any special reasons for the air rifle groove in clockwise turn ?

You mean besides the rifling imparting a spin to the pellet or is that what you were asking.

I wonder if it has anything to do with clockwise for the northern hemisphere and the other way round for the southern.

Good question.

Mack The Knife

Mack The Knife Bana";p="8283 wrote: I wonder if it has anything to do with clockwise for the northern hemisphere and the other way round for the southern.

Don't laugh!

Water does go down the drain in an anti-clockwise direction south of the Equator. There's a term for this but I can't recall it.

Mack The Knife

Mack The Knife,

This might be OT here but many years ago, ballisticians would look at the direction of rifling on bullets and judge immediately which handgun they were fired from. IIRC Colts had left hand rifling and Smith and Wessons had rifling that turned to the right.

Cheers!

mehulkamdar";p="8301 wrote: ballisticians would look at the direction of rifling on bullets and judge immediately which handgun they were fired from
Cheers!

Mehul just an addition rifling directions are still considerd for striation mark verification both in manual system and sophisticated system like IBIS.

Mack The Knife Bana";p="8297 wrote:Don't laugh!

Water does go down the drain in an anti-clockwise direction south of the Equator. There's a term for this but I can't recall it.

Mack The Knife

It's called Coriolis.This link's pretty informative
http://www.abc.net.au/catalyst/stories/s1604444.htm
Pran

Mack The Knife/Pran,

There might be an effect on drain water swishing down but I doubt this business of having one twist for the Northern Hemisphere and another for the Southern is anything more than a prank. SOme years ago there was some speculation about the hands on a clock facing resistance when they moved upwards and of them moving faster when they moved down but I remember that Nature and New Scientist both carried tests that showed that spring power alone was enough to negate any such effect.

What would be more important in a rifle or handgun would be matching the twist to the kind of projectile fired. If that is done there would be little difference whether the rifling was left or right handed. Considering that a round of even 22 lr ammunition releases much more energy at firing than a clock mainspring does from being wound, I doubt this effect would be anything at all on a target shot at any range that a gun is intended to shoot at, possibly at much longer ranges. You might say that a round comes to a halt at 1.8 x 10 to the power of -1 million mm or something of the sort using some mathematical derivation, but I doubt it makes any sense in the real world of shooting.

In any case, I have had more than a little correspondence with the SOuth African ballistician Chris Bekker and I shall ask him about this.

Nice one, Pran. That was indeed the name I was racking my brains for.

In any case, I have had more than a little correspondence with the SOuth African ballistician Chris Bekker and I shall ask him about this.

Don't think it will amount to anything other than a belly laugh but worth asking all the same. Thanks.

Mack The Knife