Top Gear - Range Rover Sport vs Challenger 2 tank

BoneyDsays...

The use of the smoke blew my mind... must be some crafty 'tank crew vs sneaky people in the woods' trick (since I couldn't believe they fell for the ring-around-the-rosie 'maneuver'!)

Great fun!
(BF2 fan)

jimnmssays...

I want to know what the tank crew would have done if the wind wasn't blowing the smoke into the woods.

BTW, the first M1 Abrams had a 105mm rifled cannon, but was replaced by a 120mm smooth bore cannon in the M1A1 and M1A2 versions. The rounds fired out of the Abrams deploy stabilizing fins after it leaves the barrel, so there is no need to have a rifled barrel.

I also just looked up some specs on the Challenger2 and M1 Abrams. The challenger only does 40kph off road which is 24mph, the M1 does 30mph. I believe the German Leopard2 is currently the fastest tank.

BoneyDsays...

KaiEr, in my meagre grasp of the concepts of rifling physics - rifling provides stability to the projectile in flight, making it more resistant to external forces. Such as crosswinds, for example.

Picture how a spinning top is able to 'stand up' while it's rotating. The force that would want it to fall over in one direction is counteracted by it's 'gyroscopic' forces in the other directions. You can even knock it a little and it will still try to stay up (if it's spinning fast enough )

see: http://en.wikipedia.org/wiki/Gyroscope
and I spose: http://en.wikipedia.org/wiki/Rifling

Old 'smooth bore' weapons like muskets and flintlock pistols were inaccurate because their shots weren't protected by gyroscopic effects and were blown all over by the wind/rain/etc (also they weren't hugely aerodynamic or propelled quite as fast).

jimnmssays...

BoneyD, you are correct about the rifiling, however as I stated above, the ammunition used by the M1A1 and M1A2 tank have stabilizing fins which spin the projectile, making rifiling unnecessary.

BoneyDsays...

Sorry Jimnms, I haddn't intended to discount your comments at all. If you're referring to my 'smooth bore' remarks, I was demonstrating what used to happen with un-stabilised projectiles (ie. without rifling or fins)

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