Quote:
Originally posted by sapper740
He called this 155mm gun "reverse rifled" in that instead of the shell riding on the lands and thus requiring a driving band to prevent gas blow-by as with a standard gun, he devised a shell with "fins" that engaged grooves cut into the barrel which negated the need for the driving band thus making a more efficient, aerodynamic shell that could be fired with much greater charges as there was no soft metal band to leak gas.
|
This sounds a lot like the Woolwich Rifling from the late 1800’s where the shell had soft metal studs which fitted into grooves cut into the barrel.
There is also the Probert Rifling where the grooves become shallower until the barrel becomes a smooth bore towards the muzzle. The driving band is worn completely down to give a smooth aerodynamic shape. This was used on the British 3.7in Mk6 HAA gun which had an effective ceiling of 40,000ft.
Quote:
Originally posted by sapper740
Gerald Bull's ERFB shells also incorporated "base bleed" which helped to achieve the great range of this gun.
|
Isn’t base bleed now used for the extended range ammunition? The Canadian 105mm C3 has a range of 11.5km with the standard NATO ammunition, but has a range of 18km with the extended range ammunition.