And what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
I was right at the Vietnam DMZ and out along the ocean when the USS New Jersey first came on station... around mid-September 1968. She let off a broad side with her front two turrets and the blast was a wide as she was long. AMAZING!!!
It doesn't. There isn't enough mass in those 9 rounds to push a 45,000 ton (empty) ship sideways. Ryan, the Uss New Jersey curator tells why it doesn't. https://www.youtube.com/watch?v=7bUOCXHO3eU
It’s tempting to think that only the shells’ mass pushes a battleship sideways. In reality, recoil comes from everything expelled by the gun at high speed:
* Shell momentum: nine heavy projectiles fired at muzzle velocity. * Gas jet momentum: hot propellant gases exiting even faster than the shells. * Breech impulse: the backward force of high-pressure gases against the breech.
Even a 45,000-ton ship will recoil measurably when the combined momentum of projectiles and gases is transferred back to the hull—enough to nudge it a couple of feet.
And the fuckers they were aiming at never knew what hit them.
ReplyDeleteI was right at the Vietnam DMZ and out along the ocean when the USS New Jersey first came on station... around mid-September 1968. She let off a broad side with her front two turrets and the blast was a wide as she was long. AMAZING!!!
ReplyDeleteRead once the broadside would drive the ship sideways.
ReplyDeleteI heard all 9 at once would push it about 3 feet.
DeleteIt doesn't. There isn't enough mass in those 9 rounds to push a 45,000 ton (empty) ship sideways. Ryan, the Uss New Jersey curator tells why it doesn't.
Deletehttps://www.youtube.com/watch?v=7bUOCXHO3eU
It’s tempting to think that only the shells’ mass pushes a battleship sideways. In reality, recoil comes from everything expelled by the gun at high speed:
Delete* Shell momentum: nine heavy projectiles fired at muzzle velocity.
* Gas jet momentum: hot propellant gases exiting even faster than the shells.
* Breech impulse: the backward force of high-pressure gases against the breech.
By conservation of momentum:
M_ship × V_recoil = m_projectile × v_projectile + m_gas × v_gas + impulse_breech
Even a 45,000-ton ship will recoil measurably when the combined momentum of projectiles and gases is transferred back to the hull—enough to nudge it a couple of feet.
I wonder how many fish floated to the surface after the salvo.
ReplyDeleteCan't imagine what it would be like on the sending or receiving end of that broadside.......
ReplyDeleteAccording to US Marine "scuttlebutt" ... three 16" rounds would devastate an entire grid square. That's 1000 x 1000 meters.
DeleteThe sound and fury of freedom and civilization being maintained :-).
ReplyDeleteThere is a reason Iraqi soldiers waved their underpants and tried to surrender to USS New Jersey's observation drone during Gulf War I.
ReplyDeleteThey had seen what happened to the adjacent grid square after a salvo, and wanted none of that nonsense.