Penetration on these new Battleships is pretty random. Like Bismarck has 700pen out of a 380mm/52 gun on 1000m. There are smaler guns that have more punch and things like Roma with 381mm/50 (so technically slightly weaker than Bismarck) but it gets 876mm pen. Even more than Yamato. So everything has more pen than Bismarck. Smaller guns have more Pen, Bigger Guns have more pen. And even the same caliber with even less caliber lengths has more pen than Bismarck and strangly everything else too. This makes no sense.
ps. Used Bismarck as example for things like Richelieu its also weird.
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Don’t Longer barrel also matters?
I looked it up. Barrel of Bismarck (without breach) is 19.6m and Roma 19m. So Bismarck has longer barrel (slightly) also got longer caliber length and has the same barrel caliber of 381mm. So how is Roma top dog with 876mm pen on 1000m and Bismarck gets cute 700mm pen? XD
Longer barrels are usually tied to a higher Muzzle Velocity, Barrel length itself doesn’t matter its the muzzle velocity that does in that regard.
Roma has more propellant for each round, and a heavier shell. This means it fires something heavier, faster, which means it has more kinetic energy and therefore more penetration.
Vanguard is the same story her guns are only l/42 compared to Bismarck and Roma at L/48.3 and L/50, having a heavier shell than Bismarck fired at a similar MV yielding more penetration than Bismarck.
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But 170mm pen difference? I mean as i said, even better than Yamato and those are ca.700kg heavier than Romas.
Radius of the shell is another relevant factor, you can shoot a bullet and a boulder with the same amount of energy but one is going to penetrate more.
Filler weight penalty is higher for 20 kg vs. 10 kg burster.
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Cause propellant charge is also matters.
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