Have a jolly fun question. BB gun HEAT Round

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guctony
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Have a jolly fun question. BB gun HEAT Round

Post by guctony »

Why nobody developed big bore HEAT rounds in WW2. 8 or 15 inch heat rounds could be interesting experience
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RangerJoe
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RE: Have a jolly fun question. BB gun HEAT Round

Post by RangerJoe »

Because they were not shooting at tanks. AP and SAP would work better.
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JeffroK
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RE: Have a jolly fun question. BB gun HEAT Round

Post by JeffroK »

Accuracy, HEAT rounds work better when not spinning, therefore they are usually fin stabilised (or are very complicated), their effect is severly degraded when fired from a rifled gun.

So if you tried to fire it from a 8/15" smoothbore gun you either have too many misses or have to get so close that your opponents 8/15" guns are drilling holes in your ship.

I believe the Germans made a 5.9" (150mm) HEAT round.
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EwaldvonKleist
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RE: Have a jolly fun question. BB gun HEAT Round

Post by EwaldvonKleist »

Generally speaking, HEAT allowed low velocity/low kinetic energy projectiles to be effective against armour. But it came with a price: The heat round will usually not cause as much damage as a classic projectile of same weight, since only a small share is injected through the burnt-in hole. In addition, HEAT shells tend to be vulnerable against spaced armour: The first layer detonates the shell, the second layer easily stops the (now dispersed) metal jet.
The above is not that much of a problem against tanks: A tank usually has no more than one layer of armour, and even a little bit molten metal is sufficient to take out the crew. But when dealing with a battleship, you will have many layers surrounding the important parts (cables, ammunition storage, machine rooms), and a small metal jet will cause negligible damage in a huge ship. What you need is a massive projectile ripping through the structure while staying intact, to set off the charge deep within the vessel.
Furthermore, ship guns need have high velocity&kinetic energy anyway for long range and precision, so there is no motivation to use HEAT in the first place.
Note that kinetic energy shells today are still preferred over HEAT against armoured targets when the gun is able to provide enough velocity, e.g. in the case of tank guns or long range artillery.
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RE: Have a jolly fun question. BB gun HEAT Round

Post by Scott_USN »

Don't really need HEAT with the Iowa 16 inch "A major alteration from the older guns was the Mark 6's ability to fire a new 2,700-pound (1,200 kg) armor-piercing (AP) shell developed by the Bureau of Ordnance. At full charge with a brand-new gun, the heavy shell would be expelled at a muzzle velocity of 2,300 feet per second (700 m/s)"

Perhaps the heaviest BB like Yamato could sustain a few rounds but I can't think of any cruiser or similar ship surviving even a couple of hits.

The HE round would probably kill or wound people even in armored compartments.

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RangerJoe
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RE: Have a jolly fun question. BB gun HEAT Round

Post by RangerJoe »

The HE round made nice swimming pools the size of tennis courts. [8D]
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Scott_USN
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RE: Have a jolly fun question. BB gun HEAT Round

Post by Scott_USN »

Just add water!

Oh wait may open up its own spring also!
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geofflambert
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RE: Have a jolly fun question. BB gun HEAT Round

Post by geofflambert »

The British discovered in the Falklands War that HEAT rounds in naval warfare were obsolete. All you need do is use a lot of aluminum (aluminium to them) in the structure and the ship will catch fire very nicely.

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RangerJoe
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RE: Have a jolly fun question. BB gun HEAT Round

Post by RangerJoe »

They should have known from the US involvement in Viet Nam that the aluminium M113 Armoured Personnel Carrier would burn when hit by a RPG heat round.
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Fishbed
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RE: Have a jolly fun question. BB gun HEAT Round

Post by Fishbed »

Here, this sums it up I think. As the others have pointed out, the tech used in a HEAT round makes it inefficient in all important aspects of naval combat: speed, accuracy & damage.

Here's the example of what a modern 120mm (which is pretty much the diameter of a 5 inch gun) HEAT round will do to a tank.

Image

Of course everybody's dead in there, but even a hole three times the size wouldn't exactly cut it against a battleship or even a cruiser, and would produce an underwhelming result - you'd need for the stream to travel meters into the ship to achieve anything. Only a naval AP round (that is a hardened round with an explosive filler - tank AP rounds are just metal rods, they would be inefficient by design too) has this ability to be fuzed so as to travel into the ship until it explodes from the inside.
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RE: Have a jolly fun question. BB gun HEAT Round

Post by Scott_USN »

It basically vaporizes everyone inside the tank, but as you said not really good in WWII because of the ranges. 20000 yards or even 10000.
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RangerJoe
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RE: Have a jolly fun question. BB gun HEAT Round

Post by RangerJoe »

120mm is about 4.7 inches.
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