NationStates Jolt Archive

Today, Rome unveils a new 1000 mm gun turret for the purpose of coastal defenses, as of today. This new weapon, dubbed, the "Ship Slayer" has effectively replaced the mobile emplacements on the Roman Coastal Defense Sea Wall.

Specifications are as follows:

Picture (http://machinations.sourceforge.net/images/screenshots/turret3.jpg)

Statistics:

Crew: 10 (Commander, Gunner, Electronics, Loader x7)
Armor: 15” Steel

Gun Weight: 2150 tons (About 2 million kg) (including breech)

Gun Length: 2040 in (51.8 m) (breech face to muzzle)

Bore Length: 2000 in (50.8 m)

Rifling Length: 1707 in (43.5 m)

Chamber Volume: 67,500 in3

Rate Of Fire: 1 round per minute

Note: The primer cartridge can be either electric or percussion fired. The rounds themselves are rocket assisted rounds.

Range: 166,488 yards (152.236 km or 82.2 nm) with nominal 1650 lb (750 kg) powder charge

Muzzle Velocity:7000 ft/s (1707 m/s)

On sale for $90 million per unit.

The Delkorian Military wishes to know if you plan to produce these turrets for sale, and if so at what price?

The Delkorian Military wishes to know if you plan to produce these turrets for sale, and if so at what price?

12 million per unit.

OOC.

Cost is severely underestimated, big guns have always been very expensive. It's also very light for its size... Suggesting to go to NS Drafroom to get it right - good idea, but currently needs corrections.

We wish to purchase 50 units for a price of $600 million.

We wish to purchase 50 units for a price of $600 million.

Expect arrival in about 6 months.

Edit: Order canceled due to price change.

OOC.

Cost is severely underestimated, big guns have always been very expensive. It's also very light for its size... Suggesting to go to NS Drafroom to get it right - good idea, but currently needs corrections.

Not really. It's basically the 406 mm gun already existence, except I multiplied the weight, gun length, etc. by 2.5, and increased the velocity and range by 4 to account for the rocket assistedness.

That said, The cost isn't really underestimated. Elite Arms has a similar gun (except substantially bigger) going for 18 million.

...Except that weight should be at least multiplied by 2.5^3=15.6. And that's for gun with static supports, because IRL due to stiffness requirements it grows as caliber^4, so it would be about 40 times greater, not 2.5.

Hence the cost rise involved.

It's also that even rocket assist doesn't bring velocity up to this, and 4x range requires only double velocity, et cetera, et cetera.
Not that I'm pressing on something, just an invitation to the NSD and the big design league.

That said, The cost isn't really underestimated. Elite Arms has a similar gun (except substantially bigger) going for 18 million.

It's actually substantially smaller. 508mm as opposed to 1,000mm. And it's PMT.

Since costs and such tend to increase exponentially with size...

Ok. I made changes to the weight and price. Any other suggestions?

Im no phsyics/ballistics/whatever expert, but I DO know that even a .22 calibur rifle has a pretty thick barrel. This thing is 39 inches, which means youve got a mini-a-bomb sending a shell flying out the barrel. Your barrel must be a foot thick at the sides to keep it from going bannana peel when you fire the gun.
Also, the motors to move it must be HUGE.
And, not to nitpick, but wouldnt it be fairly easy to send a cruise missile flying down the barrel of this thing? It'd be REALLY bad if that shell went off inside the turret.

OOC: Velocity does not increase by multiplications, ever. And the larger diameter the round, the slower the velocity. So you need to cut that down, way down.

Why not just invest in several dozen missile batteries rather than an overly expensive giant gun?

Why not just invest in several dozen missile batteries rather than an overly expensive giant gun?

Nuclear Depth Bombs get the job done, as well.

Weight is OK now, though I'd rather specify in tonnes.

Halve the muzzle velocity, keep range the same.

As for cost, well, it's a bit moot point. Naval guns were very expensive, taking up to 20% of ship's cost. Ground-mounted can afford severe cost cuts through use of supports, though.
I'd expect gun alone to be around 50 million (just the steel of proper quality costs upwards of 20 million). Somewhat more with the rest of the system, in 80-100 million range.
That being said, still quite cheap for the effect.


I just made a similar design a while ago, and did a bit of research; might be interesting to take a look at.
http://z4.invisionfree.com/NSDraftroom/index.php?showtopic=183

Why not just invest in several dozen missile batteries rather than an overly expensive giant gun?

Ferrous phallus competitions.

Vault, I made the changes you suggested. Anything else?

Vault, I made the changes you suggested. Anything else?

I like told you on MSN, you should go to NS draftroom first. By posting it on II, it basically means that this is your perfected version ready for sale. Yet apparently, there are still edits needing to be done.

Seems mostly OK by now. Lacks detail somewhat, though.

Armor would be just steel, not steel-reinforced composite.

Seems mostly OK by now.Armor would be just steel, not steel-reinforced composite.


On that note, then, I hereby declare it finished.

Could still use some detail, though.

Also, for the future, the aforementioned NSD is actually quite useful.