carbon5985
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Post by carbon5985 on Dec 2, 2017 5:59:59 GMT
But i dont want to shoot zinc CD discs Is there any other option rather than increasing the bore radius? (Also i cant use tnt due to high pressures)
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Post by The Astronomer on Dec 2, 2017 6:17:35 GMT
But i dont want to shoot zinc CD discs Is there any other option rather than increasing the bore radius? (Also i cant use tnt due to high pressures) No. You need to shoot disks. That, or increase bullet mass so it won't be a disk but a proper block.
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carbon5985
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Post by carbon5985 on Dec 2, 2017 8:47:10 GMT
So there is no reason to use bore radius lesser than 10mm? ;_;
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Post by Kerr on Dec 2, 2017 8:51:08 GMT
So there is no reason to use bore radius lesser than 10mm? ;_; Apparently not
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Post by jtyotjotjipaefvj on Dec 2, 2017 12:03:51 GMT
Wider projectiles are better mainly due to the game lacking the ability to have a wider chamber than barrel. Since you generally want to have a lot of propellant compared to your projectile volume, you'll have to waste a lot of barrel length for just storing the propellant. When shooting CD discs this is less of an issue: you still have a lot more barrel length used by propellant than the projectile, but since the projectile is so thin it doesn't matter as much. Another issue is that a thin, long bunch of projectile burns longer than a short, wide one, which means that for the same load you need a far longer barrel and are affected more by beam deflection stress, meaning your barrel has to be stronger too. It still doesn't mean you can't have guns that fire non-disc projectiles, you're just limited to lower muzzle velocities or ridiculously heavy barrels if you want to go higher. Below is a comparison between wide and long projectiles with an identical propellant load. The wider projectile cannon is 3 times lighter, the barrel is far more aesthetic, and it gets a higher muzzle velocity. When it comes to propellants, the differences are fairly minor. It's mostly a tradeoff between mass and cost of the propellant, although with Octogen and Cyclogen you can get a bit higher muzzle velocities than the cheaper ones. I mainly use either Octogen for a lighter, high-performing propellant, or Nitrocellulose if I need a dirt-cheap option where performance and mass are not that important. Since TNT and Nitrocellulose put out less energy per kg but are cheaper, they'll be far cheaper to use than the better propellants, but you'll usually also need a heavier barrel due to their slower burn rate. Propellant choice also affects how your breech pressure behaves. Octogen and Cyclogen burn far faster than the cheap propellants, which means that you'll need a stronger barrel but since pressure tapers off more quickly, your barrel can be shorter. VCS is usually a good barrel material for these propellants, since it has the best strength vs mass and cost if you need a short barrel. With VCS your barrel is also usually quite thin, which means it looks nicer. With the slower-burning TNT and Nitrocellulose, your pressure curve won't peak so high but it also takes longer to taper off. You'll usually want a longer but softer barrel here, which means you'll want something lighter than VCS. Good choices here are Amorphous Carbon, or perhaps Titanium if you think carbon-based barrels are questionable. The weaker material will be a lot cheaper than a similar VCS barrel but you'll lose out some credits to your turret momentum wheels, since the longer barrel will have more moment of inertia to overcome. Below is a comparison between the different propellants with an identical barrel and projectile. You can get very similar performance out of all four, but note how the pressure curve as well as mass and cost of the full cannon+ammo assembly changes.
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Post by The Astronomer on Dec 2, 2017 13:07:41 GMT
Qswitch mentioned that long, thin projectiles (needles) are more likely to shatter upon contact with the whipple shield than short, wide projectiles (disks).
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Post by bigbombr on Dec 2, 2017 16:16:01 GMT
Qswitch mentioned that long, thin projectiles (needles) are more likely to shatter upon contact with the whipple shield than short, wide projectiles (disks). Pretty sure it was the inverse.
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carbon5985
New Member
:D Chemistry is Love Organic is Bae
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Post by carbon5985 on Dec 2, 2017 18:05:06 GMT
quick update i got it to have better cost apprently using the armor to have high yeild strength and use diamond on the barrel works great even though boron got nerfed to boron filament but boron is still the best ( no other material can beat borons cost-yeuld strength) ok sorry but i just want 1mm bore radius : P
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Post by Enderminion on Dec 2, 2017 20:16:38 GMT
aerogel is better for stiffining and diamond is better for heat issues
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Post by The Astronomer on Dec 3, 2017 0:11:22 GMT
Qswitch mentioned that long, thin projectiles (needles) are more likely to shatter upon contact with the whipple shield than short, wide projectiles (disks). Pretty sure it was the inverse. Oh, you're right!"One is that Whipple Shields shatter thinner projectiles easier. Whipple Shields are often judged primarily by their critical diameter. This is the maximum diameter of projectile that they can be hit with and still successfully shatter or vaporize the projectile so that it causes no major damage. Obviously, material properties and impact velocity are both important, but projectile diameter is the main factor. Thus, thin penetrators are often not really worth the extra damage since Whipple Shields are ubiquitous." - Qswitch
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carbon5985
New Member
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Post by carbon5985 on Dec 3, 2017 8:22:42 GMT
aerogel is better for stiffining and diamond is better for heat issues But diamond has higher young's modulus than the aerogel which makes the diamond a better chooce for stiffining?
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carbon5985
New Member
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Post by carbon5985 on Dec 3, 2017 8:24:56 GMT
Pretty sure it was the inverse. Oh, you're right!"One is that Whipple Shields shatter thinner projectiles easier. Whipple Shields are often judged primarily by their critical diameter. This is the maximum diameter of projectile that they can be hit with and still successfully shatter or vaporize the projectile so that it causes no major damage. Obviously, material properties and impact velocity are both important, but projectile diameter is the main factor. Thus, thin penetrators are often not really worth the extra damage since Whipple Shields are ubiquitous." - Qswitch Is it possible to use osmiumrod as payload and other light material for the projectile to have wide bore radius and smaller projectile diameter at the same time? Kinda like apds/apcr rpunds irl
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Post by The Astronomer on Dec 3, 2017 8:47:34 GMT
Oh, you're right!"One is that Whipple Shields shatter thinner projectiles easier. Whipple Shields are often judged primarily by their critical diameter. This is the maximum diameter of projectile that they can be hit with and still successfully shatter or vaporize the projectile so that it causes no major damage. Obviously, material properties and impact velocity are both important, but projectile diameter is the main factor. Thus, thin penetrators are often not really worth the extra damage since Whipple Shields are ubiquitous." - Qswitch Is it possible to use osmiumrod as payload and other light material for the projectile to have wide bore radius and smaller projectile diameter at the same time? Kinda like apds/apcr rpunds irl Yes. Just that less pressure equals less acceleration and that’s wasteful.
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Post by jtyotjotjipaefvj on Dec 3, 2017 9:08:04 GMT
Is it possible to use osmiumrod as payload and other light material for the projectile to have wide bore radius and smaller projectile diameter at the same time? Kinda like apds/apcr rpunds irl Yes. Just that less pressure equals less acceleration and that’s wasteful. The mechanics are not quite that simple. Increasing bore radius decreases pressure, but not necessarily acceleration, since pressure difference is equal to force per area, not just force. With a larger bore you can get higher accelerations for your projectile with less pressure load, which basically means that you can get a higher muzzle velocity without ridiculous amounts of steel on your barrel. As an example, here's a gun that fires 1 kg slugs at 10 rounds per second, with a muzzle velocity of 2.8 km/s. The only reason it's not my mainstay gun is that the payloads cause disgusting amounts of lag compared to bullets, and they sometimes just phase through ships they're supposed to hit.
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Post by Enderminion on Dec 3, 2017 17:52:39 GMT
aerogel is better for stiffining and diamond is better for heat issues But diamond has higher young's modulus than the aerogel which makes the diamond a better chooce for stiffining? Graphite Aerogel is super not dense which allows you to have more of it and still have it be lighter (and cheaper) then diamond
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