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Post by 𝕭𝖔𝖔𝖒𝖈𝖍𝖆𝖈𝖑𝖊 on Dec 1, 2017 8:31:32 GMT
This is the best I could do without knowing the length of your missile. This is near the peak power you can use for this type of railgun without suffering an incredible loss to efficiency. thats actually pretty good
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Post by 𝕭𝖔𝖔𝖒𝖈𝖍𝖆𝖈𝖑𝖊 on Dec 1, 2017 8:32:24 GMT
I am trying to build a rail gun to throw a payload of 18.8kg with a bore diameter of 18.4cm but I am frankly getting nowhere. Coil Guns don't seem to work almost at all. I'm wondering if anyone else has had any luck with gun launched payloads and may be able to shed some light on my problems. Many thanks. J 19 kilograms, you say? A blast launcher could fire that at 4 kilometers per second with a thousand rounds per minute
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Post by ironclad6 on Dec 1, 2017 9:15:39 GMT
Yeah, that is what I am using right now.
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Post by jtyotjotjipaefvj on Dec 1, 2017 9:45:41 GMT
Here's the bigger gun I ended up using in the conventional guns challenge: 8.5 kg round, 2.3 km/s launch velocity and 3 rounds per second with a 177 kc gun. It's pretty decent.
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Post by ironclad6 on Dec 1, 2017 15:29:18 GMT
I found using a second stage booster worked better and gave up.
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Post by 𝕭𝖔𝖔𝖒𝖈𝖍𝖆𝖈𝖑𝖊 on Dec 2, 2017 7:02:17 GMT
Here's the bigger gun I ended up using in the conventional guns challenge: 8.5 kg round, 2.3 km/s launch velocity and 3 rounds per second with a 177 kc gun. It's pretty decent. thats quite a light projectile I didnt see the frag. this looks pretty cool but even conventional ciws might shoot the frags down
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Post by gfarrell80 on Dec 30, 2017 16:24:31 GMT
Yeah, the absurd barrel acceleration is one reason why I prefer to launch only simple, solid material payloads out of guns/coilguns/railguns. anything with thin-walled fuel tanks and complex moving parts like rocket motors probably isn't going to do well.
What would be a good g limit to work with? Projectiles can have some complexity to them - HE shells survive the acceleration of conventional guns, you could probably launch a shell that has a simple rocket booster on it that would survive some pretty high g's. But a complex KKV with fuel tanks and a guidance system going from zero to over 1 k/s over the distance of a few meters sounds like trouble.
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Post by samchiu2000 on Dec 31, 2017 17:17:23 GMT
Yeah, the absurd barrel acceleration is one reason why I prefer to launch only simple, solid material payloads out of guns/coilguns/railguns. anything with thin-walled fuel tanks and complex moving parts like rocket motors probably isn't going to do well. What would be a good g limit to work with? Projectiles can have some complexity to them - HE shells survive the acceleration of conventional guns, you could probably launch a shell that has a simple rocket booster on it that would survive some pretty high g's. But a complex KKV with fuel tanks and a guidance system going from zero to over 1 k/s over the distance of a few meters sounds like trouble. Maybe we can set 60,000 gee as a upper limit of realistic missile acceleration, given that it is about the highest possible acceleration of a guided projectile today, which is fired from a railgun.
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Post by gfarrell80 on Jan 1, 2018 15:31:33 GMT
Yeah, the absurd barrel acceleration is one reason why I prefer to launch only simple, solid material payloads out of guns/coilguns/railguns. anything with thin-walled fuel tanks and complex moving parts like rocket motors probably isn't going to do well. What would be a good g limit to work with? Projectiles can have some complexity to them - HE shells survive the acceleration of conventional guns, you could probably launch a shell that has a simple rocket booster on it that would survive some pretty high g's. But a complex KKV with fuel tanks and a guidance system going from zero to over 1 k/s over the distance of a few meters sounds like trouble. Maybe we can set 60,000 gee as a upper limit of realistic missile acceleration, given that it is about the highest possible acceleration of a guided projectile today, which is fired from a railgun. Railguns aren't firing complex devices with tanks, propellant, and guidance systems, they're firing a simple hunk of metal. 60,000 sounds pretty high for missile components. The g's a guidance package is supposed to endure are between 20,000 to 40,000 per wikipedia (https://en.wikipedia.org/wiki/Railgun). Although, the guidance package they are talking about is I believe an aerodynamic fin/drag type guidance system on a solid metal projectile, not a missile with thrusters and propellent and some kind of warhead.
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Post by Enderminion on Jan 1, 2018 15:58:40 GMT
you would get a "water" hammer type affect in propellant tanks, blow out the tail end of the tank.
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Post by treptoplax on Jan 3, 2018 3:11:15 GMT
Yeah, the absurd barrel acceleration is one reason why I prefer to launch only simple, solid material payloads out of guns/coilguns/railguns. anything with thin-walled fuel tanks and complex moving parts like rocket motors probably isn't going to do well. What would be a good g limit to work with? Projectiles can have some complexity to them - HE shells survive the acceleration of conventional guns, you could probably launch a shell that has a simple rocket booster on it that would survive some pretty high g's. But a complex KKV with fuel tanks and a guidance system going from zero to over 1 k/s over the distance of a few meters sounds like trouble. Hmmm. Artillery-launched nukes have been demonstrated, and those are pretty sophisticated hardware... Probably only talking about a few hundred meters per second there, though.
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Post by tangentialthreat on Jan 3, 2018 4:29:24 GMT
One of the things we're missing is solid rocket motors, which would be a bit more plausible for surviving high acceleration.
Given the single-digit ballistic efficiency of most guns and the limitations of railguns I'm not convinced that firing a missile out of a gun is ever actually a good idea. The energy from missile delta v is usually higher than the energy from launch, and sometimes firing all missiles at once is much better than one at a time. I built gyrojet missiles anyway in CDE because it was cool. I have a private conspiracy that the military also approves and maintains certain weapons solely because they're cool and not because they're efficient.
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Post by Hicks on Jan 18, 2018 6:41:59 GMT
If that was the case, the Iowa would be an active vessel instead of mothballed.
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Post by ravingmaniac on Jan 19, 2018 11:47:20 GMT
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Post by 𝕭𝖔𝖔𝖒𝖈𝖍𝖆𝖈𝖑𝖊 on Jan 20, 2018 21:23:29 GMT
beautiful gun and ammo, however, it will possibly be impractical due to laser defenses
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