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Old 04-27-2012, 04:33 PM   #1791896  /  #26
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I don't think that was ever a realistic goal. Engineers aren't dumb. Plus, there's no need for it. You don't need a projectile to travel at light speed.
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Old 04-27-2012, 04:37 PM   #1791901  /  #27
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but holy shit. think of the physics you could do!
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Old 04-27-2012, 04:44 PM   #1791913  /  #28
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Aeons ago, in my 3rd year physics lab, two of my classmates rigged up a basic railgun using a big electromagnet and a bunch of car batteries. They came up with a pretty clever way of measuring the speed of the projectile, too.

It occurred to me that seeing yadda yadda number of metres per second for a projectile of yadda yadda grams was all very well and good, but I wanted to know what it felt like to be hit by one.

So I persuaded them to fire it at my chest, with me sitting just a few metres away.

Kinda stupid of me, arguably.
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Old 04-27-2012, 04:46 PM   #1791917  /  #29
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arguably? Did you already know it would work?
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Old 04-27-2012, 04:49 PM   #1791925  /  #30
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i was about to post videos of u.s. navy railgun tests from years ago but then i realized that i didn't care enough
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Old 04-27-2012, 04:52 PM   #1791928  /  #31
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Quote:
Originally Posted by Brother Daniel View Post
Aeons ago, in my 3rd year physics lab, two of my classmates rigged up a basic railgun using a big electromagnet and a bunch of car batteries. They came up with a pretty clever way of measuring the speed of the projectile, too.

It occurred to me that seeing yadda yadda number of metres per second for a projectile of yadda yadda grams was all very well and good, but I wanted to know what it felt like to be hit by one.

So I persuaded them to fire it at my chest, with me sitting just a few metres away.

Kinda stupid of me, arguably.
Did you survive it?
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Old 04-27-2012, 04:52 PM   #1791929  /  #32
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At first all this railgun talk made me wanna find my old Doom game and play it. But then I realized that makes me really old so I didn't bother.
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Old 04-27-2012, 04:54 PM   #1791933  /  #33
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even pong doesn't make you really old you son of a bitch.
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Old 04-27-2012, 04:58 PM   #1791937  /  #34
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arguably? Did you already know it would work?
Yeah, I had already seen a projectile beastie slam into the opposite wall of the lab. Didn't really leave much of a mark on the wall, though.

For my test, I put on a heavy winter coat to use as armour.

Someone with a baseball and a decent throwing arm could have hurt me more, quite easily.
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Old 04-27-2012, 04:59 PM   #1791939  /  #35
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i was about to post videos of u.s. navy railgun tests from years ago but then i realized that i didn't care enough
But you cared enough to make this post.
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Old 04-27-2012, 05:00 PM   #1791940  /  #36
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even pong doesn't make you really old you son of a bitch.
Pong. Those were the days!
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Old 04-27-2012, 05:10 PM   #1791948  /  #37
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I bought a pong game in the 70's. I probably still have it.
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Old 04-27-2012, 05:10 PM   #1791949  /  #38
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Quote:
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I don't think that was ever a realistic goal. Engineers aren't dumb. Plus, there's no need for it. You don't need a projectile to travel at light speed.
what if it were a very large projectile, and you could fit people inside.

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Old 04-27-2012, 05:12 PM   #1791951  /  #39
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that would be like a g force test, right? Like how many G's does it take to break down organic compounds?
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Old 04-27-2012, 05:40 PM   #1791977  /  #40
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I'm p.sure if you stood inside the toroid of the tokamak reactor you could accelerate pretty close to light speed with minimal g-force
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Old 04-27-2012, 05:41 PM   #1791978  /  #41
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Quote:
Originally Posted by TySixtus View Post
Quote:
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i was about to post videos of u.s. navy railgun tests from years ago but then i realized that i didn't care enough
But you cared enough to make this post.
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Old 04-27-2012, 06:21 PM   #1792001  /  #42
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Quote:
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Well the concepts behind rail guns are fairly well known. Everyone who cares is already aware of the general design limitations, weapon capabilities, etc. It's all in the execution, obviously.

BAE has said a few things:

1) They've reached the Navy's projectile speed requirement, though they haven't said exactly what that requirement is. However, the Navy has publicly said they want between 4,800 and 5,600 mph. So I assume they're in that range.

2) The projectile that they're using in the video is deliberately non-aerodynamic, to keep it from going too far and to aid in projectile retrieval.

3) The gun will practically require a nuclear power source. I don't know what this means for the Navy, since they have no ships on the drawing board to use nuke power besides carriers. The last nuclear cruisers were the California class, and they are all decommissioned.
I was wondering about point 3. I guess the next question would be: What's currently the smallest vessel we could fit with this technology and a nuclear reactor? Destroyer, light cruiser?
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Old 04-27-2012, 06:40 PM   #1792015  /  #43
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small portable nuclear power source?

see also DARPA project: Wikipedia reference-linkPolywell
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Old 04-27-2012, 06:53 PM   #1792027  /  #44
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Destroyer, light cruiser?
Technically there were never any destroyers or light cruisers that were nuke powered. The only nuke ships besides carriers and subs were guided missile cruisers, of which the California class was the last. They were decommissioned in 1999.

So as far as I know, there are no platforms to put this weapon on yet, if they must have nuclear power. In fact, I would guess that the tremendous power requirements of this weapon will necessitate a new ship class, because you'll have to design the reactor and the weapon's cooling systems from the keel up. They are likely going to be extensive.
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Old 04-27-2012, 07:14 PM   #1792041  /  #45
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Destroyer, light cruiser?
Technically there were never any destroyers or light cruisers that were nuke powered. The only nuke ships besides carriers and subs were guided missile cruisers, of which the California class was the last. They were decommissioned in 1999.

So as far as I know, there are no platforms to put this weapon on yet, if they must have nuclear power. In fact, I would guess that the tremendous power requirements of this weapon will necessitate a new ship class, because you'll have to design the reactor and the weapon's cooling systems from the keel up. They are likely going to be extensive.
It wouldn't be a boat, it'd be a floating power source and weapon.
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Old 04-27-2012, 07:15 PM   #1792042  /  #46
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Quote:
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Destroyer, light cruiser?
Technically there were never any destroyers or light cruisers that were nuke powered. The only nuke ships besides carriers and subs were guided missile cruisers, of which the California class was the last. They were decommissioned in 1999.

So as far as I know, there are no platforms to put this weapon on yet, if they must have nuclear power. In fact, I would guess that the tremendous power requirements of this weapon will necessitate a new ship class, because you'll have to design the reactor and the weapon's cooling systems from the keel up. They are likely going to be extensive.
It wouldn't be a boat, it'd be a floating power source and weapon.
Not much difference in design philosophy to the A-10 Warthog.
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Old 04-27-2012, 07:27 PM   #1792044  /  #47
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I saw one of those at a museum in Hartford, CT I think. Man, that's a massive gun and ammo assembly.
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Old 04-27-2012, 09:40 PM   #1792130  /  #48
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speaking of giant mobilized power supplies, I sort of know the guy who designed this bug factory:

https://www.google.ca/search?um=1&hl....0.kn6Yvbzftzw
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Old 04-28-2012, 02:24 PM   #1792595  /  #49
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sanshou.

Wrong on railguns.

Wrong for talkrational.

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what's the bart roberts equivalent of "hope" and "change"?
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