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Lardas First Hybrid - HyGaC20

Built a hybrid cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: ALIHISGREAT » Thu Dec 11, 2008 4:11 pm

ramses wrote:I am surprised no one started chanting "lead slugs! Lead slugs!" yet. seriously, this is the 14th page of the possibly the most amazing gun on this site, and no one has demanded lead slugs yet. So I suppose I will.


hmmm... now you've mentioned it :D

+ i want to see the impact recorded with a high speed camera :wink:
(imagine the impact :twisted: )
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Unread postAuthor: starman » Thu Dec 11, 2008 4:25 pm

ramses wrote:I am surprised no one started chanting "lead slugs! Lead slugs!" yet. seriously, this is the 14th page of the possibly the most amazing gun on this site, and no one has demanded lead slugs yet. So I suppose I will.


Well, why all the fuss about lead slugs? He was using these for crying out loud...

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Unread postAuthor: ramses » Thu Dec 11, 2008 4:27 pm

too bad he doesn't live near me; i have the ex-f1. it is flipping awesome. i am probably getting the means to produce some interesting chemicals for Christmas, so go get your ear protection :twisted: too bad I can't talk about it or post the videos on here.
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Unread postAuthor: ALIHISGREAT » Thu Dec 11, 2008 4:39 pm

Lead is different.... it would 'splatter' if you shot it at some steel plate... giving a cool video!
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Unread postAuthor: camosoul77 » Thu Dec 11, 2008 5:25 pm

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Unread postAuthor: Ragnarok » Thu Dec 11, 2008 6:36 pm

camosoul77 wrote:As for politics, .50's have been on the Liberal Chopping Block for a long time. A device such as this could soon be the only way to own such a beast.

You're making the assumption that they won't ever see fit to ban gas powered, rather than powder burning, options.
They've done it in many other countries, even where there are supposedly "laws" preventing such restrictions existing.

We don't have the pressures to necessitate that here.

In terms of average pressure, this is about as good as "spudguns" can get.

A effective average barrel pressure from igniting a mixture near it's precompression limit would be about 3700 psi - approximately a quarter of that of the .50 BMG, which is about 15,000 psi effective average (not peak)
With some adjustments, that pressure could be upped by about 50% by using a Propane/Butane/Air mix in the right proportions, but that's still pretty low in firearm terms.

...Actually, no, I'm mistaken, this is not as good as spudguns get. There is one out there with an average barrel pressure of 6400 psi, and with less limits on bettering it.

@ramses: Although the ex-f1 is impressive, IIRC, it's limited to about 1200 frames per second. You could see a target fly apart pretty well, but there's no way in hell you'll be seeing the projectile in any detail.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: ramses » Thu Dec 11, 2008 7:29 pm

It is limited to 1200 fps, but as far as what we can afford, that is still pretty good. with good lighting, some stills could probably be extracted involving lead splatter.
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Unread postAuthor: camosoul77 » Thu Dec 11, 2008 8:18 pm

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Unread postAuthor: SEAKING9006 » Thu Dec 11, 2008 9:04 pm

I have to interject.

Camosoul, your projection of 'not difficult to get access to' assumes that all of the members of our beloved SpudFiles are of working age and have some sort of qualification. Most of us don't. Hell, I'm only gonna be 17 in two weeks. I can't operate that machinery, let alone find it.
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Completed projects:
CA1 SMSS Basic Inline
CA3 PDAB Airburst Cannon

Current Project: Bolt action rifle (25x140mm + 1in shot)

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Unread postAuthor: Ragnarok » Thu Dec 11, 2008 9:34 pm

ramses wrote:It is limited to 1200 fps, but as far as what we can afford, that is still pretty good. with good lighting, some stills could probably be extracted involving lead splatter.

That would require a fast shutter speed, not a fast frame rate. As far as I know, few things have the right shutter speed for the job, and those that do require huge lighting.

This photo was the work of Pete off the UKSGC:
Image

Needed a 1/10,000th shutter speed, the ball wasn't all that fast, and it's still blurring. Took about 4000W of lighting I think.

@camosoul77: Average effective - not peak, which is a big difference. Peak pressure tells you whether it will blow up, average effective tells you how much muzzle energy you get per unit of barrel volume, so gives you an idea of a power/size ratio.
I was deliberately emphasising that point. Average effective is not usually used in firearms - or anywhere really. To be frank, I'm about the only person that really makes use of it on this forum, mostly to guestimate a combustion's power.

We can work out the average effective quite easily, as it's muzzle energy divided by barrel volume, with a constant to sort out the units (With ft-lbs and cubic inches, multiply the result by 12)
I did make a slight error before, the average effective is 21,000 psi for a 12,000 ft-lb shot from a 45 inch .50 BMG barrel. (The error was incurred by a lazy conversion to metric and back again.)

So it's closer to a sixth - and could probably be boosted to a quarter - of the .50 BMG's average effective pressure.
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Unread postAuthor: camosoul77 » Fri Dec 12, 2008 10:48 am

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Unread postAuthor: CpTn_lAw » Fri Dec 12, 2008 11:59 am

I own a EX-F1 too. The maximum shutter speed is 1/40,000 th of a second, a photo of the sun in direct exposure with this shutter speed is dark.
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Unread postAuthor: starman » Fri Dec 12, 2008 12:15 pm

camosoul77 wrote:As for being 16 years old... I suppose it is a bit of a hurdle, but if I did it, so can you.


Hey I'm 51 and it's somewhat of a hurdle for me, albeit one that I choose to keep in place. Many other priorites dictate financial outlays. If I chose to be a machinist/metalurgist and by extension gunsmith/cannonsmith, I could do so simply by opening the pocketbook. It isn't that kind of priority for me, at least at this time. I know you can buy time at the neighborhood "metal shop". That really doesn't interest me because I like to "fiddle" way too much...

That's why PVC and standard pipe fitting cannons appeal to me and many others.
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Unread postAuthor: camosoul77 » Sat Dec 13, 2008 4:14 pm

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Unread postAuthor: starman » Sat Dec 13, 2008 4:33 pm

camosoul77 wrote:I' just trying to, in a tough love kind of way, inspire those who would like to step it up a notch.


How about just leave all that love stuff out and just inspire us with a cannon creation of your own. You never know, it might make me change my mind... :wink:
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