Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 55 users online :: 5 registered, 0 hidden and 50 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Behemoth, from 2006 (Image heavy)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Behemoth, from 2006 (Image heavy)

Unread postAuthor: Ragnarok » Fri Oct 16, 2009 6:21 pm

Firstly, what is Behemoth, and why is it only being posted now?

As for the what, I'm sure most of you are familiar with HEAL.
Behemoth was HEAL's predecessor (up to the point that HEAL was known as Behemoth 2 in the early stages of the design), built in October 2006.

As for the why, I've come across an old backup of files from a couple of years ago that actually has pictures of Behemoth in it. Up until now, I'd lost most of the records of Behemoth.

There were four revisions of Behemoth. The one you're probably most familiar with is Behemoth V1.0, one of the few photos I still had around before I found the backup:

Image

At 190cm total length, and 7 kilos in weight, the name was not inappropriate. It was the largest thing I'd ever built.

It was also somewhat inefficient for its size - the barrel was only a metre long (so only just over half the total length), and although it had a 20mm piston valve, it only used 10 bar.

That said, with 3 litres of fire extinguisher to refill from, it could fire pretty fast with prepared ammo on hand. It was unregulated, so obviously, pressure dropped with each shot - still, it would fire about 10-12 shots before the pressure was too low for it to work.

You can see the crude system used to stop the heavy tank distorting the launcher here (electrical tape for the win!)
Image

~~~~~

Behemoth V1.1 took off the extinguisher - although fun, it was too heavy to be practical.

Image

I did add a "bayonet" twist lock muzzle attachment system though, and some porting to go with it (which did help accuracy somewhat - but results did improve dramatically when I used larger holes in the porting)

Image
Image
Image

~~~~~

Behemoth V1.2 was a power upgrade - an extra half metre of barrel, and a pressure increase (Pressures of 160-200 psi were common). This brought its length back up to a little more than that of v1.0, but the 50-70% power upgrade was worth it.

Image

I also upgraded the pilot, building a smaller piston valve for the job:
Image
Image

Also, the breech:
Image

~~~~~

Behemoth v1.2.5 was pretty much the same as Behemoth v1.2, except the pilot area was soldered to get me back into practise for building HEAL:
Image

~~~~~

Okay, the obligatory "damage pics" - and based on the picture numbering, these were done with Behemoth V1.2

Here we have a DVD player casing. 1mm thick steel on both sides.
Image

A crapload of pumping, loading and shooting later:
Image
Image

My notes tell me that the X is where a paintball hit, but with no real mark; 1 was potato; 2 was a frozen grape; 3 was blu-tac (which, as it's dilatant, can be impressive at high speeds); 4 was a bit of threaded rod with nuts and washers; 5 and 6 were steel ball bearings; 7 was frozen potato; and 8 was a marble.

The threaded rod was interesting because of the imprint it left on the other side.

Image

Yeah, no penetration through (although some close attempts, but at the time, the breach wasn't sealing very well. One new O-ring later, and I had two holes through the first layer to show for the efforts. (Sorry, I have no record of what all the other added dents are... at a guess, mostly potato & paintballs - the top left looks like an AA battery though.)

Image
Image

Still, pretty dull for a cannon of the size. 1mm steel isn't all that tough.

What about a sub-calibre projectile and 2mm steel...?

Image
Image
Image

Better. Another target was a Quality Street tin with a 3/4" steel ball - quite thin steel, but it was full of water at the time.

Image

The lid did fly about 15 feet up in the air from hydraulic shock though.

Also, a couple of drinks cans it took apart with potato slugs:
Image
Image

~~~~~

It's an old cannon, but one I figured I'd share anyway.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: urgle the danish cow » Sat Oct 17, 2009 6:03 am

wow. completely amazing. with that barrel what kind of range do you get? :shock: im having trouble myself finding a piece for the back of the barrel to get sealed bt the piston.
  • 0

User avatar
urgle the danish cow
Sergeant Major
Sergeant Major
 
Posts: 176
Joined: Sun Jul 26, 2009 4:48 pm
Reputation: 0

Unread postAuthor: inonickname » Sat Oct 17, 2009 8:09 am

Good lord there is a fair number of fittings there.

Urgle this gun is old. 3 Years old. He's moved on to bigger and better things..though it's still nice to see what people have done in the past.

How would you compare it's power to heal (and heal 2 eventually)? In terms of muzzle energy, velocity, accuracy, or whatever measure you choose to use?
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: Ragnarok » Sat Oct 17, 2009 2:28 pm

urgle the danish cow wrote:wow. completely amazing. with that barrel what kind of range do you get?

I don't really quantify my cannons by their range. However, there was one test I did which put a 3/4" steel ball bearing somewhat over a quarter mile.

Thanks for the compliment, but... well, it's not all that amazing. It had some potential, but it wasn't very well achieved.
With more pressure, a better breech, and using neater soldered fittings it could have been quite a bit more... and indeed, that's exactly what HEAL was - taking Behemoth's design and swapping out the bad bits.

inonickname wrote:How would you compare its power to heal (and heal 2 eventually)? In terms of muzzle energy, velocity, accuracy, or whatever measure you choose to use?

Well, despite the fact it was somewhat larger than HEAL, HEAL's higher pressure and more efficient valve puts muzzle energy about 50-70% higher than even the most powerful version of Behemoth.

HEAL 2 will be about 50% more energetic again compared to HEAL, so that would make HEAL 2 anywhere from about 2 to 2.5 times the power of Behemoth.

This gun is old. 3 Years old. He's moved on to bigger and better things.

You should bear in mind that even HEAL is about two and a half years old... It's yonks since I've actually finished a "new" cannon, as opposed to tinkering with modifications to older ones.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: jackssmirkingrevenge » Sat Oct 17, 2009 6:19 pm

  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: velocity3x » Sat Oct 17, 2009 7:16 pm

Ragnarok wrote:HEAL 2 will be about 50% more energetic again compared to HEAL, so that would make HEAL 2 anywhere from about 2 to 2.5 times the power of Behemoth.


HUH???? For those of us that are algebraically challenged and unfamiliar with your previous models and variants, could you please state your estimates of power in terms of muzzle energy and velocity? :P
  • 0

User avatar
velocity3x
Brigadier General
Brigadier General
 
Posts: 827
Joined: Fri Jun 05, 2009 3:09 pm
Location: Yuma, Arizona
Country: United States (us)
Reputation: 7

Unread postAuthor: Ragnarok » Sun Oct 18, 2009 2:06 pm

velocity3x wrote:For those of us that are algebraically challenged and unfamiliar with your previous models and variants, could you please state your estimates of power in terms of muzzle energy and velocity?

Firstly, if you're not familiar with it, HEAL. HEAL 2 is still in construction (and likely will remain so for some time, to finish it will demand funds I can't really spare right now - I'm considering just doing enough to get it working as a "HEAL Plus", then finishing the project later when money is available).

I don't tend to compare cannons by just any muzzle velocity, because it's entirely dependent on projectile mass and I use so many different projectiles.

So these days, I figure out two specific numbers to compare a cannon's "power":
1) the mass it will fire at 200 m/s.
2) the velocity at which it fires a full calibre lead sphere (or more commonly, a projectile of equivalent mass). For this barrel, that's 49.6 grams.

There's no particular reason it's those figures, other than they're respectable arbitrary measures that most reasonable cannons can achieve, and give a decent idea of the cannon's performance both at higher velocities, and higher projectile masses.
It also helps take the differences that varying velocity/mass can cause out of the equation.

The various figures are below. All HEAL 2 figures are estimated.

For the fixed velocity:
- Behemoth V1.0: ~ 6 grams
- Behemoth V1.2: ~ 10.5 grams
- HEAL: ~ 18.5 grams
- HEAL 2: ~32 grams

(As a rough rule, a projectile of half this mass will get fired in the region of 250m/s from a pneumatic, so will have about 75-80% of the energy)

For the fixed mass:
- Behemoth V1.0: 85 m/s
- Behemoth V1.2: 108 m/s
- HEAL: 135 m/s
- HEAL 2: ~170 m/s

Both of these can be turned into energy figures, which gives a decent idea of the range which the cannon's energy falls in, be it at high velocity, or high projectile mass.

For the fixed velocity:
- Behemoth V1.0: ~ 120 Joules
- Behemoth v1.2: ~210 Joules
- HEAL: ~370 Joules
- HEAL 2: ~640 Joules

For the fixed mass:
- Behemoth V1.0: ~ 180 Joules
- Behemoth v1.2: ~290 Joules
- HEAL: ~450 Joules
- HEAL 2: ~720 Joules

Anyway, as you can see, the differences in the launchers' performance vary depending on which of the tests it is. While HEAL is ~56% more powerful on the fixed mass test than Behemoth V1.2, it's ~76% more powerful on the fixed velocity test.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Sponsored

Sponsor
 


Unread postAuthor: cannonmaster » Sun Nov 08, 2009 6:52 pm

awesom gun's i think you did the right thing by takeing the tank off and what do you use to pump it with [quote]A crapload of pumping, loading and shooting later
(I figured it was a bike pump since i use it for my gun)
  • 0


cannonmaster
Private
Private
 
Posts: 13
Joined: Tue Aug 11, 2009 4:07 pm
Reputation: 0

Unread postAuthor: Ragnarok » Sun Nov 08, 2009 7:07 pm

cannonmaster wrote:what do you use to pump it with?

Not much really, as it's long since been taken to pieces...

...but yes, at the time, I was using a bike pump.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: cannonmaster » Sun Nov 08, 2009 7:11 pm

ok thank's i was just wondering
  • 0


cannonmaster
Private
Private
 
Posts: 13
Joined: Tue Aug 11, 2009 4:07 pm
Reputation: 0

Return to Pneumatic Cannon Database

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'