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 44 users online :: 3 registered, 0 hidden and 41 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

The Team
Administrators
Global Moderators
global_moderators.png CS

real mortar

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

real mortar

Unread postAuthor: quiggly17 » Tue Aug 28, 2007 1:28 pm

here is a new idea for a mortar the ammo has a pin on it that rupshures the burst disc and cause all the air to come through

<a href="http://photobucket.com" target="_blank"><img src="http://i234.photobucket.com/albums/ee226/quiggly17/mortar.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>
  • 0


quiggly17
Specialist
Specialist
 
Posts: 45
Joined: Sun Aug 12, 2007 10:10 am
Reputation: 0

Unread postAuthor: potatoflinger » Tue Aug 28, 2007 2:05 pm

I thought of something similar to this, except I never built it because for some reason I don't like the idea of a projectile flying in close proximity to my arm, but I think that the idea would work, you should try it (just be extra careful when you shoot it).

Edit: If you do make one, make the barrel really long so that you have time to move your hand out of the way, and to give the projectile enough time to accelerate enough to pierce the burst disc.
  • 0

Last edited by potatoflinger on Tue Aug 28, 2007 4:15 pm, edited 1 time in total.
It's hard to soar with eagles when you're working with turkeys.
User avatar
potatoflinger
Brigadier General
Brigadier General
 
Posts: 1136
Joined: Thu Nov 02, 2006 3:26 pm
Location: Maryland
Reputation: 1

Unread postAuthor: mega_swordman » Tue Aug 28, 2007 2:20 pm

it could work in theory, but I agree with potatoflinger. Unless you can make the projectile slide down slower, it would be potentially dangerous.
  • 0

"Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity." George S. Patton
User avatar
mega_swordman
Colonel
Colonel
 
Posts: 527
Joined: Wed Nov 29, 2006 2:37 pm
Location: Bay Area, California
Reputation: 0

Unread postAuthor: BC Pneumatics » Tue Aug 28, 2007 2:23 pm

Hardly revolutionary.
  • 0

<a href="http://www.bcarms.com/"><img src="http://www.bcarms.com/images/store_logo.png" border="0"> </a>
User avatar
BC Pneumatics
Donating Member
Donating Member
 
Posts: 1089
Joined: Tue Jan 18, 2005 6:55 pm
Location: Fresno, CA
Reputation: 0

Unread postAuthor: paaiyan » Tue Aug 28, 2007 2:33 pm

Would be better if there was a camlock system so you could change the burst discs faster.
  • 0

"Who ever said the pen was mightier than the sword, obviously, never encountered automatic weapons."
-General Douglass MacArthur

Read my dog's blog - Life of Kilo
User avatar
paaiyan
Major General
Major General
 
Posts: 2140
Joined: Wed Dec 27, 2006 10:03 pm
Location: Central Oklahoma
Country: United States (us)
Reputation: 1

Unread postAuthor: aetherguy881 » Tue Aug 28, 2007 2:48 pm

It also depends on the seal around the projectile in the barrel. If it's relatively close to the id, then it will travel down the barrel slower than if it were say .25" smaller than the barrel.

It's not like you need to throw it into the barrel, just drop and move at the same time. Personally I haven't seen what the problem with mortars is. I'm referring to the launch so close to the arm, etc.
  • 0


aetherguy881
Private First Class
Private First Class
 
Posts: 32
Joined: Sun Jan 16, 2005 8:41 pm
Location: Somewhere in CT
Reputation: 0

Unread postAuthor: paaiyan » Tue Aug 28, 2007 2:53 pm

aetherguy881 wrote:It also depends on the seal around the projectile in the barrel. If it's relatively close to the id, then it will travel down the barrel slower than if it were say .25" smaller than the barrel.

It's not like you need to throw it into the barrel, just drop and move at the same time. Personally I haven't seen what the problem with mortars is. I'm referring to the launch so close to the arm, etc.


The problem, as with most things in life, is stupid people. The kind of peope that say "hey guys, watch this" only to never be heard from again. I can guarantee, there are people out there who would drop it in with their hand over the barrel, or their face for that matter. Making sure the mortal takes a couple seconds to launch helps minimize the chances of stupidity causing any sort of damage.
  • 0

"Who ever said the pen was mightier than the sword, obviously, never encountered automatic weapons."
-General Douglass MacArthur

Read my dog's blog - Life of Kilo
User avatar
paaiyan
Major General
Major General
 
Posts: 2140
Joined: Wed Dec 27, 2006 10:03 pm
Location: Central Oklahoma
Country: United States (us)
Reputation: 1

Sponsored

Sponsor
 


Unread postAuthor: DYI » Tue Aug 28, 2007 4:27 pm

"If you make something idiot-proof, they will build a better idiot."

The kind of person who would stick their hand in front of this shouldn't be allowed anywhere near it. These things are inherently dangerous, and it is always up to the operator to use them safely.

The projectile has to build up enough momentum to break the burst disk holding over 100 psi. I have played around with a mortar idea on one of my small caliber burst disk guns, and it is pretty entertaining. A better idea than a projectile with a point is a sabot of sorts, that is placed behind the projectile, and is designed so that it only travels a short distance out the barrel. For this, a flat plate made out of lead or steel would work well, as long as it has a very sharp point on the back.

The idea has been thought of many times before, and some people have actually built them on a small scale.
  • 0

User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Unread postAuthor: potatoflinger » Tue Aug 28, 2007 4:48 pm

Either way, you have to have your hand near the end of the barrel (for a realistic mortar). You just have to take as many precautions as possible and use your head.
  • 0

It's hard to soar with eagles when you're working with turkeys.
User avatar
potatoflinger
Brigadier General
Brigadier General
 
Posts: 1136
Joined: Thu Nov 02, 2006 3:26 pm
Location: Maryland
Reputation: 1

Unread postAuthor: thespeedycicada » Tue Aug 28, 2007 5:03 pm

i think ive senn this done before but im not sure where i saw it.
  • 0

User avatar
thespeedycicada
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 429
Joined: Sun Aug 12, 2007 1:28 am
Reputation: 0

Unread postAuthor: noname » Tue Aug 28, 2007 10:36 pm

I made a gun using this exact concept, and it works extremely well, performance wise. It's usually hard to pop a good burst disc that can hold a lot of pressure. You need a 3+ foot barrel to get it going fast enough to pop the disc, or it has to be at least 95% vertical.
  • 0

User avatar
noname
Lieutenant General
Lieutenant General
 
Posts: 2699
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA
Country: United States (us)
Reputation: 9

Unread postAuthor: pyromanic13 » Tue Aug 28, 2007 10:39 pm

wouldn't it be easier to use a sprinkler valve with a micro-switch located near the bottom?

or maby a metal disk that seals against the barrel held on by pressure.
  • 0

Movie dialogue: "The good die first."
Tom: "But most of us are morally ambiguous, which explains our random dying
patterns."

pyromanic13
Brigadier General
Brigadier General
 
Posts: 913
Joined: Wed Oct 19, 2005 7:54 pm
Reputation: 0

Unread postAuthor: hi » Wed Aug 29, 2007 12:14 am

maybe you could use one of those things that janitors use to pick up trash to drop the projuectile.

its funny, i had this same design concept at football practice today..... dont ask why because i really dont know, it just sorta poped in my head.
  • 0

"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
User avatar
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: Rock » Wed Aug 29, 2007 4:07 am

I did exactly what he described by accident.
My hybrid launcher was prepared to fire. I dropped in a piece of wood i wanted to shoot, it penetrated the burst disc and swoosh it was gone. This happened with a low pressure like 2bar (30psi) but i was luck to be not in the line of the projectile. I'm sure that would have hurt.
  • 0


Rock
Private
Private
 
Posts: 19
Joined: Fri Aug 10, 2007 5:16 am
Reputation: 0

Unread postAuthor: shud_b_rite » Wed Aug 29, 2007 4:44 am

Come on guys, this problem is simple to get around.

Have a pin near the end of the barrel. Put the ammo down the barrel, the pin will stop it from falling down and then remove the pin from the side of the barrel and then boof.
  • 0

Airbeds... so many different uses
User avatar
shud_b_rite
1st Lieutenant
1st Lieutenant
 
Posts: 290
Joined: Tue Jan 30, 2007 7:10 pm
Location: Auckland, New Zealand
Reputation: 0

Next

Return to General Spud Cannon Related

Who is online

Registered users: Bing [Bot], Google [Bot], Yahoo [Bot]

Reputation System ©'