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

In total there are 47 users online :: 2 registered, 1 hidden and 44 guests


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

Registered users: Bing [Bot], Google [Bot] based on users active over the past 5 minutes
The Team
Administrators
administrators.png PCGUY
Global Moderators
global_moderators.png Brian the brain
global_moderators.png CS
global_moderators.png jrrdw
global_moderators.png MrCrowley

Odd but effective alternate ammo

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
Sponsored 
  • Author
    Message

Odd but effective alternate ammo

Unread postAuthor: Cthulhu » Mon Nov 20, 2017 11:03 am

I'm sure we've all used some pretty weird things shoved into a Spud gun barrel to shoot, but have you ever used something so strange yet it actually has good performance?

I recently built a cheap-o sprinkler valve mortar with 2" PVC and I was amazed that empty caulk tubes could fly up to 500 feet!
  • 0

Attachments
IMG_20171120_100030~2.jpg
The caulk tube fits very well into the 2 inch PVC and has a hollow back and heavy head to fly far and accurate.
IMG_20171120_100054~2.jpg
The 1 day build mortar, I may make a thread on it but it's pretty standard
This weapon serves to silence the noisy speakers of the stupid of the other street! (joke) -Hectmarr
User avatar
Cthulhu
Master Sergeant
Master Sergeant
 
Posts: 172
Joined: Wed Apr 12, 2017 7:07 pm
Location: South Texas
Country: United States (us)
Reputation: 18
Top

Share On:

Share on Facebook Facebook Share on Twitter Twitter Share on Digg Digg Share on Reddit Reddit Share on Tumblr TumblrShare on Google+ Google+

Re: Odd but effective alternate ammo

Unread postAuthor: jackssmirkingrevenge » Mon Nov 20, 2017 11:35 am

Careful what you point it at, you don't want to call 911 to say someone has been injured by a flying caulk :D
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25523
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 295
Top

Re: Odd but effective alternate ammo

Unread postAuthor: mrfoo » Mon Nov 20, 2017 11:44 am

you don't want to call 911 to say someone has been injured by a flying caulk


Especially if your accent makes it come out as "flying cock".
  • 0

User avatar
mrfoo
Staff Sergeant
Staff Sergeant
 
Posts: 110
Joined: Wed Apr 29, 2015 11:05 am
Country: Afghanistan (af)
Reputation: 13
Top

Re: Odd but effective alternate ammo

Unread postAuthor: jackssmirkingrevenge » Mon Nov 20, 2017 11:53 am

mrfoo wrote:Especially if your accent makes it come out as "flying cock".


http://thatsthejoke.com
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25523
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 295
Top

Re: Odd but effective alternate ammo

Unread postAuthor: Air2theBrain » Mon Nov 20, 2017 2:39 pm

500ft! :shock:

How much does that tube weigh..? :P

How much psi did you use? 8)
  • 0


Air2theBrain
2nd Lieutenant
2nd Lieutenant
 
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am
Country: Canada (ca)
Reputation: 13
Top

Re: Odd but effective alternate ammo

Unread postAuthor: Cthulhu » Mon Nov 20, 2017 5:38 pm

Air2theBrain wrote:500ft! :shock:

How much does that tube weigh..? :P

How much psi did you use? 8)


I haven't weighed the tube, but when I do I'll post it.
I'm running at only around 40 psi. The reason for the immense range is that since it's a mortar it's fired at 45°. When aimed horizontally it only goes about 45-50 feet.

I'll probably make a separate thread about it later, but I want to build the bipod and baseplate first.
  • 0

This weapon serves to silence the noisy speakers of the stupid of the other street! (joke) -Hectmarr
User avatar
Cthulhu
Master Sergeant
Master Sergeant
 
Posts: 172
Joined: Wed Apr 12, 2017 7:07 pm
Location: South Texas
Country: United States (us)
Reputation: 18
Top

Re: Odd but effective alternate ammo

Unread postAuthor: Cthulhu » Tue Nov 21, 2017 9:21 pm

The caulk tubes sadly break after hitting the ground so many times, so I've been trying to replicate their design, but I encountered some problems.

How do you calculate the optimal mass for a projectile to get the best range?

Is there a way I can get my projectile to whistle as it flies?
  • 0

This weapon serves to silence the noisy speakers of the stupid of the other street! (joke) -Hectmarr
User avatar
Cthulhu
Master Sergeant
Master Sergeant
 
Posts: 172
Joined: Wed Apr 12, 2017 7:07 pm
Location: South Texas
Country: United States (us)
Reputation: 18
Top

Re: Odd but effective alternate ammo

Sponsored

Sponsor
 

Re: Odd but effective alternate ammo

Unread postAuthor: Air2theBrain » Wed Nov 22, 2017 5:03 am

Found this link, looks heavy mathematical. :shock:
https://www.whitman.edu/Documents/Acade ... lsmith.pdf
  • 0


Air2theBrain
2nd Lieutenant
2nd Lieutenant
 
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am
Country: Canada (ca)
Reputation: 13
Top

Re: Odd but effective alternate ammo

Unread postAuthor: jackssmirkingrevenge » Wed Nov 22, 2017 6:02 am

Cthulhu wrote:How do you calculate the optimal mass for a projectile to get the best range?


GGDT includes an External Ballistics Tool that can be helpful.

Is there a way I can get my projectile to whistle as it flies?


Stick one of these on the front ;)

Image
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25523
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 295
Top

Re: Odd but effective alternate ammo

Unread postAuthor: Air2theBrain » Wed Nov 22, 2017 6:29 am

Jack i was thinking of these when i read this post also. :)

For something funny i would throw an actual whistle in the tube.

You wanted it to whistle right? :P

I heard of a guy putting a whistle in his blow off valve for his car...would have made people turn their heads thinking a referee was on the streets.
  • 0


Air2theBrain
2nd Lieutenant
2nd Lieutenant
 
Posts: 222
Joined: Wed Apr 12, 2017 5:30 am
Country: Canada (ca)
Reputation: 13
Top

Re: Odd but effective alternate ammo

Unread postAuthor: jackssmirkingrevenge » Wed Nov 22, 2017 6:51 am

I heard of a guy putting a whistle in his blow off valve for his car...would have made people turn their heads thinking a referee was on the streets.


Antonios, Mentale!!! :D

hehehe been a while since the last Chanel 9 Neus reference on this forum, @POLAND_SPUD where you at?
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25523
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 295
Top

Re: Odd but effective alternate ammo

Unread postAuthor: Cthulhu » Wed Nov 22, 2017 11:57 am

Air2theBrain wrote:Found this link, looks heavy mathematical. :shock:
https://www.whitman.edu/Documents/Acade ... lsmith.pdf


That's mostly about optimal launch angle rather than optimal mass, funnily enough I've actually seen that exact article in my physics class a couple years ago to show the proof behind the whole "45°" launch angle belief.

Found a way to get it to whistle without having to buy a nerf football: I cut the head off a nerf mega dart (which have whistles built in) and glued it to the head of my projectile.


Mass is still a problem.
  • 0

This weapon serves to silence the noisy speakers of the stupid of the other street! (joke) -Hectmarr
User avatar
Cthulhu
Master Sergeant
Master Sergeant
 
Posts: 172
Joined: Wed Apr 12, 2017 7:07 pm
Location: South Texas
Country: United States (us)
Reputation: 18
Top

Re: Odd but effective alternate ammo

Unread postAuthor: jackssmirkingrevenge » Wed Nov 22, 2017 12:23 pm

Mass is still a problem.


Pour some cheap epoxy into the head ;) I would really suggest you play with GGDT to figure out the optimal weight for the parameters you are using.

That's mostly about optimal launch angle rather than optimal mass, funnily enough I've actually seen that exact article in my physics class a couple years ago to show the proof behind the whole "45°" launch angle belief.


For a drag stabilized projectile it's usually closer to 55 degrees.

Fr Frog has some relevant data on the Fin Stabilized M829 anti-tank round.
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25523
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 295
Top

Re: Odd but effective alternate ammo

Unread postAuthor: Cthulhu » Wed Nov 22, 2017 4:53 pm

I dumped a bunch it bits of scrap metal into the body and sealed it with hotglue under a foam disk. It exploded as it left the barrel, but it's a start!
I put an ad out on Craigslist saying I was buying used caulk tubes, let's see if I get any bites!
  • 0

This weapon serves to silence the noisy speakers of the stupid of the other street! (joke) -Hectmarr
User avatar
Cthulhu
Master Sergeant
Master Sergeant
 
Posts: 172
Joined: Wed Apr 12, 2017 7:07 pm
Location: South Texas
Country: United States (us)
Reputation: 18
Top

Re: Odd but effective alternate ammo

Unread postAuthor: jackssmirkingrevenge » Wed Nov 22, 2017 4:56 pm

Cthulhu wrote:I put an ad out on Craigslist saying I was buying used caulk tubes, let's see if I get any bites!


"Hi, heard you were paying for used caulk?"

"Uhh..."
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25523
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 295
Top
Next

Return to Construction Materials/Ammo Discussion

Who is online

Registered users: Bing [Bot], Google [Bot]
SpudFiles skin originally developed by: John Olson - Modifed by PCGUY
Under the hood dynamics run by phpBB®
Enhanced with SEO and KISS
Reputation System ©'