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 69 users online :: 6 registered, 0 hidden and 63 guests


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

Registered users: Bing [Bot], farcticox1, Google [Bot], Gussmoore, MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

marble shooter (now with videos and damage pics!)

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

Unread postAuthor: MrCrowley » Tue Mar 11, 2008 10:53 pm

I would say mildly improbable with marbles, they don't fly very straight. It would be possible, but I wouldn't bet on it.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: Lentamentalisk » Tue Mar 11, 2008 10:58 pm

But if I were to, say, rifle a pvc barrel and make custom hollow tailed iron or steel slugs at 150psi you think that is easy enough to get? How much on average would it drop over that distance?
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: MrCrowley » Tue Mar 11, 2008 11:01 pm

Lentamentalisk wrote:But if I were to, say, rifle a pvc barrel and make custom hollow tailed iron or steel slugs at 150psi you think that is easy enough to get? How much on average would it drop over that distance?


2.79189", but on a good day 2.6"






Just kidding, I shan't have the slightest of clues :D
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: jackssmirkingrevenge » Tue Mar 11, 2008 11:08 pm

Lentamentalisk wrote:How much on average would it drop over that distance?


It depends on the velocity and ballistic coefficient. I would expect such slugs (no need for rifling if they're hollow-tailed) top start out relatively slow, but not lose much velocity over 40 yards, so the drop would be less than a foot from the centreline of the barrel. If you zeroed your scope for that distance, there would be no need to compensate for drop.
  • 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: jook13 » Tue Mar 11, 2008 11:11 pm

yeah, I measured the distance today and it was actually about 34 yards. I dont see why a six inch spread at 40 yards is so unbelievable though, six inches isnt too accurate to begin with. too bad my barrel is bent now due to leaning against a wall for too long. As for the drop, I havent checked. It is impossible to see the marble in flight, but I guess I could do some tests at different distances to check it.

then again, maybe it was just 6 lucky shots.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: P.v.c.F.t.w. » Thu Apr 03, 2008 9:44 pm

Heh, finally found what I was looking for. This gun is exactly what I'm making at the moment, except I'm using pressure rated tubing to put the blowgun in the back of the stock (my gun is much smaller, 3/4 inch.) Almost exactly like yours, sounded like a good plan, and an easy way to aim. Have you found a way to mount a laser pointer on to the gun?
  • 0

User avatar
P.v.c.F.t.w.
Private
Private
 
Posts: 10
Joined: Thu Apr 03, 2008 9:23 pm
Reputation: 0

Unread postAuthor: Lentamentalisk » Fri Apr 04, 2008 12:07 am

P.v.c.F.t.w. wrote:Have you found a way to mount a laser pointer on to the gun?

Wireties? Duck Tape (yes it really is Duck tape, you ever tried using it on your ducts? It SUCKS!) Hose clamps? Use your imagination
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Fri Apr 04, 2008 1:42 am

P.v.c.F.t.w. wrote:Have you found a way to mount a laser pointer on to the gun?


Why not just buy a cheap adjustable sight like this one from ebay and epoxy a 20mm wide metal plate to your launcher?

Image
That way you'll have a professional looking sight that you can actually calibrate according to the fall of shot.
  • 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: P.v.c.F.t.w. » Fri Apr 04, 2008 7:15 am

Well, I already have a nice laser pointer, almost exactly like the one here: http://www.lasersale.com/catalog/displa ... asp?id=996.

I was thinking about fitting it snugly into a piece of pipe, sealing it in or whatever, and using large hose clamps to keep the piece of pipe attached to the barrel.[/url]

EDIT: A nice enough laser pointer.
  • 0

User avatar
P.v.c.F.t.w.
Private
Private
 
Posts: 10
Joined: Thu Apr 03, 2008 9:23 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Apr 04, 2008 7:26 am

Ah, but how are you going to zero it?
  • 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: P.v.c.F.t.w. » Fri Apr 04, 2008 7:41 am

*sigh*, no idea. I'm mainly trying to avoid taping it to the barrel. Or, I also could glue it onto one of my old Daisy scopes for airsoft guns, like this one: http://rodan.no/images/8047809.jpg. Also, using that one I could mount it to a metal plate, or one of those racks that is put on airsoft guns for attachments.

EDIT: Since the weblink doesnt work, here is a picture.
  • 0

Attachments
sight.jpg
Daisy Sight
sight.jpg (22.54 KiB) Viewed 362 times
User avatar
P.v.c.F.t.w.
Private
Private
 
Posts: 10
Joined: Thu Apr 03, 2008 9:23 pm
Reputation: 0

Previous

Return to Pneumatic Cannon Database

Who is online

Registered users: Bing [Bot], farcticox1, Google [Bot], Gussmoore, MSNbot Media, Yahoo [Bot]

Reputation System ©'