Search found 25938 matches

by jackssmirkingrevenge
Fri May 07, 2021 12:05 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: WORKING Simple Semi auto mechanism
Replies: 4
Views: 165

Re: WORKING Simple Semi auto mechanism

For rubber balls a simple breech like farcticox1 made here would do the trick, paintballs would get smashed though.
by jackssmirkingrevenge
Fri May 07, 2021 10:52 am
Forum: Hybrid Cannons
Topic: Xtreme-patator
Replies: 11
Views: 299

Re: Xtreme-patator

hectmarr wrote:
Fri May 07, 2021 10:27 am
wow is supersonic!! :o
I imagine some of your creations also exceed the speed of sound ;) even though your projects focus mostly on function and not maximum performance.
by jackssmirkingrevenge
Fri May 07, 2021 10:47 am
Forum: Pneumatic Cannons
Topic: Whats best valving for pneumatics
Replies: 5
Views: 225

Re: Whats best valving for pneumatics

Would the quickness of releasing the slide valve make any difference on a QEV to the speed of the projectile being launched. Faster piloting means faster valve opening which means better performance, to a point. Here is a virtual launcher modeled in GGDT: https://i.imgur.com/jaMwUuq.png As it is, w...
by jackssmirkingrevenge
Fri May 07, 2021 10:14 am
Forum: Hybrid Cannons
Topic: Xtreme-patator
Replies: 11
Views: 299

Re: Xtreme-patator

Voila with a 1 meter barrel:

Image

50cm barrel gives 319 m/s and 43J, 66cm gives 356 m/s and 53J
by jackssmirkingrevenge
Fri May 07, 2021 10:04 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1492
Views: 145012

Re: Short question topic

In this specific case, 1.8K means 1.8 psi x 1000, it is 1800 psi, about 124 bar. Thanks for your answer. I confirm that is the case, a 1800 psi burst disk is typically one you will find on the exit side of a 850 psi regulator on a paintball bottle. A 3000 psi bottle will typically have a 5K disk, a...
by jackssmirkingrevenge
Fri May 07, 2021 10:02 am
Forum: Pneumatic Cannons
Topic: How to make an Air cannon sound cooler/louder?
Replies: 11
Views: 269

Re: How to make an Air cannon sound cooler/louder?

The picture looks like theres more things going on, such as holes in the cone, and it looks like its disconnected from the barrel? While also being in a cylinder. The example I showed you is adjustable, with holes in the cone that allow you to vary the amount of noise. When the holes are completely...
by jackssmirkingrevenge
Tue May 04, 2021 8:00 am
Forum: Pneumatic Cannons
Topic: How to make an Air cannon sound cooler/louder?
Replies: 11
Views: 269

Re: How to make an Air cannon sound cooler/louder?

In my experience it amplifies the noise significantly for the shooter too.
by jackssmirkingrevenge
Sun May 02, 2021 8:12 am
Forum: SpudFiles Discussion
Topic: Well hello!
Replies: 1
Views: 225

Re: Well hello!

always good to see old faces pop-up again :)
by jackssmirkingrevenge
Sun May 02, 2021 8:11 am
Forum: Pneumatic Cannons
Topic: A look inside the "bleacher reacher" t-shirt launcher
Replies: 16
Views: 6045

Re: A look inside the "bleacher reacher" t-shirt launcher

I don't have pictures but if I recall well it was a simple poppet, much like a blowgun valve.
by jackssmirkingrevenge
Sun May 02, 2021 8:09 am
Forum: Pneumatic Cannons
Topic: Basic pneumatic cannon
Replies: 2
Views: 146

Re: Basic pneumatic cannon

A nice old school PVC/Sprinkler setup, looking good!
by jackssmirkingrevenge
Sun May 02, 2021 8:03 am
Forum: Pneumatic Cannons
Topic: Whats best valving for pneumatics
Replies: 5
Views: 225

Re: Whats best valving for pneumatics

Are you going for maximum performance?

If so, a burst disk is one of your best bets. The disadvantage is practicality, needing to install a new disk every time limits your rate of fire somewhat. That being said, going by your other thread you're pumping by hand so it doesn't really add much.
by jackssmirkingrevenge
Sun May 02, 2021 7:55 am
Forum: Combustion Cannons
Topic: Valvegun
Replies: 1
Views: 126

Re: Valvegun

Very post-apocalyptic, I like it :D
by jackssmirkingrevenge
Sun May 02, 2021 7:51 am
Forum: Hybrid Cannons
Topic: Xtreme-patator
Replies: 11
Views: 299

Re: Xtreme-patator

Bienvenu! I'm aiming at 20~30 Joules, to shoot invading nutrias on my pond One little note, we do not discuss shooting anything but inanimate objects on this forum. I made a little HGDT model of your idea wtih a modest chamber of about 100cc volume and a 75cm barrel and... 20-30 Joules? Even at 10x ...
by jackssmirkingrevenge
Sun May 02, 2021 7:36 am
Forum: Hybrid Cannons
Topic: HGDT calculator
Replies: 1
Views: 106

Re: HGDT calculator

You can find HGDT and GGDT here I'm an "old one" from French forum "patatorforum" which is sadly quite dead due to restrictive laws and kids not experimenting anymore, but seing spudfiles is still quite active gave me the smile for the day Dommage... alas it seems the situation is the same around th...