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What's the next big thing?

Last post by Dumbascii « Thu Jul 09, 2026 1:08 pm
Posted in Combustion Cannons

by Dumbascii » Thu Jul 09, 2026 1:08 pm » in Combustion Cannons

Thanks @PCGUY inviting me to return after all these years.

What are the most dangerous things (combustion) since the Taternator II ? I lost...

0 Replies

3787 Views

Last post by Dumbascii
Thu Jul 09, 2026 1:08 pm
Boyles Law / Burnt Latkes Fuel Metering Calculation

Last post by Ratguy « Wed Jun 24, 2026 2:49 pm
Posted in Combustion Cannons

by Ratguy » Wed Jun 24, 2026 2:49 pm » in Combustion Cannons

This is more of an informational post for people who are starting out and are not familiar with Boyles law. I decided to post this because I was...

0 Replies

5256 Views

Last post by Ratguy
Wed Jun 24, 2026 2:49 pm
Stepper Motor Running in Reverse Direction

Last post by mrfoo « Wed Jun 03, 2026 10:52 am
Posted in Off-Topic Hobbies

by mrfoo » Wed Jun 03, 2026 10:52 am » in Off-Topic Hobbies

Steppers have a maximum speed, if you're running close to that or running under heavy load, it may miss steps, resulting in back stepping depending...

0 Replies

415462 Views

Last post by mrfoo
Wed Jun 03, 2026 10:52 am
Compression?

Last post by overdraft « Mon Apr 27, 2026 12:48 pm
Posted in Combustion Cannons

by overdraft » Mon Apr 27, 2026 12:48 pm » in Combustion Cannons

Hi All!
I'm making a basic spud gun for an upcoming distance competition that is restricted to hairspray as fuel.
Obviously combustion in engines is...

0 Replies

23421 Views

Last post by overdraft
Mon Apr 27, 2026 12:48 pm
Leveraging server-grade hardware for high-precision cannon simulations?

Last post by boteh35959 « Mon Apr 20, 2026 9:01 am
Posted in Off-Topic Hobbies

by boteh35959 » Mon Apr 20, 2026 9:01 am » in Off-Topic Hobbies

Hey guys,
I’ve been a long-time fan of the technical depth on this board. Lately, I've been getting really into the weeds with valve efficiency and...

0 Replies

19093 Views

Last post by boteh35959
Mon Apr 20, 2026 9:01 am
Does anyone here have a 4 inch cannon and wants some free prototype shells?

Last post by JimmyT « Wed Mar 25, 2026 2:29 am
Posted in General Cannon Discussion

by JimmyT » Wed Mar 25, 2026 2:29 am » in General Cannon Discussion

I recently got a 4 footer of 1 inch allthread rod, and I intend to use it for the good of mankind. (I'm going to be making some big ass sabot rounds...

0 Replies

669656 Views

Last post by JimmyT
Wed Mar 25, 2026 2:29 am
Semi auto airgun conversion project

Last post by Sarnento « Sun Jan 18, 2026 7:02 pm
Posted in BB, Airsoft, and Pellet Guns

by Sarnento » Sun Jan 18, 2026 7:02 pm » in BB, Airsoft, and Pellet Guns

Recently got into additive manufacturing, and thought about the possibility of something like a conversion from bolt action to semi auto could be...

0 Replies

288946 Views

Last post by Sarnento
Sun Jan 18, 2026 7:02 pm
Pneumatic cannon not firing consistently – help needed

Last post by Driftboss3d « Tue Nov 11, 2025 9:17 pm
Posted in Combustion Cannons

by Driftboss3d » Tue Nov 11, 2025 9:17 pm » in Combustion Cannons

Hi everyone,
I’ve been building a pneumatic cannon using 2 PVC, a 120 psi compressor, and a quick-connect valve, but I’m having an issue: the spud is...

0 Replies

141000 Views

Last post by Driftboss3d
Tue Nov 11, 2025 9:17 pm
Anyone use theirs as a frozen bait launcher?

Last post by Broylz « Sat Jul 05, 2025 4:10 pm
Posted in Pneumatic Cannons

by Broylz » Sat Jul 05, 2025 4:10 pm » in Pneumatic Cannons

I have recently completed my first build with a 4” pic chamber of 48” reduced down to 2” and then down again to 1.5” with a pair of street elbows to...

0 Replies

224420 Views

Last post by Broylz
Sat Jul 05, 2025 4:10 pm
Where do I fire this thing?

Last post by CraigRepublic « Tue Apr 01, 2025 6:51 pm
Posted in Combustion Cannons

by CraigRepublic » Tue Apr 01, 2025 6:51 pm » in Combustion Cannons

Hello! This is my first time posting and first time building a potato cannon. Im very confused on where I can fire this thing.

I know that most of...

0 Replies

178463 Views

Last post by CraigRepublic
Tue Apr 01, 2025 6:51 pm
Bell Reducer or Flush Hub Bushing

Last post by mick04u « Thu Mar 20, 2025 12:25 pm
Posted in Combustion Cannons

by mick04u » Thu Mar 20, 2025 12:25 pm » in Combustion Cannons

Hello, I’m building a potato gun with a 4” combustion chamber and a 2” barrel. What would be a stronger transition from the 4” to 2” pipe, a bell...

0 Replies

183176 Views

Last post by mick04u
Thu Mar 20, 2025 12:25 pm
3d printed QEV

Last post by Laser diode « Tue Dec 17, 2024 4:01 pm
Posted in Pneumatic Cannons

by Laser diode » Tue Dec 17, 2024 4:01 pm » in Pneumatic Cannons

I had an aluminum qev that worked great but I noticed many things about it that could be improved so I decided to try to make one myself. At first I...

0 Replies

220670 Views

Last post by Laser diode
Tue Dec 17, 2024 4:01 pm
Pneumatic System Using 1/4 Inch Steel Balls

Last post by byron555 « Sun Dec 15, 2024 8:45 pm
Posted in Pneumatic Cannons

by byron555 » Sun Dec 15, 2024 8:45 pm » in Pneumatic Cannons

Hello, I own a 1/4 inch slide valve set combined with a QEV and would like to build or find an optimized semi-automatic loader to use with 1/4 inch...

0 Replies

221062 Views

Last post by byron555
Sun Dec 15, 2024 8:45 pm
Confused about stepper motors

Last post by Selma « Fri Dec 13, 2024 2:03 am
Posted in General Cannon Discussion

by Selma » Fri Dec 13, 2024 2:03 am » in General Cannon Discussion

How do I connect a stepper motor to a circuit board. I'm very new to this and need a little help.

I have a k8055 and a hybrid stepper motor, size 11...

0 Replies

218343 Views

Last post by Selma
Fri Dec 13, 2024 2:03 am
Pneumatic System Using 1/4 Inch Steel Balls

Last post by byron555 « Mon Dec 09, 2024 8:45 pm
Posted in Pneumatic Cannons

by byron555 » Mon Dec 09, 2024 8:45 pm » in Pneumatic Cannons

Hello, I own a 1/4 inch slide valve set combined with a QEV and would like to build or find an optimized semi-automatic loader to use with 1/4 inch...

0 Replies

220099 Views

Last post by byron555
Mon Dec 09, 2024 8:45 pm
Pneumatic System Using 1/4 Inch Steel Balls

Last post by byron555 « Sun Dec 08, 2024 8:56 pm
Posted in Pneumatic Cannons

by byron555 » Sun Dec 08, 2024 8:56 pm » in Pneumatic Cannons

Hello, I own a 1/4 inch slide valve set combined with a QEV and would like to build or find an optimized semi-automatic loader to use with 1/4 inch...

0 Replies

220224 Views

Last post by byron555
Sun Dec 08, 2024 8:56 pm
Making a Snow Cannon

Last post by byron555 « Fri Dec 06, 2024 5:33 am
Posted in Pneumatic Cannons

by byron555 » Fri Dec 06, 2024 5:33 am » in Pneumatic Cannons

Hello, this year I want to make the traditional snowball fights more interesting and exciting this winter by making a snow cannon that can launch...

0 Replies

215489 Views

Last post by byron555
Fri Dec 06, 2024 5:33 am
Vintage cap gun to potato gun conversion...

Last post by musket « Wed Dec 04, 2024 10:16 pm
Posted in Miniature Cannons

by musket » Wed Dec 04, 2024 10:16 pm » in Miniature Cannons

Hello all...my first post! So....I have a long barrell musket/rifle cap gun I want to make shoot potato. It's made of metal and wood. My thought is...

0 Replies

215526 Views

Last post by musket
Wed Dec 04, 2024 10:16 pm
Can someone help me build a tennis ball Launcher

Last post by Opob « Sun Nov 03, 2024 1:51 pm
Posted in General Cannon Discussion

by Opob » Sun Nov 03, 2024 1:51 pm » in General Cannon Discussion

Im a complete noobie and ive tried looking around and cant find something in good detail about how to make something.I tried looking through the wiki...

0 Replies

218973 Views

Last post by Opob
Sun Nov 03, 2024 1:51 pm
QDV Piston leak question

Last post by Pro « Tue Oct 29, 2024 4:47 pm
Posted in Pneumatic Cannons

by Pro » Tue Oct 29, 2024 4:47 pm » in Pneumatic Cannons

Regarding the famous QDV valve as outlined in this video:

There is one thing I am not understanding.
Once the rod is retracted and the piston...

0 Replies

197744 Views

Last post by Pro
Tue Oct 29, 2024 4:47 pm
Trying to get better power and range out of my tennis ball launcher

Last post by ColtD « Tue Oct 22, 2024 4:38 pm
Posted in Pneumatic Cannons

by ColtD » Tue Oct 22, 2024 4:38 pm » in Pneumatic Cannons

Joined cause im a bit stuck in my design/testing of my launcher and hoping i can get some ideas to add velocity and power to my projectiles. Im...

0 Replies

198019 Views

Last post by ColtD
Tue Oct 22, 2024 4:38 pm
High mixture hybrid gun "fuel cartridges" proposal

Last post by YBCO666 « Mon Oct 21, 2024 1:05 am
Posted in Hybrid Cannons

by YBCO666 » Mon Oct 21, 2024 1:05 am » in Hybrid Cannons

Well, I don't have the money, or the equipment, or the room to make a hybrid gun (100x+ mixture), the best I could do is make the 3D plans and see if...

0 Replies

218566 Views

Last post by YBCO666
Mon Oct 21, 2024 1:05 am
GAW 770 by Grégory

Last post by Turbine32 « Wed Sep 11, 2024 3:30 am
Posted in Hybrid Cannons

by Turbine32 » Wed Sep 11, 2024 3:30 am » in Hybrid Cannons

Bonjour à tous je suis français et en France pas beaucoup de monde ose les choses... Mais moi je le fais !
Pour continuer à faire vivre nôtre plaisir...

0 Replies

216801 Views

Last post by Turbine32
Wed Sep 11, 2024 3:30 am
Newbie builder, need some help on a school project

Last post by Potatolauncher424 « Sat Sep 07, 2024 9:06 pm
Posted in General Cannon Discussion

by Potatolauncher424 » Sat Sep 07, 2024 9:06 pm » in General Cannon Discussion

Hey potato launchers! (or whatever y'all call each other! XD) I've been researching for a potato gun project at school and need some help. I can't...

0 Replies

215746 Views

Last post by Potatolauncher424
Sat Sep 07, 2024 9:06 pm
School project potato cannon

Last post by Techexical « Wed Aug 28, 2024 11:58 pm
Posted in Combustion Cannons

by Techexical » Wed Aug 28, 2024 11:58 pm » in Combustion Cannons

Hey all, I am building a combustion potato cannon for a school project, a 1.5 inch ABS pipe based cannon (I know, pretty risky seeing how people see...

0 Replies

217579 Views

Last post by Techexical
Wed Aug 28, 2024 11:58 pm

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