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Propane gun build

Last post by jimmy101 « Sat Jun 27, 2026 3:40 pm
Replies: 1
by Mb01 » Sun Jun 21, 2026 7:27 pm » in Combustion Cannons

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Before I build I want to see if my calculations are correct. If I start with the 1.5:1 ratio, I will have a 4 inch x 18 inch chamber and a 2 inch by...

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The propane should be 4%, so about 148cc.

Your chamber is 50% bigger than it needs to be. Might as well scale everything so that the fueling is a...

1 Replies

2147 Views

Last post by jimmy101
Sat Jun 27, 2026 3:40 pm
Boyles Law / Burnt Latkes Fuel Metering Calculation

Last post by Ratguy « Wed Jun 24, 2026 2:49 pm

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

5078 Views

Last post by Ratguy
Wed Jun 24, 2026 2:49 pm
Arborist Weight

Last post by Balthazar « Tue Jun 16, 2026 5:43 am
Replies: 8
by KA2AUB » Mon Apr 22, 2024 5:46 pm » in Ammo & Materials

First post

I have an air cannon with interchangeable barrels. so far, I have a 1 1/2 barrel and 1 barrel. I am trying to get paracord in a tree for my ham radio...

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Use a small fishing weight attached to your paracord. A 1-2 oz weight can help you cast the line into the tree.

8 Replies

132862 Views

Last post by Balthazar
Tue Jun 16, 2026 5:43 am
Need help on Pneumatic Air Cannon design!

Last post by farcticox1 « Sun Jun 07, 2026 3:54 pm
Replies: 1
by DaisyPukes » Thu May 21, 2026 2:46 am » in Pneumatic Cannons

First post

Hi everyone!

I'm a junior in high school and a noob about building pneumatic air cannons. For my physics 1 final, I decided to build a pneumatic air...

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Do you have a budget or access to parts. What ammo are you going to use ? I found airsoft a good place to start or even Nerf Rival can give good...

1 Replies

5106 Views

Last post by farcticox1
Sun Jun 07, 2026 3:54 pm
Stepper Motor Running in Reverse Direction

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

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

345922 Views

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

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