I am not sure about a muzzle brake, I will see if I have enough shop hours available to make one. I did go with that design with some modifications, the complete cross section of the cannon looks like this: assembly.png The bolt holes are not in the right places in the section picture because I woul...

Some time has passed and I have done lots of progress on the cannon: IMG_20160212_130818_small.jpg IMG_20160212_130853_small.jpg IMG_20160212_131357_small.jpg IMG_20160212_131415_small.jpg There are some holes to be drilled and tapped so that I can get all the bolts screwed in but this is basically ...

I have done some progress during the few weeks since my last update. The chamber cap is now in good shape, I still have to bore the hole to 55mm ID and then do some drilling and tapping and an o-ring groove. A few pictures of it: IMG_20151217_151441_small.jpg IMG_20151217_151500_small.jpg IMG_201512...

I have never fired a hybrid before but I have experience of real large cannons, I have myself fired 130mm and 122mm cannons and seen probably several hundred shots, they make some noise. I have lots of space to shoot at where my parents live, there is lots of forest and fields and the few neighbors ...

http://i63.tinypic.com/2h6bnts.jpg Here is the barrel I got today, it is larger than I had planned but when they didnt have any smaller pipe with thick walls and smooth inside surface I got this for my cannon. It is 55mm ID and 70mm OD, meaning 7.5mm wall thickness. It is 355MPa yield strength stee...

You can make threaded bolt hole circle in the chamber pipe ends if the wall thickness is sufficient. It's more compact and cleaner look then tie rod type. I know I could and the wall thickness would allow it, but it would require me to make the chamber volume smaller to keep the same theoretical bu...

I dont know about the projectiles yet, I could machine some darts or maybe make a lead casting mold for some balls or supersized airgun type pellets. The barrel diameter will be around 30mm, I have not yet searched for a good barrel pipe from my local hardware store. The gun will be pretty heavy whe...

Hi all, I have been following these forums for several years but this is actually my first post. I am from Finland and I have done some simple coke bottle pneumatic launchers years ago and I have also built a small ETG two years ago that can shoot a 4mm diameter piece of steel through a 10mm thick a...