... give me some insight on the benefits of pulling a vacuum in the barrel, as you seem to have tested everything.. I know of those ping pong vacuum cannons reaching 860m/s, but would I see a real benefit with a heavier projectile? It sure would be nice to break 1km/s with a golf ball, if at all ...

I am planning on using the power of hybrid cannons as a project for my thermodynamics class and pretend to be doing a lot of tests on it. Always ...

I am planning on using the power of hybrid cannons as a project for my thermodynamics class and pretend to be doing a lot of tests on it. Always ...

... of my hands. But now, 3 years later I am planning on using the power of hybrid cannons as a project for my thermodynamics class and pretend to be doing a lot of tests on ...

... needed to push past the sound barrier with a golf ball. I know the 10X hybrids are supersonic. I wonder if 5 or 6x would get there. I'd want an ... I wanted that much power I'd likely just start researching black-powder cannons. They can be made and used legally if done right. It would be more ...

Such a pity the videos are no longer available, came too late here There seems not to be many videos on Youtube of hybrid cannons of this quality, it's impressive indeed. The minimalist design certainly sets it apart

... something like this work before. I've seen semi-automatic pneumatic cannons, but hybrid fueling is way more complex and much harder to get right, but you pulled it off. Your ...

... something like this work before. I've seen semi-automatic pneumatic cannons, but hybrid fueling is way more complex and much harder to get right, but you pulled it off. Your ...

I have built a few pneumatic cannons before and I am planning to make a hybrid cannon. I would rather use a piston valve than a burst disc. I want to do a 5-10x propane, but I don't ...

The elusive two stage hybrid! We spoke of it before but good to see that you are seriously contemplating it! You almost certainly do not need the second ignition system. The piston moving to the left will adiabatically compress the ...

The elusive two stage hybrid! We spoke of it before but good to see that you are seriously contemplating it! You almost certainly do not need the second ignition system. The piston moving to the left will adiabatically compress the mixture ...

... At least you aren't using PVC. We've seen what often happens with hybrid PVC cannons.

That looks about right. One good thing about hybrids is that the pressure spike is just that, not a constant pressure in the chamber that you would get from a high pressure pneumatic launcher. Also, what factor of safety would you aim for? You'll ...

... I think a guy around here used 3D printed plastic parts for his 10X hybrid, although the core was still a steel rod. If the pilot pressure is ... around here and those performed great. http://www.spudfiles.com/hybrid-cannons/topic26921-30.html

... to do something to help the mixing. Also, on the first shot of the "hybrid shots" video, listen to that smooth breech clunk softly as it closes. I swear, the best thing about my last two cannons is adhesive backed UHMWPE, lol. I absolutely love the hell out of that stuff. ...