That makes me wonder if maybe bigger and or longer bolts might have been a good idea. Maybe 5/8" bolts 1" longer next time? That would significantly increase sectional density. Just remember to keep the centre of gravity ahead of the centre of pressure. http://www.rockets4schools.org/images/Basic.R...

Great to see this finished! Love the renderings as well, they'll come in handy when helping people build similar cannons. If you want, upload some renderings with your username on them to save us having to attribute the renderings to you if we use them elsewhere on the forum (or in youtube videos).

It depends on how you're fuelling. There have been several different approaches.

However, the maths for two common approaches is already addressed here: http://www.spudfiles.com/hybrid-cannons/topic13602.html

CannonCreations wrote:Thank you for your advice, I really appreciate your input.

That's what the forum is for be careful though, it's not all wins: http://www.spudfiles.com/hybrid-cannons/topic21645.html

This is one of my first successful hybrids, take a patient look through this thread: http://www.spudfiles.com/hybrid-cannons/topic21655.html http://www.spudfiles.com/resources/image/18180 You can use a commercial spark ...

if you can't figure it out from here then you probably shouldn't make one http://www.spudfiles.com/hybrid-cannons/topic21655.html

... up to be 1 ignored and/or 2, flamed for not looking around yourself. Cannons require some ingenuity, thought, and design of your own. Look around ... by step guides for anything more than an extremely basic cannon. With a hybrid in particular, they can be dangerous and require even more care than ...

Ive done several 2000-3000psi cannons and PCP rifles but never with a home made QEV, and thats what my current project will be. All parts must be special ordered and are pretty pricey but have ratings of 3000 psi working pressure and burst ...

... accidents however, plenty out there :wink: 3000 psi is no joke, mix 10 hybrids don't go much higher than 1000 psi. At that pressure level standard ... has been with high pressure pnuematics. Ive done several 2000-3000psi cannons and PCP rifles but never with a home made QEV, and thats what my ...

*cough* cartridges *cough*

http://www.spudfiles.com/hybrid-cannons/topic19504.html

Hello everyone, first let me say a few things. I have been building cannons for almost 10 years. I consider myself to be pretty knowledgable of ... and combustion cannons. Recently I decided to explore the world of hybrids, and having never built one I did tons of research. I wanted to use ...

Spudchukker III - Venting Piston Hybrid https://dl.dropboxusercontent.com/u/25331835/tater%20cannon/Showcase/SpudchukkerIII%20Final%20Render.JPG ... You can find the build log for the cannon here: http://www.spudfiles.com/hybrid-cannons/topic25087.html As mentioned in the other thread, I took major ...

... properties of welds/pressure vessels. Here are some examples of hybrid cannons that have custom machined/welded parts: http://www.spudfiles.com/forums/lardas-first-hybrid-hygac20-t15524.html ...

This is yet another of my completely un-planned cannons, seeing a pack of these on the shelf: http://i261.photobucket.com/albums/ii62/balee88/P1020211.jpg ... I thought I'd give it two independently firing barrels and chambers. Finally hybrids are noisy beasts so barrel shrounds / suppressors were mandatory. ...