Brownie points to the one who can explain this cannon video
Posted: Sun Jun 16, 2019 9:07 pm
by Moonbogg
What is going on here? The video has strange music and there is something artistic about the whole thing that I love, but I am wondering what is going on inside this cannon? What kind of "valving" do you think they might have in there that would have broken with an oxy/fuel shot?
This whole cannon looks freakish and crazy. How do you think this thing used to work?
Also, they use bolts in shear to hold the end caps on. I know this is a thing and people do it, but I don't like it for some reason. I imagine the holes loosening over time and I don't like the complete lack of pre-tension with a shear configuration. What are your thoughts on using bolts like that? Is it fine? No big deal? It bugs the hell out of me.
Re: Brownie points to the one who can explain this cannon vi
Posted: Mon Jun 17, 2019 1:05 am
by D_Hall
First impressions....
They've mad machinist skills and access to equipment but don't know a damned thing about gun designs. This is evidenced by obviously having to zero in on the fuel/air mixture via experimentation. Anyone who's put that much work into a gun should never experience a misfire. **NEVER**.
About the bolts in shear... I think this is just further evidence of them not knowing proper design or perhaps demonstrates a gap in their equipment. Putting bolts in shear like that can allow for easy O-ring seals and the like at the price of non-optimal structures. This doesn't have to be a problem provided you design for it. When you design for it, however, you typically end up using a fair number of fasteners. They appear to use six. SIX?? Yeah, I'm betting they put zero thought into it.
Valving? Just a guess, but I'm going with this being a very early valved hybrid attempt using diaphragm valve in a coaxial configuration. Zero knowledge, but that's what the overall look of the gun screams to me.
Re: Brownie points to the one who can explain this cannon vi
Posted: Mon Jun 17, 2019 5:16 am
by jackssmirkingrevenge
D_Hall wrote:They've mad machinist skills and access to equipment but don't know a damned thing about gun designs. This is evidenced by obviously having to zero in on the fuel/air mixture via experimentation. Anyone who's put that much work into a gun should never experience a misfire. **NEVER**.
Agreed, and playing with oxygen in that situation is really not a good idea.
Re: Brownie points to the one who can explain this cannon vi
Posted: Mon Jun 17, 2019 5:17 am
by jrrdw
This video was posted to YouTube 4 years ago and the web address in the end of the video didn't work for me.
Re: Brownie points to the one who can explain this cannon vi
Posted: Mon Jun 17, 2019 5:22 am
by jackssmirkingrevenge
jrrdw wrote:This video was posted to YouTube 4 years ago
Just over 7 years:
Published on Feb 15, 2012
url is down for me too, hopefully our intrepid inventor didn't blow himself up.
Re: Brownie points to the one who can explain this cannon vi
Posted: Mon Jun 17, 2019 12:57 pm
by Moonbogg
Nice analyses and comments. I can't get over that freakish music, and the website doesn't work for me either. That was the first thing I tried. I'd love a closer look at this cannon and how it works, but we may be out of luck for anything more than this video.
Re: Brownie points to the one who can explain this cannon vi
Posted: Tue Jun 18, 2019 5:39 am
by jrrdw
The chamber wasn't built very well...
Re: Brownie points to the one who can explain this cannon vi
Posted: Mon Jul 01, 2019 9:38 am
by mark.f
archived
Looks like he had been working on it long before 2012 it seems, although of course since it's a smaller site the actual page on the gun isn't archived. Looks like your typical "buy an oxy-propane/butane torch from Lowes and plumb it into a cannon" cannon with more money to burn but not enough know-how.
(by the way, what's up Moonbogg?)
