Ok, Ive got everything cut except the barrel. Here is my dry fit. This will be my second gun. My first gun was a propane over/under 3" chamber- 1.5 inch barrel with BBQ igniter. I put it together pretty quick, and I didn't understand the whole chamber fan thing. I think not having that was my bigges...

Make sure the air mattress fan has enough pressure to blow through the checkvalve. I did check that, and it does blow through, although there is quite a bit of resistance. I actually went up to a larger 2" check valve because the spring in the smaller one seemed stronger. This cannon is either goin...

hi wrote: it might suck it open, but not till after the projectile is out the barrel, so it wont matter anyway.

Good point. I will try it and see what happens. Im sure I am overthinking this too much.

Im in the process of building a gun which will have an air mattress fan and a check valve. Since the flow direction of the check valve will be facing into the chamber, I imagine the force of the combustion will pull the valve open a little and pull in some air. I'm wondering what effect, if any, tha...

I hate to admit it, but I used the same fuel calc and was coming up really high too. Eventually, I realized that I was using Diameter to calculate the volume of my cylinder rather than Radius like the conversion tool requested. For that reason my first spudgun has a 12" 3/8" meter pipe. Aside from b...

I have to ask, though, about your fan placement. Is it all the way towards the front, (barrel end), of the chamber? And which way is it pointing? Not too important but I'm just curious. Judging by the photos I would say the chamber fan is at the back of the chamber (note the location of the propane...

iturnrocks wrote: Im still working on #1

Heres the general idea for #1 if I can find a small enough fan. I may use 2 or 3.

Co-axial combustions tend to preform poorly because: 1) It's hard to get a proper, even mixture in them. 2) They hard to vent effectively. 3) The shape of the combustion cavity is not ideal for burning stuff in. Heres my solution to #2. Im still working on #1, and I will probably be stuck with #3. ...

Well, maybe not everything... [/quote]

Did you ever make anything out of that?

Just make sure you dont pick it up while the construction crew is there.

believe me..combustion coaxials are not worth it..they arent powerful... Does anyone know why they arent powerful? Has a comparison been done with a coaxial and an inline with the same volume combustion chamber/ barrel size? I suppose if this turns out to be true for me, I will just screw in the ov...

I recently built my first gun- an over/under metered propane combustion. After seeing photos of the Locutus without the barrel I have been thinking about building a similar looking coaxial. Most of what I have read about combustion coaxials is that there is not enough support for the barrel inside t...

sandman wrote:i believe it is called the Locutus so try searching that

Yes it is the Locutus. Thank you.


http://www.spudfiles.com/forums/pg255-locutus-t203.html

This cannon is famous enough to be on this site many times, but Im curious about its features and how it works. Is there a post that explains this cannon? Ive tried to search, but I dont really know enough about it to get a good search.