my giant cannon. not really getto

[vblock]

hows it going guys ? I hope im doing this right im not so good on the computer but my cannon seams decent . here is some specs. Chamber size. 4"x48" abs. only because i have had bad experinces with pvc . the barrle is 1 1/4 with 3 sections for easy transport to 3 foot pieces and a 2 footer to finish er off . the spark gap is just 3 bolts to form the gap and a electric bbq inginiter modded to use a seprate battery pack normals 1 AA but with to in series i get twice as fast shots with better sparks . it has a 3 1/2 " fan i think no quite shure. i think it takes about 55 psi i forget and the meter is ran off a bernzomatic torch modded to do the job all i do is turn it on when the psi guage reads 55 i close the ball valve and turn it off. i think im only getin about 150 yards to be truthfull and im told im splittin potatos. what you think ?

[jackssmirkingrevenge]

my pictures are to big how do i fix this

Open them with Paint

Click on "Image" on the toolbar then "Stretch/Skew"

Change "Horizontal" and "Vertical" to 50% isnead of 100%

[vblock]

thanks alot man ill upload some then

welll what does everyone think ;D. what you think my range will be ?

Edited by jrrdw.

[jackssmirkingrevenge]

Not a bad effort in terms of performance, if it's range you want then potatoes are the worst possibly ammunition - low density, poor aerodynamic shape and no stability.

For maximum range, you'll need to make some sort of saboted dart along these lines:

[deathbyDWV]

Looks good. Just be careful. Give us some damage pics soon!

[SpudBlaster15]

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[vblock]

thanks alot man ill think about that . and haha ill try but the one gap seams to spark well spud blaster in the cold it takes 3 three seconds to fire ? with decent ammo hows 200 yards ? is it too big you guys think ? i dont reallly know what to expect with this gun

[McCoytheGreater]

You definitely need more than one spark gap for that chamber.

Mike from UltimateSpudgun has a theory that I want to experiment with. He claims it works on larger spudguns (like this one and our ME1-05H). Put the spark gap at the very back. This will cause two pressure waves, right? Right. as the pressure wave moves forward toward the barrel the gasses compress creating a quasi-hybrid effect which detonates the gas. I haven't tested it on our gun, but as soon as I can I will. Remember, this is for large/long chambered guns...like yours. have fun. Looks good! I'm really digging the ABS. Are you going to make a shroud for the MAPP tank...you know...just for aesthetic purposes? that would be cool.

[vblock]

well im not shure actuly im not a fan of the shrouds not shure why . do you think i should paint it ?. and yeah i have only shot it twice at about -30 outisde i noticed it was very quite when it shot and the potatos didnt go more them 150 yards

[Insomniac]

If you continue running that sparker at twice it's rated voltage, chances are it won't last too long. I'd reccommend that you go back to 1 AA, as it should only require one spark to ignite anyway. Depending on the circuit, if you put the 2 AA's in parallel you may get a slightly higher spark rate as they will be able to deliver more current and this should be safer than running it at a higher voltage.

[Moonbogg]

maybe the barrel connections are causing the spuds to split.

[vblock]

that could be. im not very shure but i dont think i can afford another one for awhile . the barrels touch almost perfectley tho

[CpTn_lAw]

You definitely need more than one spark gap for that chamber.

Mike from UltimateSpudgun has a theory that I want to experiment with. He claims it works on larger spudguns (like this one and our ME1-05H). Put the spark gap at the very back. This will cause two pressure waves, right? Right. as the pressure wave moves forward toward the barrel the gasses compress creating a quasi-hybrid effect WHICH DETONATES THE GAS . I haven't tested it on our gun, but as soon as I can I will. Remember, this is for large/long chambered guns...like yours. have fun. Looks good! I'm really digging the ABS. Are you going to make a shroud for the MAPP tank...you know...just for aesthetic purposes? that would be cool.

I'm not sure You actually wanna detonate a gas, that is unless your cannon is stainless steel, with 1" wall thickness. The detonation in a chamber is not dangerous by the pressure itself, it's the rapid spike that makes it not suitable at all.
Plus, what you're telling here sounds a bit like a light-gas gun. The piston being the pressure wave at the back. Again, you're not going to get that much power. The excess you might get would result from a (maybe) better burn of the gas mixutre.

[vblock]

haha i just realized the battery pack was still gettin held on with the maskin tape waitin for the epoxy to dry

[vblock]

how do i put up a preview ?? sorry im not good with computers