Kartoffele KannoneV3.0- Update: New rifled barrel w. dmg pic

[SnowFlox]

Well im back from vacation, got bored so i wanted to shoot some patato's with my older cannon.

But it diddnt work no sparks..

I diddnt want to figure out whats wrong. so i got to the local hardware shop to buy parts for a bigger on.

Its not a beautiful one, but it shoots patato's


Sorry for the blurry picture but you get the idea how long it is.



Little MSI NorthBridge cooler( to small need biger one ) placed on two screws.
And wired the the screws for the power.






Tested it today and it fires nice but the older one works again.. dont know how.. but now i have 3 working ones

the whole family ! Dad mom and a child

[spud yeti]

Very nice! I love the whole happy family vibes 8)
They all look really cool, but holy wack thats one long barrel!
BTW, how was your vacation?

[SnowFlox]

Barrel is indeed very long, but a shorter one from my older one isnt more powerfull

Had a great vacation

[spud yeti]

Thats good to hear. So when is it pneumatic time?

[SnowFlox]

lol ! i was just thinking about it to build a pneumatic one.

you could have been my brother.. not only the same thoughts but like jimi hendrix as well

simple one with bibycle pump. instead of 19mm barrel i use on my 2 bigger combustions, use 16mm barrel (that i use on the smallest )

why 16mm ? those little yellow hearing protection things fits perfect in 16mm barrel.

[spud yeti]

Hahaha, we are long-lost brothers!
I really like the sound of that pneumatic, what valve were you thinking of?

[SnowFlox]

just thinking of a simpel ball valve first.

[spud yeti]

Hmmm, yeah, they nice to start off with, but not the greatest in performance. I think you have the skill to build a piston/diaphram valve gun that works really well. Look under "Pneumatic cannon discussion" and in the sticky theres a thread "Piston valves explained visualy" by Clide. Look at that to understand piston valves.

[SnowFlox]

Well i know how a screwdriver works
Thanks ! i will have a look at it by tomorrow !

[spud yeti]

Haha, you'd be suprised! Some people dont have the logic, common sense, skills or any other ounce of mechanical knowledge in them to build one!

[dauphinoise potato]

AAah nice family of improvised starch produce accelerators Is the ratio ok for the one you just built?

[SnowFlox]

Yeah its fine as i said, when i try a shorter one.. it decreased performance.

this long barrel was even longer ! but i cut a piece off, and this size is just perfect

[SnowFlox]

Because of the bigger combustion chamber this time, i bought a other barrel.

This one is about 80cm long and has an inside diameter of 26mm. so that 10mm more then his first barrel.

when i got the barrel ready, i did a test shot to an big plastic bucket.
WOW what a force !! much more then the smaller 16mm barrel !

I dont know how far the patato will go with this bigger barrel, but the damage is very big ! I shot it once.. it scares me the crap out of me

The two barrels




The damage shots of both barrels




edit...

and now... my barrel is rifled to

[VH_man]

how did you rifle your barrel? if i may ask.....

[Carlman]

probobly the ye old nails and dowel method??, thats what im doin 2 some poly pipe soon for my pneumatic. Nice family by the way!