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full auto

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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full auto

Unread postAuthor: jean » Tue Jun 11, 2013 12:33 pm

here the concept

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Unread postAuthor: finland66 » Tue Jun 11, 2013 1:24 pm

Looking nice but I don't get it (I'm stupid I know)
I like that it is complex. Mayby hard to do
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Unread postAuthor: jean » Tue Jun 11, 2013 1:45 pm

think about it! it isn't so hard.




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Unread postAuthor: finland66 » Tue Jun 11, 2013 11:54 pm

jean wrote:think about it! it isn't so hard.


Thinking isnt hard, but understanding is hard

I think it over night and understanted part of it.
But how you thought to make air thigh magasize or burst disk for full auto?
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 12, 2013 12:00 am

Why not have a premixed bottle of fuel and air and feed from that instead of going through all these complications to mix it in situ.
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Unread postAuthor: jean » Wed Jun 12, 2013 7:07 am

@finland66 there is no burst disk or airtight magazine necessary maybe a blow forward bolt or something like this is adequate.

@jsr i know what you mean but it isn`t practical for higher chamber volumes and the most important is my proclivity to make complicated things easier or to figure out what is nessecary to make this thing buildable without changing the whole concept.
you are one of the persons from wich i need help to improve the concept into a easier to build version ;)

...and a pistol without bulky tanks an so on... isn`t is a nice imagination^^


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Unread postAuthor: finland66 » Wed Jun 12, 2013 8:13 am

@jean still you need air thigh blow forward bolt, but it isnt a problem.
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Unread postAuthor: jean » Wed Jun 12, 2013 9:20 am

no need for airtight

it is hard for me to explain

while the combustion happens the green piston moves back ....pressure extends to the barrel and drop down...the yellow piston start to move from left to right, vent the chamber and sucks new air/fuel behind it... (this is the moment the drawing show us)....than the green piston loss his velocity and moves back against the yellow piston, push it back to left and the fuel/air mix can reach the other site of the yellow piston. the piston strikes the fuel meter...ignition..

i hope you can understand it

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Unread postAuthor: finland66 » Wed Jun 12, 2013 10:45 am

Aaaa i get it :idea: . You explained it well, but how the mixture on left side the yellow piston get on the right side of yellow piston to ignit mayby check valve on piston.
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Unread postAuthor: jean » Wed Jun 12, 2013 11:19 am

the red cup shape works like a pump head / check valve

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Unread postAuthor: jean » Mon Jun 24, 2013 8:48 am

mh not even one comment to improve the design
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Unread postAuthor: Blitz » Tue Jun 25, 2013 2:32 am

Well, have you tried it yet? I can't really give much input without some results on your current design.
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Unread postAuthor: jean » Tue Jun 25, 2013 9:12 am

well this is the fundamental concept but there are some problems to solve before start to build it. this design is relative complex and need some skills and tools to build. the goal is to make it buildable with tools in the basement. (no lathe or extraordinary machine skills)


-will it work?
- is there any way to reduce the numbers of o-rings?
- any way to make the fuel meter more simple
- may an other configuration of the components
- make it serviceable..

what ever... i need suggestions
at the moment i cant build this thing because there are to many problems in fabricating the components... example: is it possible to make the fuel meter absolutely air/gas tight? or is there an other way to meter without the need of absolutely air tight.

if the topic is a little bit more complex you get only a few comments.... what?
i am restricted in my language skills to argument in a detailed way sorry

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Unread postAuthor: jackssmirkingrevenge » Wed Jun 26, 2013 5:17 am

Have you looked at the Tippman C3?

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Unread postAuthor: jean » Wed Jun 26, 2013 8:55 am

hi jack
yes i saw the c3
but it isnt a full auto and you have to cock every shot...
there are serval design that work like the c3.
may it can work as auto but i see no way to not cock the cannon after every shot. not yet..

my previous post seems a little bitter.. sorry

there are serval points to figure out but i cant do it alone

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