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piston questions

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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piston questions

Unread postAuthor: jr » Mon Jun 23, 2008 1:18 am

How far will the piston travel once the pilot is dumped?

and at what point of travel is the majority of the psi gone from the chamber?




I'm an idiot.... can someone please move this to the pneumatic discussion for me.
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Last edited by jr on Mon Jun 23, 2008 1:22 am, edited 1 time in total.
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Re: piston questions

Unread postAuthor: MrCrowley » Mon Jun 23, 2008 1:22 am

jr wrote:How far will the piston travel once the pilot is dumped?

and at what point of travel is the majority of the psi gone from the chamber?

Well in a frictionless enviroment, the piston will keep going.

It will go until it is told to stop by something we like to call 'the bumper'. :roll:

For the second question, probably when the piston has travelled half way.
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Re: piston questions

Unread postAuthor: jackssmirkingrevenge » Mon Jun 23, 2008 1:26 am

jr wrote:How far will the piston travel once the pilot is dumped?

and at what point of travel is the majority of the psi gone from the chamber?


There are too many variables to give you an answer - it depends on how big your chamber is, how heavy and tight your piston is, what psi you're using and how good your pilot valve is.
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Unread postAuthor: jr » Mon Jun 23, 2008 1:28 am

so any time after the half-way point I can stop the piston travel? Do all those veriables realy affect the distance a piston travels and how soon it can be stopped and returned..I know that the pilot volume will have an affect on the travel speed.. and that was the next big question.
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Last edited by jr on Mon Jun 23, 2008 1:40 am, edited 1 time in total.
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Unread postAuthor: MrCrowley » Mon Jun 23, 2008 1:30 am

No.... You find the optimum piston travel and let the piston travel that far.

There is no 'halfway' point in a piston. EVERY PISTON IS DIFFERENT IN THEIR OWN UNIQUE WAY. NO PISTON IS THE SAME. :roll:


I suggest you do a lot more research. No offence.
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 23, 2008 1:40 am

For the record, your piston only needs to travel between 25 to 50% of the barrel diameter for maximum efficiency.

Here's some theory for you to contemplate ;)
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