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Piston material

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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Unread postAuthor: Gippeto » Sat Dec 13, 2008 4:48 pm

Assemble in this order (front to back);

Nut, washer, rubber sealing face, wood disk, washer, nut, (length of rod), nut, washer, rubber disk, wood disk, washer, nut.

The front is the sealing or barrel side. The washer should fit inside your barrel.

I'll leave off the nuts. The washers are in red.
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Unread postAuthor: jitup » Sat Dec 13, 2008 4:54 pm

Thank you.
Man you beat me :cry:
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Unread postAuthor: MrCrowley » Sat Dec 13, 2008 5:18 pm

psycix wrote:
but I made a new one out of a solid wood so I could add an o-ring.
*cough* mass *cough* heavy chgrmm*

I think it was clide who said that unless your piston is really heavy, weight doesn't effect opening time too much.
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Unread postAuthor: Ragnarok » Sat Dec 13, 2008 5:24 pm

MrCrowley wrote:I think it was clide who said that unless your piston is really heavy, weight doesn't effect opening time too much.

I've said that a few times as well.

I could effectively halve the mass of the pistons I currently use and see no discernible performance improvement. I'd struggle to spot the difference if I had a chrony to be frank. However my pistons aren't exactly hugely heavy in the first place.

Doesn't mean that heavy pistons should be ignored though. It's still a good idea to keep the weight down as much as possible.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: ALIHISGREAT » Sun Dec 14, 2008 5:10 am

Piston weight may not affect opening time... but a heavier piston has more momentum... so keeping weight to a minimum is generally a good idea to reduce the chance of damage to a cannon, especially PVC ones.
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