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bolt actions

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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bolt actions

Unread postAuthor: Major Collins » Tue Dec 20, 2011 7:25 am

how do bolt actions on airguns work?
when you use the bolt to push the ammo forward (assuming the bolt is solid) no air can get behind the projectile in order to get it moving.
i cant seem to figure it out...
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 20, 2011 8:05 am

You can have a conical bolt face with a stem:

Image

Image

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Unread postAuthor: Major Collins » Tue Dec 20, 2011 8:16 am

ive thought about this idea... but on larger scale wont the air flow be terrible and if the hole is too big the ammo will fall through?
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 20, 2011 8:20 am

Um...if your projectile is 0.500", make the hole 0.499" - the projectile won't fall though and there will be no appreciable difference in airflow.

You could also have say a 0.75" hole and just put a single thin wire rod across it...
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Unread postAuthor: Major Collins » Tue Dec 20, 2011 8:25 am

jackssmirkingrevenge wrote:Um...if your projectile is 0.500", make the hole 0.499"
talk about precision, i guess that makes sense now thank you JSR for clearing it up.
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 20, 2011 3:26 pm

On another note, looking at the Crosman 1337 diagram - damn that's poor design in terms of efficiency!
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