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Posted: Fri Jan 13, 2012 3:51 am
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You could still use a straight pump, but make the piston smaller diameter. Think shock pumps, they have a much smaller diameter than a tyre pump but can get higher pressures with the same effort.jmez1996 wrote:The main task would be sorting out a pump that works on that mechanism to get more leverage over a straight pump.
Just like any pneumatic, but with a relatively small chamber (1:1 ratio should be more than enough for a high pressure launcher) and a pump fitted.How would this go with a QEV instead of a hammer valve?
BOOOOOO!Brian the brain wrote:After JSR has so gracefully convinced you NOT to try a springer I feel obliged to complete the pro/con story .
True... but you need one heck of a spring before this becomes an advantage.1: As a springer is fired it compresses air.This produces the air to heat up, wich can yield higher muzzle velocities than a PCP pneumatic could because in a PCP the reverse takes place.Stored air expands and cools.
Hot air can move faster than cooled air.
... as does wildly inconsistent velocity, and the possibility of destroying the thing from too much fuel...2: based on the workings above, a springer can be used to ignite fuel in the chamber known as dieseling.This will create even hotter gasses and more volume of it.
Supersonic velocities just became the norm.
... so the point still stands.The principle is nothing to sneeze at, but indeed building one requires skill, specific tools and suitable materials.
That is why it is out of the newbie realm.
I'd be interested to see if any of my proposed changes to the traditional ones will improve it...That being said, I eagerly look forward to seeing a "rough" gas ram from your stable
Brian the brain wrote:Anyway...just learned about a coaxial-built in pump airgun made by Bate in the Girandoni era...
that kinda distracts me at the moment...wish I could find more about it..

Oh ye of little faith... things are moving behind the scenes, more in futureBrian the brain wrote:Not that I would ever win a battle of wits with you...![]()
I can always end it by asking why you're not building something spectacular now you no longer have an excuse
..