Pretty much, if you're only doing single shots you don't need a slide valve.Ianbuckwell wrote:let say for example i want a single shot firer, am i correct in thinking that if a slide valve was used as a trigger, in one position it allows pressurized air to pass into the gun, then once the pressure equalised it was ready for firing. Sliding the valve to the second position blocks the pressurized air in the gun allowing no more to pass. the qev activates and empties the gun using only what ever is in the gun, the gun would only refill once the slide valve is put back. I am sure I have seen a few guns with no tank just the tubular frame for air storage? Is that correct or am i completely off track? If no reserve tank is used I assume it is critical to measure or calculate the fun volume?
Download GGDT to simulate the performance of your launcher: http://www.thehalls-in-bfe.com/GGDT/
You should match the valve size to your barrel diameter.One other thing for an 'average' gun and qev is a 1/8" valve sufficient, just looking at prices and soon as size of parts goes up so does the price often disproportionately (sp.) I need to keep this cheap and simple for my first effort, don't want to run before i can crawl
Nope, those pumps are rubbish.on abay i have seen little compressor/tyre pumps it is about £7/10USD saying it will do 300psi do you thinking it really does this? Maybe it can for short periods of time which is all i am going to need.
You're better off buying one of these:
Here's a rough simulation with a 2 foot 3/4" chamber and 3 foot 1/2" barrel, firing a half inch steel ball bearing at 240 psi.
You're at over 60 ft-lbs, more than 5 times the 12 ft-lbs legal limit for an unlicensed air rifle in the UK...