Find contentProblem being addressed: the fact that most homemades (belt, breach, or clip-fed) fail to maximize the ROF.
That is to say, while Boltsniper's (SCAR-N) claims a Max ROF of 150s/min, (which would be more than awesome) it does not seem that even with such quality, anything resembling a burst-fire or semi-auto trigger system has been implemented. The (SCAR-N)'s theoretical ROF, if I'm reading this correctly, is FAR (hahaha) greater than it's experimental ROF. Furthermore, it seems that no kind of an electrical system has ever been built to enable a semi-auto or burst-fire mode. If I am wrong, shoot me down and make a writeup; otherwise, here's my proposition: I am in the process of developing this (hence no pics), it's taking longer than I'd thought (due to budget and some unforseen problems in the circuit design) and thought I would throw down my cards as a preface to my writeup to see 1) if this has been done, and 2) if there is a simpler method that I have not yet read about.
I have seen several examples of what CAN be done with a sprinkler valve... or any solenoid for that matter... but why not hook the solenoid up to the core circuit foind in a frequency generator and use this, powered by 3 rechargeable 9-volt batteries, to generate a VERY precise mechanismto pulse air at a given rate. It seems advantageous to use the pressurized air blast to re-cock the bolt as well as fire the gun. In actuality, any firing mechanism which relies on air pressure to re-load and re-cock the gun would work...
http://science.howst...-gun1.htm<br />
and
http://science.howst...-gun2.htm<br />
have some great flash media dEffeminateting several of these mechanisms.
Once the firing rate can be controlled by an electronic signal, and thereby manipulated, there's no reason you couldn't design a system which allows the user to experimentally determine and pre-set their gun's max ROF. Then, using this as the wavelength for (optimally) a square-wave function, have a simple switching mechanism to switch between say 3-modes which I would find useful:
semi-automatic, 3-round burst, and single shot.
I can't get over the apparent fact that nobody has tried this yet... how freakin' SWEET would that be? to be able to throw a switch on the side of the gun and not only know that you are firing as fast as the gun will allow, but be able to switch firing modes like that? If we have any other Physics Majors or EE Majors here, speak up! I could use someone to bounce circuit design off of.
I'm busy the rest of this week but will get back to it this weekend and try to show you old pros what I have so far... even if it's just a bunch of wires and a valve. I can borrow my friend's webcam so expect some powning video quality (that was sarcastic)... I'm taking suggestions for a soundtrack as well
-co
