Posted: Wed Apr 21, 2010 7:39 am
Nice 
... but at the same time, you're losing air pressure because of air leaking into the magazine before the bolt is fully closed...c11man wrote:i saved some preformace lose do to chocked flow.
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Posted: Wed Apr 21, 2010 7:43 am
Posted: Wed Apr 21, 2010 9:43 pm
shit happens, its still plenty powerfuljackssmirkingrevenge wrote:... but at the same time, you're losing air pressure because of air leaking into the magazine before the bolt is fully closed...c11man wrote:i saved some preformace lose do to chocked flow.
video has been added to the original post enjoy!
Posted: Thu Apr 22, 2010 12:55 am
WHoa, thats impressive. Excellent job!
Posted: Thu Apr 22, 2010 2:49 am
So I can see, good stuffc11man wrote:crap happens, its still plenty powerful
Posted: Thu Apr 22, 2010 7:00 am
thanks you guys
and i didnt realize the door would be such an easy target so this weekend i will make a longer vid (properly edited this time) shooting at some 3/4in plywood or similar
and i didnt realize the door would be such an easy target so this weekend i will make a longer vid (properly edited this time) shooting at some 3/4in plywood or similar
Posted: Thu Apr 22, 2010 7:34 am
Well now after seeing that video I may just stumble back into trying to make a semi again. Might stay low calibur though. Who knows... 
I still think you could cut a foot off of your chamber. I feel as though since you have such an effective bolt, that you should further optimize this for conservation or time and air.
I still think you could cut a foot off of your chamber. I feel as though since you have such an effective bolt, that you should further optimize this for conservation or time and air.
Posted: Thu Apr 22, 2010 9:10 am
Awesome!!! I love the bolt design, I may have to consider attempting something like this on a smaller scale.
Posted: Thu Apr 22, 2010 9:21 am
Nice. About the only comment I could make is you may consider adding a detent to keep some of the balls from rolling out the barrel.
Posted: Thu Apr 22, 2010 1:50 pm
Hubb I was meaning to ask you, does an o-ring detent in ANY WAY OR AMOUNT effect the performance? I want to put one on my GB piston valve cannon, but I'm not sure if it will harm performace.
Posted: Thu Apr 22, 2010 2:59 pm
Assuming the air has nowhere else to go, a detent will actually increase performance, because it gives the valve more time to open and more pressure buildup behind the projectile before it starts to move. A properly engineered detent can be used on a valveless launcher that would have better performance than a burst diskGun Freak wrote:Hubb I was meaning to ask you, does an o-ring detent in ANY WAY OR AMOUNT effect the performance? I want to put one on my GB piston valve cannon, but I'm not sure if it will harm performace.
Posted: Thu Apr 22, 2010 3:03 pm
If anything, it would probably help performance, although it probably wouldn't be noticed with electronics. The detent would hold the round just a little bit longer and will build pressure behind the round before it releases.
I think JSR used this concept in one of his builds...
Edit: Okay, apparently I was too late in my response, but I figured he would have provided the link to one...which he did.
I think JSR used this concept in one of his builds...
Edit: Okay, apparently I was too late in my response, but I figured he would have provided the link to one...which he did.
Posted: Thu Apr 22, 2010 3:04 pm
Just oneHubb wrote:I think JSR used this concept in one of his builds...
A good thread on the subject
Posted: Thu Apr 22, 2010 3:33 pm
it does have a detent but some of the balls are undersized and fell through. so i sorted them and no longer have the problem seen in the video
Posted: Sat Apr 24, 2010 2:43 pm
did i really have to bump this? well anyway i made a new video of it against some much harder target. its on the top of the original post