Posted by: Dave Hall on May 02, 2003 at 16:44:05

: Low velocity shot sounds like a CO2 air horn. Very loud and LONG occuring during firing. Produces a lame 145 fps. The diaphragm is occilating I assume? OK, I see in your other thread that you are shooting nerfs. I believe what is happening is this: The nerf is 'sticking' in the barrel a bit (foam rubber has a pretty high friction coef!). When this happens the back pressure on your valve increases and the valve starts to close. About this time the nerf breaks loose and starts moving again. The pressure drops and the valve begins to open again. Now the nerf gets hung a bit... Voila, pressure oscillations galore! Note that I had this problem with LCT's new toy (sorry, LCT), but I have totally solved it with a bit of nothing more exotic than masking tape. Wrap a single layer of masking tape around the nerf where it rides against the barrel. The tape provides a much slicker surface on which the nerf can slide through the barrel rather than bind up. That's it. As a point of data, LCT's little toys did the binding thing about 80% of the time before I moved to the tape. It hasn't happened so much as once since.

Follow Ups: I think both of you guys NAILED IT! Dale "Head_Hunters" DuPont 00:11:33 05/03/03 (5) Re: Another thing to try... Dave Hall 01:32:11 05/03/03 (4) Re: Already set up that way Dale "Head_Hunters" DuPont 09:36:59 05/04/03 (3) Re: Already set up that way Michael "LCT_Paintball" Lyon 11:54:53 05/04/03 (2) You think that is enough port area? Dale "Head_Hunters" DuPont 12:15:25 05/05/03 (1) Re: You think that is enough port area? Michael "LCT_Paintball" Lyon 13:20:38 05/05/03 (0) Post a Followup Show your name as: DefaultRealnameBothNickname E-Mail address (eg: joeschmoe@aol.com): Show your e-mail address? DefaultYesNo Your Password: Don't have a password? CLICK HERE - Forgot your password? CLICK HERE Subject: Subject:Message: : : Low velocity shot sounds like a CO2 air horn. Very loud and LONG occuring during firing. Produces a lame 145 fps. The diaphragm is occilating I assume? : OK, I see in your other thread that you are shooting nerfs. I believe what is happening is this: The nerf is 'sticking' in the barrel a bit (foam rubber has a pretty high friction coef!). When this happens the back pressure on your valve increases and the valve starts to close. About this time the nerf breaks loose and starts moving again. The pressure drops and the valve begins to open again. Now the nerf gets hung a bit... : Voila, pressure oscillations galore! : Note that I had this problem with LCT's new toy (sorry, LCT), but I have totally solved it with a bit of nothing more exotic than masking tape. : Wrap a single layer of masking tape around the nerf where it rides against the barrel. The tape provides a much slicker surface on which the nerf can slide through the barrel rather than bind up. : That's it. : As a point of data, LCT's little toys did the binding thing about 80% of the time before I moved to the tape. It hasn't happened so much as once since. [ Follow Ups ] [ Post Followup ] [ WARPIG Tank Talk ]