Search found 526 matches

by mega_swordman
Sun Apr 11, 2010 1:46 pm
Forum: Pneumatic Cannons
Topic: I has 6mm carbine
Replies: 15
Views: 1931

Looks like we need an account to see it. =/
by mega_swordman
Tue Feb 02, 2010 3:50 pm
Forum: Pneumatic Cannons
Topic: Educate Me: Why wouldn't you use a QEV?
Replies: 17
Views: 1267

Availability would be why in my case. I can go to any hardware store and by a 1" Sprinkler Valve whereas the only practical QEV I can find would need to be shipped from the UK.
by mega_swordman
Sat Jan 16, 2010 4:33 am
Forum: Pneumatic Cannons
Topic: preloaded pneumatic cartridge
Replies: 331
Views: 54512

I don’t know how much abuse the Schrader valve can take, maybe you should try and make a valve which can take alot more Although plausible, the problem I see would be keeping the homemade schrader down to the same size and still function as well as the original. It is possible, but it would be a ta...
by mega_swordman
Fri Jan 15, 2010 5:21 pm
Forum: Pneumatic Cannons
Topic: preloaded pneumatic cartridge
Replies: 331
Views: 54512

Do you know how much pressure the cartridge can hold? and how's the size compared to your original design?
by mega_swordman
Sun Jan 10, 2010 9:47 pm
Forum: Pneumatic Cannons
Topic: preloaded pneumatic cartridge
Replies: 331
Views: 54512

In the proposed system, it looks as though the trigger has to be reset every single time you fire. Are there any plans on designing the trigger to reset itself so all you have to do is pull the trigger?
by mega_swordman
Sun Aug 16, 2009 5:32 pm
Forum: Off-Topic Hobbies
Topic: The Slingshot Channel Thread
Replies: 1168
Views: 59563

Very nice. One question though, when you are pulling back on any given band(?), do you have any problems with the rotation mechanism wanting to rotate? Do you think it would be worth trying to have a locking mechanism to lock the barrel?
by mega_swordman
Sun Jul 12, 2009 1:12 pm
Forum: General How-To & Discussion
Topic: Best way to convert this to a cartridge mechanism?
Replies: 9
Views: 1710

I'm still a bit fuzzy on the details here. You say the valve is actuated by the valve stem. In your diagram, would that be the golden piece on the bottom or the red piece to the left? Also, it looks as though the valve itself could be used for a cartridge if it were modified to be pressurized before...
by mega_swordman
Wed Jul 08, 2009 12:21 pm
Forum: General How-To & Discussion
Topic: Automatic valve for nerf rifle
Replies: 5
Views: 1921

My concern here is the spring closing the chamber. It seems as though you are assuming the spring will remain open when there is no pressure acting against it but it will close when there is a full chamber of pressure. Could you clarify this for me?
by mega_swordman
Wed Jun 17, 2009 4:09 pm
Forum: SpudFiles Discussion
Topic: Cannon Hall of fame
Replies: 7
Views: 720

Interesting, but I don't think it would work out. This is in some ways accomplished by the competitions as well, so to some degree the winners of the competitions are in the "Hall of Fame".
by mega_swordman
Tue May 05, 2009 8:19 pm
Forum: Hybrid Cannons
Topic: Converting a pneumatic into hybrid using shock heating
Replies: 23
Views: 1793

I don't think the energy created in the rapid compression would be dense enough to cause an ignition. Much like the problems with spark gaps, the energy needs to be concentrated in a very small area in order to ignite propane, especially with higher mixes.
by mega_swordman
Thu Apr 23, 2009 11:37 pm
Forum: Hybrid Cannons
Topic: Hybrid Equations
Replies: 10
Views: 843

Thank you Jimmy for your contribution, this is exactly the kind of informatio I was looking for. You're a lifesaver.
by mega_swordman
Thu Apr 23, 2009 2:29 am
Forum: Hybrid Cannons
Topic: Hybrid Equations
Replies: 10
Views: 843

Thanks for the information Have you loaded up HDGT ....? It can answer much of what you are look for. I would like to make a presentation on hybrid cannons, so given the resources, I would like to be able to explain the science and the formulas behind it. It is a very handy to have HDGT around thoug...
by mega_swordman
Wed Apr 22, 2009 11:43 pm
Forum: Hybrid Cannons
Topic: Hybrid Equations
Replies: 10
Views: 843

Hybrid Equations

So I have been doing my homework, but there are some things in Hybrid cannon design that I cannot seem to find. Could someone kindly provide the equations and/or explanation as how to find: The amount of energy required to ignite propane at different mixes. -and- The amount of energy produced by the...
by mega_swordman
Tue Apr 21, 2009 12:59 am
Forum: General How-To & Discussion
Topic: PCP 6 shooter
Replies: 7
Views: 718

An interesting endeavor. My only concern would be the triggering mechanism. Since you mentioned six chambers, I assume you will release this though some type of valve. Care to share your thoughts on this?

Also, with the chambers be stationary, or will the move about an axis to the firing mechanism?
by mega_swordman
Sun Apr 19, 2009 10:19 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Rattlesnake V3 - HPA auto valve
Replies: 105
Views: 21713

I am just going by ear here, but it sounds like it drastically looses power as the tank pressure decreases (as it very well should). Any theories yet on how to combat this? Also, looking at the first picture, is this actually valve #5? Those valves in the picture look nothing like the ones in the ot...