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Iteresting new QDV variant on youtube

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Iteresting new QDV variant on youtube

Unread postAuthor: Technician1002 » Sat May 14, 2011 11:35 am

I was checking my youtube channel and noted another QDV animation in the related videos. It is a bolt action QDV with a spring to pull it open (the spring isn't shown). It lacks a bumper though.

I like the animation. It shows the action of the piston and projectile as the valve cracks open.

With a little variation this could be adapted to make a breech loading bolt action cannon.
[youtube]http://www.youtube.com/watch?v=M8Hvz4h6Fek&NR[/youtube]
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Unread postAuthor: LovableAirGuns » Sat May 14, 2011 11:47 am

Thats a pretty good idea I think you should make it. ;)
It would be alot more realistic and it would have great performance
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Unread postAuthor: POLAND_SPUD » Sat May 14, 2011 4:24 pm

not new... wrote about it a few month ago and that one is breech loaded
EDIT
sry I meant mine is breech loaded
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Last edited by POLAND_SPUD on Sat May 14, 2011 6:00 pm, edited 1 time in total.
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Unread postAuthor: Lockednloaded » Sat May 14, 2011 4:42 pm

How is the QDV opened if it is a balanced valve?
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Unread postAuthor: Technician1002 » Sat May 14, 2011 5:41 pm

It is pulled open. The spring between the bolt and spool is not shown.
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Unread postAuthor: shardbearer » Sat May 14, 2011 7:54 pm

Eh. Seems complicated with not much benefit.

To those confused, it is an extension spring not compression behind the piston.
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Unread postAuthor: High-PSI » Sat May 14, 2011 8:51 pm

How about making the projectile the piston (obviously reversed direction). That would be even simpler. :)

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Unread postAuthor: Technician1002 » Sat May 14, 2011 9:28 pm

I accidently did that once with my ABS cannon. It was leaking. I tried to move the piston just a little to try to get a better seal and pushed it too far in.. The pressure was low, but the piston still made good distance.
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Unread postAuthor: shardbearer » Sat May 14, 2011 10:17 pm

The problem with that is the difficulty of making a piston. Would be solved by putting the o rings on the gun instead of the piston. Then could use something like a piece of PVC pipe as the piston.
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Unread postAuthor: jackssmirkingrevenge » Sun May 15, 2011 1:27 am

High-PSI wrote:How about making the projectile the piston (obviously reversed direction). That would be even simpler. :)


I've been banging on about that for years ;)

Image

On another note, I hear rumours of a spring-loaded QDV concept that might be published soon ;)
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Unread postAuthor: al-xg » Sun May 15, 2011 5:22 am

"We fire the WHOLE bullet !" ;)
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Unread postAuthor: Zeus » Sun May 15, 2011 5:50 am

Image

Taken from the launcher design thread.

And yes, this post was pointless.

Edit: note 6 cases already ejected, yet the magazine is still more or less full?
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Unread postAuthor: jackssmirkingrevenge » Sun May 15, 2011 6:37 am

al-xg wrote:"We fire the WHOLE bullet"


That's 65% more bullet PER BULLET :D

Zeus, I don't think even the caseless G11 had that cyclic rate :shock: maybe the Metal Storm stuff might come close.
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Unread postAuthor: High-PSI » Sun May 15, 2011 7:34 am

jackssmirkingrevenge wrote:
High-PSI wrote:How about making the projectile the piston (obviously reversed direction). That would be even simpler. :)


I've been banging on about that for years ;)

Image

On another note, I hear rumours of a spring-loaded QDV concept that might be published soon ;)


Cool. I have wondered why no-one has done that as of yet.

Hmm, it must be that since I can machine my own parts, making custom projectiles is no big deal.........

I like the O-rings in the barrel idea.

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