Jump to content


Photo

C.V.A.S.P.

Constant Volume Airgun, "Single Pump"

12 replies to this topic

#1 mysterio

mysterio

    Member

  • Members
  • 249 posts

Posted 30 July 2013 - 11:54 PM

First off, an overview of what the blaster looks like.

Posted Image

Posted Image

This design is similar to most homemade airguns, and as such, the firing mech can be replaced with whichever sort of release mechanism desired, PVAT, Ball valve, WNTS, etc. Anything that isn't backpressure.

It works much like Kane's 7-11, compressing air "in the pump", and does not have a secondary tank that stores pressure.

The front nodule is the trigger, and is connected to the backwards check valve in the pump via steel rod. Depressing the front button is how you fire the blaster.

Posted Image

A visualization of how the blaster works. "Snapshot" taken at moment of firing, red is pressurized.



Materials
2" PVC
Caulk gun [large]
2" piston cup 9411K14 [Can be substituted with anything that has a 100% seal]
Firing mech of some kind [I used a check valve system]
2" to 3/4" PVC reducer bushing
3/4" PVC
Washers, nuts, and bolts.



Posted Image

Pic of the piston cup

The main body is just a piece of 2" pvc and the bushing couplered together.

If you havent noticed yet, I forgot to take pictures during assembly, but the whole thing is pretty simple.

Questions/Comments/Flames appreciated.
  • 0

If two powerful is a problem then just go with one powerful. I guess this style of hopper will work even beyond three powerful..


15:46 *** Buff is now known as TheGdiddler
15:51 TheGdiddler I'M GONNA GRAPE YOU"

#2 proplus

proplus

    Member

  • Members
  • 85 posts

Posted 31 July 2013 - 12:09 AM

Wow,

Probably the most innovative thing i've seen in nerfhaven lately.

Does the trigger seal well?

How far can you the plunger down?

Edited by proplus, 31 July 2013 - 12:10 AM.

  • 0
"the peinus itself is a handle"

- Kane the medeocre

#3 mysterio

mysterio

    Member

  • Members
  • 249 posts

Posted 31 July 2013 - 12:14 AM

Wow,

Probibly the most innovative thing i've seen i nerfhaven lately.

Does the trigger seal well?

How far can you the plunger down?


Thanks.

The trigger seals well due to the fact that its a check valve cut in half.

The plunger goes as far as the tube, although I set a cap on distance with e-tape so I wouldn't go too far/tire my arm out.

Posted Image
  • 0

If two powerful is a problem then just go with one powerful. I guess this style of hopper will work even beyond three powerful..


15:46 *** Buff is now known as TheGdiddler
15:51 TheGdiddler I'M GONNA GRAPE YOU"

#4 azrael

azrael

    Member

  • Members
  • 393 posts

Posted 31 July 2013 - 01:23 AM

Very cool, always cool to see something different, I'd love to see a demo video.
  • 0
Better Nerf By Science!
http://nerfscience.blogspot.com/

#5 mysterio

mysterio

    Member

  • Members
  • 249 posts

Posted 31 July 2013 - 01:35 AM

Very cool, always cool to see something different, I'd love to see a demo video.


That's on its way, but KoRnEd is too busy playing League of Legends to upload it.
  • 0

If two powerful is a problem then just go with one powerful. I guess this style of hopper will work even beyond three powerful..


15:46 *** Buff is now known as TheGdiddler
15:51 TheGdiddler I'M GONNA GRAPE YOU"

#6 azrael

azrael

    Member

  • Members
  • 393 posts

Posted 31 July 2013 - 01:58 AM

Hah, I hear that. infamous and I never get anything done as a result of LoL.

Also, I'll be that guy: approximate ranges?

Edited by azrael, 31 July 2013 - 01:58 AM.

  • 0
Better Nerf By Science!
http://nerfscience.blogspot.com/

#7 mysterio

mysterio

    Member

  • Members
  • 249 posts

Posted 31 July 2013 - 02:06 AM

Hah, I hear that. infamous and I never get anything done as a result of LoL.

Also, I'll be that guy: approximate ranges?


They actually got measured during the videos, 100+ with darts, 40-ish with Drac rockets.
  • 0

If two powerful is a problem then just go with one powerful. I guess this style of hopper will work even beyond three powerful..


15:46 *** Buff is now known as TheGdiddler
15:51 TheGdiddler I'M GONNA GRAPE YOU"

#8 DartSlinger

DartSlinger

    Member

  • Members
  • 222 posts

Posted 31 July 2013 - 11:35 AM

Am I correct in assuming that this has a rate of fire of about one shot every six seconds? You have to squeeze the caulk handle about fifteen times before you can fire it, right?
  • 0

#9 mysterio

mysterio

    Member

  • Members
  • 249 posts

Posted 31 July 2013 - 03:23 PM

Am I correct in assuming that this has a rate of fire of about one shot every six seconds? You have to squeeze the caulk handle about fifteen times before you can fire it, right?


To prime, you push it 2/3 down, then use the lever for the last third, which is pretty much impossible to hand-prime. It's about a shot every 3-4 seconds, with hopper or rscb of course. So slower than a pump action blaster, of course, but this is more of a conceptual build. Future models will have improvements.

Edited by mysterio, 31 July 2013 - 03:38 PM.

  • 0

If two powerful is a problem then just go with one powerful. I guess this style of hopper will work even beyond three powerful..


15:46 *** Buff is now known as TheGdiddler
15:51 TheGdiddler I'M GONNA GRAPE YOU"

#10 lech

lech

    Member

  • Members
  • 128 posts

Posted 31 July 2013 - 05:07 PM

If you knock the release lever at the back of the caulk gun, when the blaster is primed, does the metal rod fly back at you?
  • 0

#11 mysterio

mysterio

    Member

  • Members
  • 249 posts

Posted 31 July 2013 - 05:28 PM

If you knock the release lever at the back of the caulk gun, when the blaster is primed, does the metal rod fly back at you?


Its actually really hard to depress with the blaster pressurized. Two hands hard.

But yea, if you want to deprime it, that's how.
  • 0

If two powerful is a problem then just go with one powerful. I guess this style of hopper will work even beyond three powerful..


15:46 *** Buff is now known as TheGdiddler
15:51 TheGdiddler I'M GONNA GRAPE YOU"

#12 Noodleownz

Noodleownz

    Self-Fondler

  • Members
  • 510 posts

Posted 01 August 2013 - 09:44 AM

This is really cool and innovative Mysterio. I knew I had to check it out after you mentioned it in chat last night and it did not disappoint! Is the total materials cost similar to a SNAP MK V?
  • 0
It's Nerf or Nothin'!

#13 mysterio

mysterio

    Member

  • Members
  • 249 posts

Posted 01 August 2013 - 01:34 PM

This is really cool and innovative Mysterio. I knew I had to check it out after you mentioned it in chat last night and it did not disappoint! Is the total materials cost similar to a SNAP MK V?


Thanks, and around 20 bucks, so I guess?
  • 0

If two powerful is a problem then just go with one powerful. I guess this style of hopper will work even beyond three powerful..


15:46 *** Buff is now known as TheGdiddler
15:51 TheGdiddler I'M GONNA GRAPE YOU"


1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users