FX Any plans for different sized DRS Plenums?

[FLgunner]

Just wondering if FX or anyone else is working on any other sized plenums for the DRS? I have a .22 with the 600mm barrel. I came with the 11cc plenum which is very efficient but is not great for heavier ammo or higher power. I purchased the SHP 63cc plenum and it makes a huge power increase, almost too much, but also turns the DRS into a huge air hog since the plenum is 10% of the overall air cylinder volume. IMHO about half that would be much better!

It seems to me someone should be able to produce a plenum that falls somewhere in between these 2 extremes. The Dreamline Power Plenum is 17cc, but you can add a second one and double that (34cc). Either a one piece medium sized plenum with a volume of around 30cc or even an 11cc extension that could be added between the DRS and the stock 11cc plenum that could double the size would be a nice compromise.

Anyone aware of anything being developed to fill this gap between 11cc and 63cc?

 

[psycho62]

Just wondering if FX or anyone else is working on any other sized plenums for the DRS? I have a .22 with the 600mm barrel. I came with the 11cc plenum which is very efficient but is not great for heavier ammo or higher power. I purchased the SHP 63cc plenum and it makes a huge power increase, almost too much, but also turns the DRS into a huge air hog since the plenum is 10% of the overall air cylinder volume. IMHO about half that would be much better!

It seems to me someone should be able to produce a plenum that falls somewhere in between these 2 extremes. The Dreamline Power Plenum is 17cc, but you can add a second one and double that (34cc). Either a one piece medium sized plenum with a volume of around 30cc or even an 11cc extension that could be added between the DRS and the stock 11cc plenum that could double the size would be a nice compromise.

Anyone aware of anything being developed to fill this gap between 11cc and 63cc?

Great question in my opinion. This is the question that is holding me up on purchasing the DRS wood stock version. Before i pull the trigger on this FX id like to know about availability of add-ons in advance.

 

[R0B]

What about putting a filler in the large plenum to reduce volume. I know a guy who has done this.

 

[Justaguy]

Fill the SHP halfway full with epoxy. Then post results. Take one for the team

 

[FLgunner]

What about putting a filler in the large plenum to reduce volume. I know a guy who has done this.

Do you know what he used as a filler? I was thinking of filling it half way with BBs, but was concerned one might end up in the valve!!

 

[FLgunner]

Fill the SHP halfway full with epoxy. Then post results. Take one for the team

At $85, I’ll sell it to someone else before taking a chance on permanently ruining it.

Plus, filling it with epoxy kinda killed the usefulness of the angled gauge attachment.

 

[R0B]

I think he just turned down some plastic round bar and filled the holes with that

 

[FLgunner]

I think he just turned down some plastic round bar and filled the holes with that

I have a similar idea. The SHP Plenum has 3 plugs similar to the one on the front of the standard plenum. When I move them there are essentially 3 holes connected by either open space of a passage way. The diameter of these holes is just shy of ⅝". I'm thinking of cutting a couple lengths of wooden dowel and just slipping them into the two opening accessible from the top of the plenum. This should reduce the overall volume but still allow air flow around the dowels. I'm on my way to Ace to pick up a 3" length of 5'8" dowel to see how it fits. I may have to sand it down some, but should be much. Then I can add one or both to essentially have a variable volume plenum!

 

[FLgunner]

So, a $5 ⅝” dowel from A e Hardware, a little sanding and cutting to the proper length and I have two plugs for the plenum. I need to do some math to figure out he actual volume offset by each dowel and I should be able to figure the plenum volume with each or both dowels installed.

 

[Airgun Al]

Thats the great thing about FX...
I bet it wont be long, and there will be numerous 3rd party FX accesories available.

Until then, what about re-machining new threaded plugs (caps), and extend them, makeing them deeper, thus decreasing plenum volume inside?

Also, would a thick liquid sealer, (like used on the inside of motorcycle fuel tanks) that dries to a hard, and solid shape work? Youd have to be very careful about where the liquid flows, before it hardens, and turns solid. And you might have to perform this several times, in order to reduce volume enough to really make a signifigant difference. Also, Im not sure how much the internal dimensions of the plenum will change, from full to empty, and if it would effect the adhesion of this sealer, once it is hardened. ???? Ive used a product called KREM, and it works great for filling small holes in a gasoline fuel tank....Not sure about how it would work for simply takeing up space, in a plenum.

 

[Airgun Al]

So, a $5 ⅝” dowel from A e Hardware, a little sanding and cutting to the proper length and I have two plugs for the plenum. I need to do some math to figure out he actual volume offset by each dowel and I should be able to figure the plenum volume with each or both dowels installed.


View attachment 472388

The nice thing about what you have done here, is its reversable!

 

[FLgunner]

The nice thing about what you have done here, is its reversable!

Exactly! Plus, the wooden dowels are different lengths, so technically different volume offset depending on which one you use or if you use both.

 

[Impact701]

I was actually wondering how to make the SHP plenum 10cc bigger. Then it would be the same size as M3 plenum.
I would like to shoot the .218 38gr Heavy slug @ 970+ fps but at 170bar I can only reach 955+fps.
I would rather not increase the reg anymore, but maybe that is the answer ?

 

[Justaguy]

I was actually wondering how to make the SHP plenum 10cc bigger. Then it would be the same size as M3 plenum.
I would like to shoot the .218 38gr Heavy slug @ 970+ fps but at 170bar I can only reach 955+fps.
I would rather not increase the reg anymore, but maybe that is the answer ?

Are you related to Tim 'the Toolman' Taylor?

 

[Impact701]

Are you related to Tim 'the Toolman' Taylor?

I think he's a distant cousin !
I've been shooting .25 H&N 40gr from my M3 @970fps for quite a while.
So it is very underwhelming when I hit a target steel or otherwise with my DRS 22 shooting H&N 34gr @ 960fps
I am thinking about converting this DRS to. 25 or maybe get another DRS in .25 ??

 

[FLgunner]

Adding the 2 dowels reduced the volume by 26.5cc, so it's a tad over half the size it was. I was looking for between 25cc and 35cc and ended up with 36.5cc. I did a 10 shot string to test it out and the first shot was 898fps, the remaining 9 was 900 fps! This is shooting the 21.9 grain AEA pellets. Accuracy is also excellent, so I think I'm going to let it stay where it is for a while and just test some other pellets at this setting. I did swap out the tungsten hammer weight for a 14.5 gram brass hammer weight. The regulator is set to 110BAR and the HST is a full 4 turns in from flush with the back of the breech. The only thing left to do is check shot count, but with the volume of the plenum reduced by almost half, it should increase significantly over what it was before using all 63cc of the plenum.

 

[Leatherman]

This is great experiment . But It would be nice to see what gains in velocity from the stock standard DRS plentum is with a few different reg settings and then compared with this 36 cc plentum. Use one pellet weight and Of course everything needs to be as stock for a real comparison. This would,show us if a middle size plentum would be worth it.

 

[FLgunner]

I did run a shot string with the standard 11cc plenum before I swapped to the SHP plenum. Same pellets, same settings, just changed the plenum to the SHP with the 2 dowels, average FPS was 791. So, it gave it an increase of 109 FPS.

 

[Airgunmann]

I really like the idea of a wooden dowel to change plenum size my drs is a 700 shooting 40 gr at 940 ish using a 14 gram hammer for almost a magazine which I thought was really good I'm tempted to throw in the slug power kit and tuning spring from huma I have and free flight the hammer I've changed the valve spring and turned the stem down also so it breaths a tad better than the original

 

[Impact701]

I really like the idea of a wooden dowel to change plenum size my drs is a 700 shooting 40 gr at 940 ish using a 14 gram hammer for almost a magazine which I thought was really good I'm tempted to throw in the slug power kit and tuning spring from huma I have and free flight the hammer I've changed the valve spring and turned the stem down also so it breaths a tad better than the original

I installed the slug power kit in my 22 700, I gained 15 fps with the slug probe only. The only thing the tungsten hammer weight did was allow me to back off hammer spring tension so the rifle is easier to cock. I did not gain any velocity from the extra weight.