Author Topic: Disco double air tube - improved version - opinions wanted (Read 29974 times))

tkerrigan · « **Reply #60 on:** January 19, 2012, 02:49:57 PM »

Posted by: lloyd-ss
« on: January 18, 2012, 08:15:29 PM »

"Tom, are you describing a skeletonized airgun where instead of the tubes and action being cradled in the stock, you have a more minimalist group of parts attached to the action?"

When I built my disco conversion, I just ordered a 2400KT with 24" barrel and skeleton stock from Crosman Custom, then disco tube and necessities from Crosman and just swapped them over. Took about 30 minutes. Would take just 15 minutes to add your tube and the breech end of the tube would help protect the gauge which sticks down now. Then it would be easy to add a small forestock to the bottom of your tube clamp after it was slid closer to the breech. Regards, Tom

gene_sc · « **Reply #61 on:** January 19, 2012, 09:34:02 PM »

I was thinking gauge at very end of bottom tube.

Quote from: rsterne on January 18, 2012, 01:36:05 PM

Makes sense.... I forgot that the gauge was mounted in the upper tube.... Could you mount if in the lower tube (usual location) but without an adapter?....

Bob

lloyd-ss · « **Reply #62 on:** January 20, 2012, 02:47:01 AM »

Gene,
Gauge on one tube, fill adapter on the other?

rsterne · « **Reply #63 on:** January 20, 2012, 01:03:00 PM »

Quote

Gauge on one tube, fill adapter on the other?

I think that might be just the ticket.... Maybe you could use the breech end to connect the tubes together at the old gauge port hole?.... just a thought.... By doing that, the front plugs on both tubes could be identical (threaded 1/8" NPT).... just use a band to keep them aligned....

Bob

lloyd-ss · « **Reply #64 on:** January 20, 2012, 02:17:35 PM »

Quote from: rsterne on January 20, 2012, 01:03:00 PM

Quote
Gauge on one tube, fill adapter on the other?
I think that might be just the ticket.... Maybe you could use the breech end to connect the tubes together at the old gauge port hole?.... just a thought.... By doing that, the front plugs on both tubes could be identical (threaded 1/8" NPT).... just use a band to keep them aligned....

Bob

I thought about that and there are compromises.

Gauge at front-
+ Bottom tube can be a little longer.
+ Custom stock wouldn't need a big gauge hole drilled in it.
+ others?
-gauge is bigger in dia than the tube, Cap for fill nipple would have to be special.
- Would have to deal with sealing pipe threads- might be an issue for some folks.
-Looking at the gauge means looking at the muzzle- Personally, that freaks me out.

Gauge in stock location-
+One less thing to mess with.
+ Matching caps at the front will give a finished look.
+ gauge is out of harms way.
- ??

Other considerations??

rsterne · « **Reply #65 on:** January 20, 2012, 02:57:53 PM »

As a Disco mod (the whole point, right?).... I think the original gauge location makes the most sense.... simple, safe, and doesn't leave a big unused hole in the stock.... no argument.... My thoughts were directed more at the modded QB stock....

You have me tempted to mod my Grouse gun this way.... The tubes would be 2260 length (or slightly longer), 8-shot repeater riser breech, 2240 trigger group and skelton stock, 14.6" barrel with a full length shroud.... Set it up for about 25 FPE (18 gr. @ 800).... aim for 24 shots (3 clips).... Use a modded 2289 pump grip for the forestock like I do now.... Like this, but with another tube....

Too many projects, too little time....

Bob

tkerrigan · « **Reply #66 on:** January 20, 2012, 03:55:31 PM »

I'm moving my Disco fill nipples to the gauge holes and mounting the gauges up front on a high pressure Street 90, can read it from the left side and appliance mounting is much easier. If I was left handed, I would read from the right side. On the fill nipple in the gauge hole, if an adapter was made to fit at the top of the fill nipple threads, you could snap the black protective cover on, it goes a long way to filling the gauge hole and would stick out about .35" to grasp it.
Regards, Tom

grumpy · « **Reply #67 on:** January 20, 2012, 05:56:29 PM »

Wow thats sharp ! Would love to have one like that.

Dave

Quote from: rsterne on January 20, 2012, 02:57:53 PM

As a Disco mod (the whole point, right?).... I think the original gauge location makes the most sense.... simple, safe, and doesn't leave a big unused hole in the stock.... no argument.... My thoughts were directed more at the modded QB stock....

You have me tempted to mod my Grouse gun this way.... The tubes would be 2260 length (or slightly longer), 8-shot repeater riser breech, 2240 trigger group and skelton stock, 14.6" barrel with a full length shroud.... Set it up for about 25 FPE (18 gr. @ 800).... aim for 24 shots (3 clips).... Use a modded 2289 pump grip for the forestock like I do now.... Like this, but with another tube....

Too many projects, too little time....

Bob

lloyd-ss · « **Reply #68 on:** January 22, 2012, 07:41:24 PM »

Here is the disco action with the double tube kit, installed in the QB78 target stock. The air tube is stock length, but the .25 cal barrel, at 28", is 4" longer than stock.
I will have another install ready to show in a few days that will have some special features that I think you will like.
Lloyd
P.S. I am making progress on getting parts CNC machined.

rsterne · « **Reply #69 on:** January 22, 2012, 10:06:14 PM »

Really beautiful, Lloyd.... looks like a factory gun....

Bob

gene_sc · « **Reply #70 on:** January 23, 2012, 12:36:39 PM »

Yep Lloyd this project is really coming along great. Can't wait to see what you have next to show us. And yes it does look like you just took it out of the box and laid it on floor for pics...

ezman604 · « **Reply #71 on:** January 23, 2012, 01:20:11 PM »

REALLY nice looking outfit Lloyd. I never thought of a QB stock for a Disco. May have to look into one of those. The matching end caps are a very nice touch. I'm guessing you CAN fill both tubes from either port or do you HAVE to fill each tube independently? My thoughts are for a .25, you will most definitely want a TKO or full shroud. Full shroud would require a little more routing of the stock and a larger barrel band.

Just throwing around ideas, not trying to dampen the project. It looks FANTASTIC!!!!
Can't wait to get my hands on a kit.
Happy Shooting!!!!
Dave

lloyd-ss · « **Reply #72 on:** January 23, 2012, 01:51:19 PM »

Quote from: ezman604 on January 23, 2012, 01:20:11 PM

REALLY nice looking outfit Lloyd. I never thought of a QB stock for a Disco. May have to look into one of those. The matching end caps are a very nice touch. I'm guessing you CAN fill both tubes from either port or do you HAVE to fill each tube independently? My thoughts are for a .25, you will most definitely want a TKO or full shroud. Full shroud would require a little more routing of the stock and a larger barrel band.
Just throwing around ideas, not trying to dampen the project. It looks FANTASTIC!!!!
Can't wait to get my hands on a kit.
Happy Shooting!!!!
Dave

Hey Dave,
Please, yes, all constructive comments are welcome. I do want to get it right.

The top tube gets a new threaded end plug and a dummy end cap. The bottom tube gets a new one-piece threaded end plug and fill nipple and a matching end cap. There is a cross-over tube between the upper and lower tubes that is incorporated into the two new threaded end plugs. You only have to fill via the one fitting.

I have been thinking about barrel bands because there will be alot of different combinations required. The two 7/8" air tubes will always be the same, but the top barrel or shroud will likely be the big variable, in diameter and center distance. I have some ideas about that.

Another thing is something for carbine folks who want to shorten the pair of tubes. I will offer a shorter lower tube and then a service of shortening your upper tube. One thing is that, because of the front cross-over tube, both air tubes must be even (same length) at the front. Using a rear cross where the pressure gauge is would allow stepped lengths at the front, but is a little more complicated and costly.

Lloyd

Norm_m · « **Reply #73 on:** January 23, 2012, 02:04:26 PM »

Hi Lloyd
Something that just crossed my mind was about depingers. Do you think both tubes would require a depinger? I have been installing a 3" piece of vinyl tubing cutting it lengthwise to get the correct diameter for a nice snug fit in the airtube. A very simple easy way to take away all the ping in your PCP.

Norm

lloyd-ss · « **Reply #74 on:** January 23, 2012, 06:16:49 PM »

Norm,
Yes, I think as closely coupled as the two tubes are that they both might behave the same, but then again, the lower tube is nestled pretty well down in the stock. I think it would have to be shot outside with a shroud to really tell how much it needed a depinger in both tubes. It would be easy to slip one in by just removing the action from the stock.
Lloyd

MustangMike · « **Reply #75 on:** January 23, 2012, 06:32:16 PM »

Quote from: Norm_m on January 23, 2012, 02:04:26 PM

Hi Lloyd
Something that just crossed my mind was about depingers. Do you think both tubes would require a depinger? I have been installing a 3" piece of vinyl tubing cutting it lengthwise to get the correct diameter for a nice snug fit in the airtube. A very simple easy way to take away all the ping in your PCP.

Norm

yup, did the same thing to my disco a cuple of days ago really works to get rid of that ping

melvin · « **Reply #76 on:** January 23, 2012, 07:22:52 PM »

Quote from: lloyd-ss on January 22, 2012, 07:41:24 PM

Here is the disco action with the double tube kit, installed in the QB78 target stock. The air tube is stock length, but the .25 cal barrel, at 28", is 4" longer than stock.
I will have another install ready to show in a few days that will have some special features that I think you will like.
Lloyd
P.S. I am making progress on getting parts CNC machined.

That looks rad. Its coming along nicely.

grumpy · « **Reply #77 on:** January 23, 2012, 07:42:41 PM »

That looks sweet. Any plans on offering a ready to roll version ? Or how about a big bore version if the double tubes would support it.

Dave

MustangMike · « **Reply #78 on:** January 23, 2012, 08:45:40 PM »

Bigbore twin tube kit ? Maybe make the bottem tube the same size as a mrod tube for anything over .25cal.. should add a few shots for a 9mm or 308 build..

degriz (AKA) Lou Hauburger · « **Reply #79 on:** January 24, 2012, 04:53:25 AM »

That is some beautifull work, I really like the way it looks in the Qb stock with the thinner band.

I sure would like to buy one when you are selling the kits. Even in the raw with a bed liner finish would work for me.

Are you starting a list of interested buyers? let us know llloyd

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Disco double air tube - improved version - opinions wanted

Author Topic: Disco double air tube - improved version - opinions wanted (Read 29974 times))