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UMB with Titan underslung

An awesome novice primary

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#1 Curly

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Posted 04 March 2012 - 08:48 PM

Note: This mod was for the CanadianNerfers.ca mod contest, which I why I was so pressed for time.

First off I'd like to thank the leap year for allowing me the time needed to finish the mod on time. Making poor decisions also deserves thanks, because it ultimately improved the end product. Be forewarned that the Titan won't have the power it did stock, I'll explain later. I'm sorry I didn't document this well, I made most of it over a month and the rest in 3 days, so pictures were scarce.

This mod integrates a Titan to a Ultimate Missile Blast, making for a nasty primary to battle against. All my vinyl tubing fittings are from http://www.ark-plas.com/ where they offer FREE sample packs of their stuff, which would be enough for several of these mods. You need to superglue the connections however, they don't hold pressure alone. This is what we'll be making:

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Let us begin.

Since the Titan needs more work done, we'll start there. Pop it open and all you can remove the pump and the hornet stuff. If you REALLY wanted to you could rewire it and use a THIRD primary on the same pump, but I think that's too much pumping. You can remove all the safety garbage, it's silly. Cut the pressure gauge tube in half, and remove the gauge. I put a 1/4"x1.5" washer in it's place and bolted it down. You can cut the tubing leading to the pump off the tank entirely, since it needs to be plugged anyway. Once the tubing is off toss the pump into your parts bin, they're great pumps. Plug the open barb on the tank with epoxy or something.

Then take a check valve and add ~1 foot of tubing to the "IN" barb and 6" to the "OUT". That's too much but you don't know how much you'll need exactly. stick the 6" of tubing inside the pressure gauge tube, it should fit snugly after some force. Test to be sure when you blow into the tubing with the Titan tank open air flows, but when you suck air it stops. To glue the barbs to the tubing I put superglue in the tubing and pushed it in with the barb. Once it's dry you can glue the end of the tubing in place too. Besides not having the long tubing attached, it should look like this:

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Now to the UMB.

This one's easy, open it up and cut off the barrel, leaving 3/4" of black barrel behind. This is for a direct hoppering, if you want a coupler you'll have to improvise. Now lay the internals into the shell again and drill a 1/8" hole in the pipe running from the pump near the middle (picture later). Then cram a barbed elbow into the hole, it'll take some convincing. Then superglue it there, ideally with epoxy slathered around it once that's dry. These will have some 30+ screws when done, you don't want it to break on you.

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Now comes the boring part- shell cutting. Take the internals out of the blasters an put them in a safe place. Cut the front sight off the Titan. Fiddle around with the back of the titan, cutting it until it's short enough to fit nicely under the UMB. Once you're happy with it, E-tape the shells closed and tape them together securely. It will look like this:

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You have some freedom with the next couple steps. Most people sand and use massive amounts of epoxy putty to merge the two shells permanently. I made sideplates out of 1/4" Acrylic (the nastiest shit off all time, use polycarb). I won't post templates because there aren't any. I cut two pieces to 1.25"x6.5" and dremeled them down to size. I sanded them after the dremel work to hide screwups. With these, the shells can be secure(my holes didn't match the screws, so it's not) and you can open the shells individually. I'll probably epoxy putty it anyway, but I can't go buy more putty right now. I put the sideplates on like this:

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It might be good to use L-shaped sideplates and attach them to the Titan twice. I also screwed the left shells together twice from the inside:

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When the shells are all nice and together put the internals back in and locate a way to attach the 12" tubing to the barb on the UMB tank. You'll need to dremel the left side of the shells, and dremel the bottom integration clamp off the UMB's right side. Look at where the tubing would be, it'll make more sense.

Once you've trimmed the tubing to fit well in the shells without crimping you can glue the tubing connections. Give it 10 minutes and test to see if it holds air for a 5 minutes straight. Like I said above, your Titan will barely be able to fire the rocket.

While this is very upsetting for some (cheyner specifically), it allows for many other systems. The Titan is often considered too powerful without three barrels or another range-diddle system. Shotgun attachments are nice, but they take awhile to reload and even longer to pressurize the tank to acceptable levels. Coop made a Youtube video awhile back detailing his 4B +bow attachment that featured a shotgun RSCB (but he didn't design it). You take any RSCB and make the first couple inches of the barrel your clip material. This lets a couple extra darts be fired at once, but with better ranges than a shotgun barrel. It also holds a reservoir, and is suited to the Titan tank when at the UMB's pressure levels. You could just modify the OPV like BOSS9/kingnoob did, which would make both blasters shoot farther. I'm fine with the UMB how it is, and the Titan is workable.

Back to work!

I made a Titan attachment before modding it. It was meant for shotgun barrels, but also accepts 1.5"x1/2" reducing bushings allowing single barrels. Cut the stock barrel down until it's flush with the start of the threads. You can rip off the 4 tabs on the tank that stop you from taking the barrel off so it will come on and off easily. Cut a length of 1.5" PVC that lies flush with the threads when placed on the barrel. E-tape and attach that, then slap a coupler on of it. Superglue all connections and you have a modular barrel system.

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I was actually getting war-safe ranges with a 12" singled barrel, it was less than my 3K. It was a waste of air however, a Titan tank aspires to so much more. The RSCB above is a shotgun RSCB, which fires 3 shots at a time. Works the same, just does more. Ranges are quite good for a shotgun, but it seems to have a vertical spread. Probably a chip in the barrel, but adjustable spread might come in handy. After some testing the shotgun barrels don't hit harder than the UMB, as they don't penetrate my dart board consistently like the UMB does. Trust me, it's nothing to be worried about with a UMB OPV.

You're on the home stretch now, don't give up!

All that's left is to hopper the UMB and put on some finishing touches. I took a wye and dremeled the rear port enough to fit 3/4"CPVC and epoxy puttied it on. Expect to use a full tube of putty, you need it. As the putty dries you should gently adjust the barrel and hold it in place for a good 10 minutes. Yes, that means aiming down your barrel for 10 minutes without putting the blaster down. It's a surefire way to get the barrel PERFECTLY straight, provided it's not disturbed during or after it dries. Angel, you should have no qualms with the barrels. My first UMB has a slight barrel misalignment, and it took me until lunch at my first war with it to properly compensate for it.

You can dremel the inside of 1/2" PVC too, but 3/4"CPVC is less work. The UMB is working at it's natural pressure, so expect whatever you usually get out of them. I get ~95' with a 9-shot hopper, not too shabby for a $7 blaster with a titan under it.

If you haven't figured out already, firing the UMB won't affect the Titan at all. Firing the Titan however will open the check valve and empty both tanks. There is an audible hiss when the UMB is venting out the Titan tank. You could add a second check valve to the blaster, but that's much harder than adding one to the Titan like I did. You also will have a section of tubing that is CONSTANTLY pressurized even when the tanks are empty.

I should also add that the top expansion port of the UMB isn't touched. The weight of a second UMB is probably too much, but I'll probably screw around with it anyway at Massacre 7.

Here is the finished product:

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In conclusion, this mod is the greatest of all time, duh. If I missed anything or you felt I didn't cover something in enough detail I'll be happy to elaborate. You may now flame.

EDIT: Here's a pic of the finished internals. The other stuff didn't change at all so it's not pictured. Thanks RevisionFive!
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Edited by Curly, 05 March 2012 - 03:24 PM.

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#2 the mod man

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Posted 04 March 2012 - 09:03 PM

That's one sick beast you have there. I was a bit disappointed when I saw the ,"can barely shoot the missle" part because I'm the kind of person who loves cobra's with Titan missiles, and I would love to see an HPA, external air or some other form of alternate power supply on there. Nice, easy to follow write up too.

Edited by the mod man, 04 March 2012 - 09:08 PM.

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#3 Guest_trash_*

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Posted 04 March 2012 - 09:03 PM

This is cool, it makes me think of taking shell pieces from a junky Buzzbee watergun for the top parts that snap together, and weld that to the tops of the Titan shell, then you could attach it there, but be able to take it off too like the way the Rapid Blast can hook on there. The Buzzbee attachments have worked & been pretty strong for me, I have the Maniac and Rapid Blast, Renegade, Outlaw, and three Bandits that cost 99 cents from the thrift store. Only one bandit works so I can cut up two any time. I hope I find a UMB soon.
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#4 Curly

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Posted 04 March 2012 - 09:07 PM

This is cool, it makes me think of taking shell pieces from a junky Buzzbee watergun for the top parts that snap together, and weld that to the tops of the Titan shell, then you could attach it there, but be able to take it off too like the way the Rapid Blast can hook on there. The Buzzbee attachments have worked & been pretty strong for me, I have the Maniac and Rapid Blast, Renegade, Outlaw, and three Bandits that cost 99 cents from the thrift store. Only one bandit works so I can cut up two any time. I hope I find a UMB soon.

I had that thought exactly but for the Surge 6. I just didn't like having to buy a ball valve to let me use the UMB on it's own. There's also the fact that I have 4 UMBs that are NIB, which cost me $7 each(probably the cost of a ball valve). The waterguns might have good tanks themselves, it might be worth looking into that.

@Modman ya, I was both upset and perplexed when I found out the OPV of the UMB didn't match. Once I found out that I could safely use a shotgun RSCB I was happier, but there are workarounds for the pressure issue. Like I said in the writeup, you can modify the OPV to reach higher pressures, just watch the UMB's power. You could also splice in another pump for the Titan, which is somewhat better.

If I were to do this in the future I might integrate the UMB to the Titan to use the higher pressure.

Edited by Curly, 04 March 2012 - 09:12 PM.

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#5 cmeej

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Posted 04 March 2012 - 09:53 PM

What was the contest? Overpowered as hell? Great job!

Edited by cmeej, 04 March 2012 - 09:54 PM.

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#6 MattTheSasquatch

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Posted 05 March 2012 - 05:44 PM

I'd hate to go near that barrel loaded. But awesome job Curly. A quite clean and sturdy mod I must say.

Edited by MattTheSasquatch, 05 March 2012 - 05:44 PM.

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#7 Freezy

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Posted 06 March 2012 - 10:11 PM

Isn't a RSCB'd titan banned in most wars?

Just asking.
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#8 Buffdaddy

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Posted 06 March 2012 - 10:28 PM

Isn't a RSCB'd titan banned in most wars?

Just asking.


The clip itself extends past the air input; this results in 3 darts or so getting pushed out in a shotgun of sorts.
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#9 Curly

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Posted 07 March 2012 - 04:26 PM

RSCB'd Titans are banned, but I've never tried a shotgun RSCB on one. I just opened my NIB Titan to test it, only to find out something is leaking! I guess I can't test it, or use the Titan without extensive mods. Dangit!

The reason the UMB-Titan is safe is because the Titan OPV releases at a higher pressure than the UMB's. Because I'm using a UMB pump the Titan never reaches the pressures it did when it was stock. I know this because using the stock trigger setup, the missile barely fires, but when it was stock it shot very far.

Edited by Curly, 07 March 2012 - 04:29 PM.

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#10 Slime

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Posted 12 March 2012 - 08:43 PM

Very nice, really clean too. It was pretty fun seeing this in action at Massacre. ^_^
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