24 replies to this topic

[Pwnzer MK II]

Ok
I created a mod for my UPS so that it can fire any kind of nerf ammo like including the regular nerf darts and the bbb missles ,but for some reason it cant shoot longshot darts.

can anybody explain why this is?

the N-strike gun is the Titan As-v.1

Edited by Pwnzer_MK_II, 19 September 2007 - 04:21 PM.

[PvtMcFlurry]

First off I think you mean UBS for Universal Barrel System and secondly I think it is because the Streamlines don't have a tip like other nerf darts. It's like shooting a stefan. So that's probably your reason.

[Pwnzer MK II]

Not true because i can shoot stefans just fine . its just the streamline darts that wont work

[NerfMonkey]

UPS:

Unity
Power
System

You'll have to give us more information before anyone can help you. If you put a barrel on that fits the rubber tips of suction darts, streamlines won't make an adequate seal in the barrel and will suck. If that doesn't seem to be the problem you'll have to elaborate on what you did to the gun so someone with experience in that area can help you.

[Pwnzer MK II]

ok ill try to explain what i did as best i can

1 titan air restrictiors remove (barrel and gun)
2 longshot blaster barrel is put where gun air restrictor was.
3 titan barrel screwed back on
4 bbb barrel piece that had been dremmel out (not end piece, the aproximately 4.5 inch long) is put into the titan barrel (short side of ridge end first)
5 bbb barrel end piece is put on the other bbb piece

how it fires correctly and why it fires correctly i do not know

[Quilan Fett]

I think you are using 5/8 stefans, which will work, but this barrel is too big for steramline darts.

[Pwnzer MK II]

again nope im shooting 1/2 fbr stefans

[SHADOW HUNTER ALPHA]

The barrel of the LS is too big. I know you think otherwise, but it is a mock barrel. The bore DOES NOT touch the streamlines on their way out. It is mainly for looks and not functionality. Are you using Frost King FBR (because their packages always show two different sizes for some retarded reason, and you may be using the wrong reading)?

Edited by SHADOW HUNTER ALPHA, 19 September 2007 - 05:16 PM.

[Pwnzer MK II]

im shooting 1/2 fbr made by M-D building products (bought at home depot).

yup just measured it its 1/2 inch

Edited by Pwnzer_MK_II, 19 September 2007 - 05:17 PM.

[SHADOW HUNTER ALPHA]

The reason regular darts work is because the heads are larger in diameter than the bodies. If you use 1/2" FBR, then your stefans cannot be getting the same results, because they lack this head. Some of your details must be off...

[b00m13]

It's very simple, you are using the BBB stock barrel, which is MUCH LARGER then 1/2". So when you fire, all the air's escaped around the streamline. When I wanted to fire BOTH BBB Arrows and stefans/darts, I inserted a Crayole tube inside the BBB barrel, and it worked wonders.
So my advice to you, since you have 2 BBB barrels fused into 1 long barrel, is to insert a paper clip at the end of the crayola tube (to act as a catch for the darts), and insert the crayola barrel into the BBB barrel.

[Pwnzer MK II]

the darts dont just sit in the bbb barrel they go down the LS blaster barrel all the way down to there the threaded piece that the titan barrel attaches to( the blaster barrel is inside that piece)

my setup works just fine for now but soon (more like hour and a half) im going to put a brass tube in place of the blaster tube that extends to the tip of the bbb barrel
any tips on what diameter barrel

and no im telling you people it shoots stefans just not streamlines

and if anyone wants ill post a writeup when my camera gets back from the shop

-update-
ok just put in the brass barrel, stefans shoot fine but now the streamlines just spiral twords the target at high speed

Edited by Pwnzer_MK_II, 19 September 2007 - 07:27 PM.

[Nonsense Man]

Thats because streamlines have the hole in them so they fishtail or maybe your barrel is a bit to short.

[Pwnzer MK II]

nah couldn't be that the barrel is to short because it is longer than a longshot barrel

[SHADOW HUNTER ALPHA]

Barrel lengths differ for different guns. Between 1.5-2 feet is typical for a Titan barrel replacement mod. If you're in that range, you're fine. Also, the part of your description that made no sense was the one of being able to fire stefans but not streamlines. 1/2" stefans have the SAME diameter (or extremely close to it, within the 32nds or 64ths of inches). There is no reason why one would work and the other wouldn't.

For the new mod: The LS darts always tend to fishtail from high-powered guns. The holes in their tips cause this, which is why stefans or plugged streamlines work better.

[Pwnzer MK II]

for the stream line darts i think they sorta put the hole as a saftey precaution because if it goes over a certian fps the hole causes it to slow itsself down

be prepared for a write up because i havent seen one for what i have done


oh well for the old mod problem because it has been fixed

Edited by Pwnzer_MK_II, 19 September 2007 - 10:07 PM.

[zaphodB]

No. The hole is so the ends of the darts are squishy. It's like the two holes in the end of a titan missile. It cushions the impact.

[bpso86]

Hahaha you guys crack me up.

The hole has a negligible affect upon the aerodynamics of the streamline when being shot out of a titan. Seriously. The problem is that there is absolutely no weight in the nose. Rockets work by having the COM (Center of Mass) as close to the nose as possible, and as far away from the propellant. This will allow the largest amount of momentum to continue to travel in a straight line without trying to flip upon itself.

Trust me on this one, I've plugged the holes with hot glue, cut them off, etc. When being fired out of an extremely high powered gun, the only thing that can solve the fishtailing is nose weight. My two water/air powered rockets also flew the highest and straightest out of my whole class here, so I've done a little research. (Not to mention, each of them had a nerf ball in the nose to cushion it hehe)

Oh, and zaphodB, I do believe that it's the rubber/foam that makes the ends of the darts squishy, not a little hole with the absence of said material. I lol'd at your post.

Edited by bpso86, 19 September 2007 - 11:08 PM.

[Pwnzer MK II]

I understand what your saying but why is it that a high powered long shot can still fire them straight?

Edited by Pwnzer_MK_II, 20 September 2007 - 07:19 AM.

[zaphodB]

Oh, and zaphodB, I do believe that it's the rubber/foam that makes the ends of the darts squishy, not a little hole with the absence of said material. I lol'd at your post.

Then you're an idiot. Press on the tip of a streamline. It's squishy, right? Now cover the hole with your finger and do the same thing. It's less squishy. That's because the air can't escape.

[SHADOW HUNTER ALPHA]

I don't think it makes as much of a difference as what bpso86 said. Which is strange, because I had never really thought about it in that manner. I always used to believe that the hole caused more drag or something on one side (that was possibly the least educated guess I ever made, seeing as I haven't taken physics or any other class that might teach this...). Oh, well...

bpso86: How aerodynamic is the streamlined dart compared to, say, a typical stefan anyways? That's something I've been trying to figure out for a while now.

[frost vectron]

I understand what your saying but why is it that a high powered long shot can still fire them straight?

A longshot is not nearly as high powered as a Titan.

[bpso86]

Then you're an idiot. Press on the tip of a streamline. It's squishy, right? Now cover the hole with your finger and do the same thing. It's less squishy. That's because the air can't escape.

Look bud, I don't wanna argue with you, but you don't necessarily understand how the dart transfers its momentum. When you hold it in your hand, firm, and press, you're putting waaaaay more pressure on it than it would have hitting an object. As soon as it touches the object, it's light and flimsy body just gets knocked back away from the object, due to not having much weight, and therefore not much momentum. The darts will not "squish" as you say in mid flight. Especially not from a stock nerf gun, the way that nerf designed them. In all likelihood, it was just an engineering mishap and that hole was there by accident, who knows. And way to throw the "less squishy" in there, which means that rubber is still squishy. If your theory about "squishiness" (why are we still using this word?) is correct, then shouldn't the mars rover have been dropped in a balloon-type-thingy that immediately let out the air upon impact? No, because that would have destroyed it.

Anyways, this argument is pointless and doesn't matter, because a streamline hitting you doesn't hurt. Period.

bpso86: How aerodynamic is the streamlined dart compared to, say, a typical stefan anyways? That's something I've been trying to figure out for a while now.

Well NerfMonkey and I were talking about this the other day, and it's really about drag. The frontal surface area is just a tad bit larger, so a stefan would have just a tad bit more drag on it. There's also aerodynamic drag, which is due to the air rushing over the body and the resulting pressure forces, but I can't really estimate that at this time. The one thing I've remembered, though, is that rounded tips work best for subsonic flight and real pointy tips work best for supersonic flight. That's pretty much it.

Oh, and my longshot still spirals streamlines out of control, with the tips, with them filled with hot glue, and with them cut off.

Edited by bpso86, 20 September 2007 - 06:46 PM.

[Pwnzer MK II]

wow i was not expecting this topic to go on so long after i fixed the problem

[zaphodB]

shouldn't the mars rover have been dropped in a balloon-type-thingy that immediately let out the air upon impact? No, because that would have destroyed it.

That's because the mars land rover landing device was designed with the safety of what was inside of it in mind, not the safety of the surface of the planet. You would do better to look at airbags in cars. They deflate moments after impact, to make that impact less traumatic.

I agree with most of what you said, but I still think the hole is a safety feature for cushioning. There are two reasons I think that.

1. There's another example of it on the titan missile.

2. Empirical evidence. The dart is more cushioned with the hole there than if it's not (if you cut the dome off, the darts hurt more (but still not much))