11 replies to this topic

[NerfMonkey]

These bombs use a lot of the ideas foamsmith came up with for his homemade arrows. I take little credit for this idea as this is pretty much just a simplified version of the arrows meant for a different purpose.

Okay, on to the construction.

Materials:

1.5" OD foam pipe insulation. I'm not sure what it's labeled as but if the OD is 1.5" and it has a hole in it, that's the right stuff.

1/8" foam craft sheet

Scissors or an exacto knife

Hot glue gun

BBs or other weights

5/8" FBR

Procedure:

First plug in your glue gun and cut your foam pipe insulation in to a piece about 4 or 5" long. This will be the body. Try to make at least one side as straight a cut as possible.



Now, once the glue gun is heated up, cut a piece of craft sheet and about 1/2" of the 5/8" FBR, and hot glue the craft sheet around the FBR, like this:




Then put a ring of hot glue around that whole thing (the FBR and craft sheet) and stick it in the end of the pipe insulation piece, the end with the straightest cut. Notice that the glue is smeared all over the end of it. This is only because I stuck the whole thing on a CD case when the glue started oozing out. You could use a tissue or something else to clean the oozing glue off too. It should look like this when the FBR and craft sheet assembly is securely glued in to the pipe insulation:



Now, make a very large hole in the piece of FBR, but be careful not to got all the way through it. This is like making a normal Stefan with LOTS of weight. Make the hole and drop in about 5 BBs, or about 1 or 2 1/4" slingshot balls. I decided on BBs since the slingshot balls weren't opened yet and I didn't want to bother with them. BBs work fine as long as you put a lot in. Put glue in first, then the BBs or slingshot balls, then a nice dome of glue. It should look like this:





Now take your scissors or knife and cut a round piece of craft sheet to fit over the top of the unfinished bomb. I suggest making it a little bigger than the end and trimming it to fit. Glue it on there using LOTS of glue and it should be finished! Hopefully the bomb will look about like this. Oh, and after the glue is all dry you can add some electrical tape around the seam between the pipe insulator and craft sheet for added durability and schmexiness.



Here's the video to prove that these bombs will actually work. To fire them you can either use a certain size of large PVC (Renegade told me it was 1 1/4" PVC, I think. Can you clarify Ren?), or as I do, use a short barrel of CPVC about 5 or 6" long with enough electrical tape on the end to make a snug fit. This video shows the grenades being fired from my fugly 3k (it wasn't my choice to single it, get off my balls), which is pretty much my test gun for new concepts.

http://s3.photobucke...grenades013.flv

As you can see, the bombs don't get the best range, but for explosives wars they're a cheap alternative to LBB missiles and Nerf arrows. We play that if a piece of any type of explosive ammo lands within five feet of you you're out. These are good for lobbing at targets, and the ROF is pretty good.

Edited by NerfMonkey, 03 August 2006 - 05:22 PM.

[King Of Butt Land]

Nice job monkey. Props to you for createing an easy alternative to not modding your Lbb.

-Butt

[NinjZ]

I suggest using a compass and sketch out circles on the craft sheet, then cut it so it's perfectly circular.

[SPU-Nerf]

How is this a grenade? It doesn't spray foam when it hits.
Is it just an add on kind of like a rifle grenade? (with out the exploding)
What is its use? To hit people hiding behind a wall or something?
Just trying to figure this idea out.

[ShadowSniper]

Correct me if I'm wrong but;
Its for wars where everyone is using "grenades", aka arrows, missiles, and various large-bore ammo instead of the standard megas and micros, the idea being that you act as if it is a grenade and if it lands within a certain distance of you, your out.

[fobpawwor]

Yeah, I think that is what he means. He says, "We play that if a piece of any type of explosive ammo lands within five feet of you you're out. These are good for lobbing at targets."
You got it.

[NerfMonkey]

Butt, thanks. I didn't really create these for a way to avoid modding my LBB, but yes they'd work from a stock LBB or 3B. Better from the LBB probably, since it's got so much power. Thanks again for the "props." ;-)

NinjZ, that's a really good idea. That would cut down on the time to make them too, right now they take about 5 minutes each for me. I could do them faster but for real quality it takes pretty long. Thanks for the idea!

Shadow and fob: you guys hit the nail on the head. That's exactly right.

SPU, I'm sure with a little work and a spare spring I could get the bombs to blast darts out the back after they're fired or something along those lines, but it's Nerf. Last summer I think it was, I made some grenades out of film canisters that could easily be adapted to fire from a gun and explode on impact. If I was looking for something to spew foam I'd've used those with something on them to fit PVC.

[LastManAlive]

Just did it, and I formed it around the barrel as I made it to get a good amount of pressure...don't do what I did. When the glur dried, I shot it and it took the barrel with it. It fits on there really good, but it's justa little too tight. I'll try sharpening a peice of pipe in the end some and cut it down on the inside. It's really nice for indoor war, no marking on the walls, except for the barrel turning up in the vack during flight to skid across the wall.

[Flaming Hilt]

[I was going to post a new topic for this, but I think that it is appropriate to continue off of this one]

...the bombs don't get the best range...

Theoretically, shouldn't bombs/larger projectiles be able to get better range than other types of ammo?

I KNOW you guys hate comparing nerf and real life -- but this is for physics, not tactics: The general assault troop uses who-knows-what-kindofa-gun, with smaller ammo (say 3-4mm). The typical asshole uses medium ammo (5-6mm). And as we all know tanks use anywhere from 30+ mm... as you can see, the bigger the ammo, the farther it shoots. Also, though, the longer the barrel to give more acceleration.

So theoretically (again), if we were just to put longer barrels on our "bomb"-shooting guns, wouldn't they shoot farther? Rather than sticking a "bomb" on the end, how about actually making a barrel big enough to hold it, making it at least 2 feet long, and figuring some major propellent mechanisms?

Discuss. And sorry for semo-hijacking the thread.

EDIT: I feel I need to clarify: Projectiles with more weight carry more inertia. Therefore, we'd need longer barrels to accelerate them to a decent speed, but their inertia would keep them going for farther than a dart once they've reached this speed.

Edited by Flaming Hilt, 08 August 2006 - 10:37 AM.

[pat 1st Lt]

I KNOW you guys hate comparing nerf and real life

Yeah, a lot of people do.

but this is for physics, not tactics: The general assault troop uses who-knows-what-kindofa-gun, with smaller ammo (say 3-4mm). The typical asshole uses medium ammo (5-6mm). And as we all know tanks use anywhere from 30+ mm... as you can see, the bigger the ammo, the farther it shoots. Also, though, the longer the barrel to give more acceleration.

*Ugh*... Alright. Here we go.

What shoots farther: a howitzer, or a 9mm pistol? The howitzer, obviously. What uses a larger explosive charge to launch the round? The howitzer, obviously.

So, lets say that you didn't know any of that, alright? Since you don't know which one uses the larger charge, lets say that you load a pistol with 10g of gun powder, and a howitzer with 10g of gunpowder. Which one will shoot farther? The pistol!

So, with the same amount of power (Gunpowder, or in Nerf's case, air), the smaller projectile will go further. Well...Not really smaller. The one with less mass. But since we all use FBR for our stefans, generally, the smaller one has the smaller mass.


A tank round shoots farther than a pistol since it has more accelerant than a pistol.

So, if we go back to Nerf: A stefan shoots farther than the Titan missle because it has less mass, and is imparted with the same power. So... No, bombs/larger projectiles should not get better range than smaller ones, unless they also have a better/more accelerant than the smaller projectile.

Given one gun as a constant, when that gun fires a micro stefan, it will get better range than a mega stefan, which will get better range than a jumbo, which will do better than a mongo, which will do better than an over-the-barrel type of missle.

The only way to make a bomb get better results than a stefan is to have a more powerful air source for the bomb. So given any one constant air source, stefans will always out-range big-ass missles.





Sincereley,
Pat

[LastManAlive]

Tecnically, it's that fact that there is more force behind the round. If you shoot a pistol round, with the asme amount of force (oh say the same amount of powder in a tank shell), then it should travel as far as the projectile holds up, and doesn't disintigrate form the heat of the powder.

Also note, that most tank rounds that make such a distance, are not just a large hunk of metal. Most tank rounds devide into small sections and project smaller rounds with momentum or another explosion. These small rounds may not be as accurate after another foce acting, but the tank round itself should be in range of the target.

In this case, there is not added force after the shell is fired, so the shell has no other force to propell another porjectile or itself.

[pat 1st Lt]

In this case, there is not added force after the shell is fired, so the shell has no other force to propell another porjectile or itself.

And that, my friend, is one of innumerable reasons people hate comparing Nerf with Firearms, Paintball guns, or Airsoft guns. The only comparative thing the NIC has to look to for physics lessons in large projetiles is the Spud-gun community, which is largely combustion based.

Oh, and just because this is sort of a de-railment from the original thread and I don't want to see it locked: I'd love to see some prototype Nerf Fragmentation Munition-Launched. That'd be very, very cool to see in action.




Sincereley,
Pat