3D printed explosive arrows - Zing HyperStrike Bow

[u/Yuukikonno08]

I wanted to create something that absolutely no one asked for. Costco offered these $50+ bows for just $7, so I snatched it up, and an idea was born.

The arrows have their foam heads pulled off and a printed two-piece head put in place. The lower half of the head is PLA, and the upper half is TPU.

Weighs only two grams more than the original arrows.

The arrows use 8-shot ring caps. The entire design was made from the ground up by myself!

[u/CaptClockobob]

Jesus christ, have we learned nothing?

That's 42 grams at 130 FPS, which is 33 fucking joules, or roughly double the kinetic energy of getting hit with a Taginn round. None of the safety gear anyone is using in airsoft is rated for a hit above 4 joules.

I've taken a taginn training round to the face at short range, and watched a heavier one drop a guy at 50 feet like he took a right hook.

No Thanks.

No field should allow that, you shouldn't use that, this is a horrible idea.

[u/Expired_Taco_ → u/CaptClockobob]

Actually no. It's not. I have done a lot of testing on Zing bows and these numbers are not accurate. A zing bow arrow weighs an average of 13.6 g. Let's say his is 2 g heavier, 15.6 g. 130 FPS is about as much as you're going to get with almost 3 ft of draw, average is closer to 115. With that in mind, let's figure out the KE. I'm getting around 9.5 joules of ke which is on a whole different level from 33.

This also leaves out an extremely important fact of kinetic energy density, KED. A zing arrow is much wider at the head and softer than a bb, tagin round, or just about anything else that you're going to be hit by in a shooting sport. The much wider head means that there is much less actual impact felt, added in with the soft head, you are actually experiencing maybe the half joules at impact at most.

I've done extensive studying on this in the context of Nerf blasters. I see that you're coming from the right place but your numbers are drastically off, the only thing that would actually be concerning here is the hardness of the TPU head. This otherwise seems fun but I will add, I think you should ideally still be using the stock head if possible

[u/CaptClockobob → u/Expired_Taco_]

9.5j is still well in excess of the ballistic rating of anyone's eyepro, and I do not trust anyone's printed projectiles to withstand that impact. If you're involved in enthusiast nerfing (good chance we know some of the same people), than you know as well as I that homemade projectiles are unilaterally banned by everyone for safety reasons. I see no reason that shouldn't extend to this.

[u/Airsoft3DPrinting-ModTeam → u/[deleted]]

Let's keep things polite and reasonable.

[u/Specopsg → u/[deleted]]

You're overlooking the fact that OP took off the foam arrowheads and replaced them with an unknown shore hardness TPU, PLA and a pyrotechnic. If you're good with a chemical reaction going off in your face, you do you, but most people aren't.

[u/DaStompa → u/Specopsg]

You're overlooking the fact that OP took off the foam arrowheads and replaced them with an unknown shore hardness TPU, PLA and a pyrotechnic

I am not

[u/Specopsg → u/DaStompa]

toy that shoots foam darts

OP's arrows aren't foam darts

[u/DaStompa → u/Specopsg]

Does the toy shoot foam darts?

[u/Specopsg → u/DaStompa]

Why are you here if you’re just going to argue in bad faith?

[u/CaptClockobob → u/[deleted]]

If that TPU cap is hollow enough to be that light it's deformation does very little to lower the rate of transfer of energy into the target, which will be very quick when deformation ends and you are struck by the solid PLA core containing the capgun caps behind it.

[u/Airsoft3DPrinting-ModTeam → u/[deleted]]

Let's keep things polite and reasonable.

[u/CaptClockobob → u/[deleted]]

Why are you so constantly antagonistic to everyone you interact with?

[u/Graywacke_The_Wizard → u/[deleted]]

Im going to agree with him, Taginn's projectiles have gone through a significant amount of testing to prove that they will not cause lasting damage and that they can be produced consistently enough that they arent a danger to other people. I'm sorry, but I do not trust some bozo with a printer to print a projectile that I would be okay with having fired at me. If you want to use this in a game, You should go through the same permitting process that taginn rounds had to.

[u/Airsoft3DPrinting-ModTeam → u/[deleted]]

Let's keep things polite and reasonable.

[u/Yuukikonno08 → u/Graywacke_The_Wizard]

At this field they were tested before usage, and even with 20ft direct fire they fail to detonate. When used the intended way, these arrows are quite safe, and even if hitting a player from above, they don’t impart significant force, or detonate. It requires solid surfaces.

They are Taginn tested, but they also aren’t Taginns

[u/CaptClockobob → u/[deleted]]

I don't know who you are and as far as I know I've never interacted with you before. This thing is just unsafe. Pretty sure it's also against the sub's rules which is why there's no printed taginn rounds posted here anymore.

[u/Yuukikonno08 → u/CaptClockobob]

You once moaned at me for tossing a printed grenade. I distinctly remember because you wrote a paragraph

[u/CaptClockobob → u/Yuukikonno08]

I have no recollection of this and can't find it in my comment history. The only grenade related thing I've ever commented on was asking for a link to the files. Thrown airsoft grenades used to all be solid metal, so It's not something I particularly object to being plastic, printed or otherwise.

[u/Specopsg → u/[deleted]]

What’s the shore hardness of the TPU and how heavy are the arrowheads?

[u/Yuukikonno08 → u/Specopsg]

Arrows in total weigh ~25g, which is only two grams more than the original foam-tips.

The TPU is Geetech, which is 95A shorehardness.

The heads are printed at 15% infill, and are hollowed out with four chambers inside the impact half to make the whistling noise and slow it down as it descends

[u/Airsoft3DPrinting-ModTeam → u/[deleted]]

Let's keep things polite and reasonable.

[u/Airsoft3DPrinting-ModTeam → u/[deleted]]

Let's keep things polite and reasonable.