Question about home-made ballistic gel.?

If I made homemade ballistic gel using gelatin and this instructable: https://www.instructables.com/id/Ballistic-Gel/ When the gel is done, will it melt at room temperature?  Does it have to be kept cool even when using it? Thanks.

Question by pennsteve 9 years ago  |  last reply 9 years ago


Balistic tips or Spears for a Torpedo?

I don't know what to use. Should I use tips that explode or tips to spear. The torpedo I am currently making is made for ballistic tips but which should I use?

Topic by DELETED_outdoorsman2014 11 years ago  |  last reply 8 years ago


How do you make a complicated, fully automatic pen gun that fires BB's?

     Looking from all pen gun instructables, none is trully fully automatic. I came up with the idea of turning a small crank to pull the firing mechanism then release repeatedly. It's kinda' like a gatling gun. But at my disposal are a few HBW pens and no available nor acquirable Bic pens which are wide enough for BB's. I know how to widen HBW pens for BB's but then it's labor intensive. I need another solution. And by the way, people keep talking about loading up a pen with a gravity feed then blowing as hard as I can through the input hole 2, and BB's would spray out the business end. It appears everything here is too simple, so title changed! Don't give me the previous described method.

Question by nutsandbolts_64 9 years ago  |  last reply 7 years ago


How do you make a bust mold for a head? can i fill it with ballistics gel? Answered

I want to make a cheap martial arts dummy with ballistics gel covered with plastic.  like this www.punch-bag.org.uk/images/century-bob-body-opponent.jpg

Question by pufferfish9108 8 years ago  |  last reply 8 years ago


Which would be better for a makeshift crossbow, thick rubber or laminated bamboo?

     I was going to make this instructable on another sort of paper crossbow, because I promised that I would make a new version of it. But then I just decided to make a real crossbow. And so it got me thinking; should it be laminated bamboo or just a piece of rubber.      I know it will be very strong if I used laminated bamboo, but then again my hands are weak so I'm gonna' have to improvise a windlass for that. I'll have to do the same if I use really thick rubber. If you have any other suggestions for my ballista looking future crossbow, then bring it. I don't want to lose my hands while making and operating this thing.

Question by nutsandbolts_64 9 years ago  |  last reply 9 years ago


Can the pressure of an input water source in a laminar flow setup be variable? Answered

I.e. Can I change the total ballistic traveling distance of the water stream by lowering/raising the water pressure into the laminar flow nozzle assembly? I can't seem to find any theory/equations regarding laminar water flow and how pressure fits into its creation. Thanks for any help everyone!

Question by kidiron 8 years ago  |  last reply 8 years ago


Fake Bones And Organs For Ballistics Gel Dummy

I want to make a ballistics gel dummy to test assorted weapons from video games on. Like pipe wrenches, crowbars, hammers, and kitchen knives. To do this I want realistic fake bones and organs to simulate the damage the weapons would cause to those. How would I make them?

Topic by creepy0000 2 years ago  |  last reply 2 years ago


how do you make body armor?

How do you make ballistics Armour plates similar to plates used in the military for personal home protection. Is there a material I can purchase over the counter that would be light weight and have similar ballistics protection?

Question by 10 years ago  |  last reply 2 years ago



Rocket help? Answered

How can I build a high powered rocket? It needs to be cheap and i also need help on california san jose high powered rocket laws.

Question by lockpick 8 years ago  |  last reply 8 years ago


My username changed by itself ????

Hey, I don't know if my computer is haunted or something but my user name has changed without me doing anything. I've been a member since 2008 and my user name always been the same. Last week or so, a friend of mine told me about a post he made on instructables called ballistic bubble. I searched the topic, looked at it and logged off. This week, I can not log into my account, after asking for a password reset I noticed that the user name associated to my account had been changed to ballistic bubble... how in heaven is that possible lol , I thought we were not able to change our user name. Anyone had that problem? Ballistic bubble Aka meagain

Topic by ballistic buble 8 years ago  |  last reply 8 years ago


(newsletter) Ballistic Gel, Fridge Alarm, Vulcan Lyre...

Sign-up for this newsletter: Welcome back! NEW! Get in the Garden Contest - Enter any Instructable with a gardening theme and win a very cool computer-controlled indoor composting machine from NatureMill! Art of Sound Contest - Share any sound or music-related Instructable in our new contest and win an incredible custom hi-fi tower set with subwoofer or monster speakers! Get the LED Out! Contest - Enter any Instructable that involves LEDs, and win some amazing lights from Monkeylectric! Results are up for the Mother's Day Contest and Earthjustice United States of Efficiency Contest. See the winners here and here! The SteamRoller Riding Contraption Table for Electronic Dreams Make Traditional Baguettes by Hand Build Custom Speakers - Art of Sound Contest Win a high-tech computer-controlled composter and easily turn scraps into soil! Simple Metalworking Techniques ValveLiTzer Guitar Pedal Redux Make a Fridge Alarm to Catch Thieves Powder Coat a Bike Frame with Logos Ballistic Gel Use Sculpey on a Vinyl Toy Solar Light Up Rock Stairwell Pita Pizza: The Five Minute Snack Share your best LED creations! Win these custom hi-fi speakers! Acoustic Vulcan Lyre Crutch Chair Fortune Boat Lamp Make a Fiberglass Speaker Enclosure Sign-up for this newsletter:

Topic by fungus amungus 9 years ago


Where can you get silicone gel that can be easily molded that does not degrade over time?

I need some kind of gel padding for an underlayment on a suit of non-ballistics body armor I am building. What I want is some kind of mixture I can mix up, dump in a shallow mold, let it cure, then pull it out and cut it to shape and put it in the suit. Preferably this gel would be pretty good at absorbing shock and would not degrade over time if kept in a sealed environment away from sunlight, like sealed in a plate in the suit.  Anyone know of anything like that that is easily available and not over priced? I noticed the silicone used to make molds for casting, would that work? My friend suggested ballistics gel but it seems like it would degrade over time.  Any suggestions would be greatly appreciated. 

Question by ilpug 7 years ago  |  last reply 6 years ago


How do I make a mold for a severed arm on the cheap? Answered

I am trying to make a mold of my arm for Halloween, I am going to use ballistics gel for the actually mold itself

Question by Claypoolgal 8 years ago  |  last reply 5 years ago


potato cannons

Hey, just wanted to see everyone's potato cannon designs. please post yours and I will post mine. a great instructional book on how to make these can be found at your local library, called backyard ballistics.

Topic by nerfer 9 years ago


Where can I find PET recycled fabric?

I'm looking to make a messenger bag and a few other things, but instead of buying new ballistic nylon fabric, I want to get PET fabric. Where can I find this sold by the yard?

Question by sarahfish 9 years ago  |  last reply 6 months ago


Homemade SAPI Plates anyone? Answered

So i just bought a bunch of new tac gear, but mainly a new plate carrier and a bunch of pouches. and while i was out there runin around out there feelin legit, i noticed that with all my gear, the vest kinda flops around without any plates. so im too lazy and cheap to buy a $30 useless hunk of square plastic that no one is ever going to notice, and i wondered, why not homebrew it? so if ANYONE has an instructable or knows how to make fake SAPI "ballistic plates" PLEASE reply...PLEASE          UPDATE- some people seemed to get the impression that im using this for real steel purposes. i can see why they would think that, since i was a bit vague on that part of the question. HELL NO. i will be using this for AIRSOFT. those are 6mm plastic bbs flying at speeds of 350 feet per second maximum. so just about anything works. and im wearing eye protection. so no one is shooting their eyes out either.

Question by predatory meatball 7 years ago  |  last reply 6 years ago


how can i get away with stab proof armor in Australia

Long story short, in melbourne australia i have organised a group called citizen patrol group we basically patrol trains, buses, streets etc and help people in need and remove the trouble makers we do this in super hero costumes (not as silly as it sounds we are creating a character worth looking up to and bringing innocence back to children through good old fashioned super heroes) my problem is we are aware it can be dangerous but commercially made ballistic vests are illegal in my country i want the best protection for my team mates and am looking for GOOD QUALITY methods of creating one or if there is a legal loop hole that will allow us our right to protect our bodies.

Topic by Winter Wolf 7 years ago  |  last reply 2 years ago


Light(ish) and non flexible.

I am toying with the idea of putting together a non flexible notebook case. I really liked the look of my Timbuk2 sleeve and other sleeves out there, but they always leave out adequate support to prevent flex when in a messenger bag. I am pretty sure that being flexed across my back while cycling with a good amount of weight pressing on it killed the motherboard (twice!) on my old notebook and would like to avoid it again. I need some materials suggestions though. I need a non-flexible material to act as plates to be sewn into the outside covering of the case. Ceramic plate would be ideal, but the things that I have found are anti-ballistic and ridiculously expensive. Plate steel would work but it is heavy. Anyone out there with experience with plate steel or aluminum that can tell me how thin I can go without flex, or maybe some advice on materials that I haven't thought of?

Topic by triplenine 12 years ago


Is this on the markety already? (Man over board localizer)

MAN OVER BOARD LOCALIZER The system consist of a ballistic launched lifesaver with a flag and dye marker combined with an alarm. The system is simply a can of pressurized air that is being rapidly released (or an automotive airbag explosive unit), pushing a lifebuoy into the water, towards the person in the water. Additional features: The system should also have a high flag or maybe even a balloon, making it easier for both the person in need of rescue to swim towards it and for the boat to find “the spot” where the person fell overboard. This is harder than it seems, especially far off shore, where one square mile of water may look very similar to the next one. A slow releasing dye marker for the same reasons -also makes it easier for air rescue to find the spot. For big ships, a control panel that asks you to point the “lifebuoy barrel” towards the direction where the person in need of rescue is. This way, the ship would have six units pointing in all directions. Pushing the control button should also sound an alarm GNU License by Einar Kramer

Topic by Ranie-K 9 years ago  |  last reply 9 years ago


Why doesn't my potato cannon work? Answered

Today, I finally got to test my spud gun. I loaded it up with a plug of potato, sprayed in one second of hairspray, twisted the cap shut, and pressed the barbecue ignitor. I heard the ignitor work, but nothing happened. I tried this again and again, using different potatoes, cleaning the cannon, and checking the sparker. Every time I did it, it didn't work. I followed the instructions step by step from Backyard Ballistics, but I used ABS instead of PVC. I also used a barbecue ignitor instead of a lantern ignitor. I used all ABS parts, with the right cement for ABS, so I don't know what went wrong. Could it be my hairspray? I bought a $1 can, which seemed a little strange, because all the other cans were at least five dollars. Is cheap hairspray made with different chemicals? I believe the hairspray brand I used was called "White Rain", but I could be completely making that up.  Thanks, Noahh 

Question by noahh 9 years ago  |  last reply 5 years ago


UPDATED: I am having difficulties deciding which book to pick from AMAZON

I will get a list of the ones I am considering at the moment soon, and would like suggestions from you all too. Ok, here is my list; I want to pick one of these, OR if someone has a better suggestion....let me hear it:   Backyard Ballistics: Build Potato Cannons, Paper Match Rockets, Cincinnati Fire Kites, Tennis Ball Mortars, and More Dynamite Devices by William Gurstelle Whoosh Boom Splat: The Garage Warrior's Guide to Building Projectile Shooters by William Gurstelle Adventures from the Technology Underground: Catapults, Pulsejets, Rail Guns, Flamethrowers, Tesla Coils, Air Cannons, and the Garage Warriors Who Love Them by William Gurstelle MAKE: Electronics: Learning Through Discovery [Paperback] Charles Platt Getting Started with Arduino (Make: Projects) by Massimo Banzi Practical Arduino: Cool Projects for Open Source Hardware (Technology in Action) by Jonathan Oxer 30 Arduino Projects for the Evil Genius [Paperback] Simon Monk 51 High-Tech Practical Jokes for the Evil Genius by Brad Graham Mechatronics for the Evil Genius: 25 Build-it-Yourself Projects by Newton Braga 123 Robotics Experiments for the Evil Genius (TAB Robotics) by Myke Predko 22 Radio and Receiver Projects for the Evil Genius by Thomas Petruzzellis The Geeks' Guide to World Domination: Be Afraid, Beautiful People [Paperback] Garth Sundem Illustrated Guide to Home Chemistry Experiments: All Lab, No Lecture (DIY Science) by Robert Bruce Thompson Chemical Magic by Leonard A. Ford The Best of Make (Make 75 Projects from the pages of MAKE) by Mark Frauenfelder Theo Gray's Mad Science: Experiments You Can Do At Home - But Probably Shouldn't by Theodore Gray BTW:  I have the one pictured, and actually am not pleased with this particular one.  Which is why I am being cautious....

Topic by Goodhart 8 years ago  |  last reply 8 years ago


Deriving the maximum range and angle of a projectile

In a thread in the Green group, AnarchistAsian and I were discussing his coil guns. I posed the question of what range he could get, and he asked me to go through the physics derivation. Here it is, simplified to require just algebra and trig.The kinetic energy of the projectile E = ½mv2, gives v = sqrt(2E/m) as the speed at launch. Let θ be the angle at which you launch (θ=0° is horizontal, θ=90° is straight up). Then you can decompose the speed into two components: vh = v cos(θ) is the horizontal speed,vv = v sin(θ) is the vertical speed.Gravity only pulls vertically, so the projectile's vertical speed will be slowed down until it reaches its maximum altitude, then it will fall back until it hits the ground. The horizontal speed will remain constant until it hits the ground and stops. To figure out the range, you need to know the time t that the projectile flies before it hits the ground; then the range is just R = vhtEnergy conservation guarantees that it's downward speed at the end is equal to its original upward speed, just with a change of sign. That also means that the total flight time of the projectile will be half going up and half going down. Once you determine how long it takes to reach the top of its flight, you're done; just double that answer :-)In the vertical direction, the maximum heightH = vvt - ½gt2(you need calculus to derive this result). From energy conservation, the initial kinetic energy in the vertical direction, Ev = ½mvv2 must equal the potential energy at the top of the flight, Pv = mgH:mgH = ½mvv2H = ½vv2/gSubstitute this on the left hand side of the trajectory expression,½vv2/g = vvt - ½gt2vv2 = 2gvvt - g2t2vv2 - 2gvvt + g2t2 = 0(vv - gt)2 = 0vv = gtSo, t = vv/g = v sin(θ)/g is the time to reach maximum height. Double that as discussed above, and you get the range R = 2 sin(θ) cos(θ) v/g.Work out the angle that gets you maximum range by just plugging in different angle values and finding the one that is biggest.

Topic by kelseymh 10 years ago  |  last reply 9 years ago


Legality of putting airsoft gun into a real gun conversion kit??

Hey Instructables, I have a question about the legality of a project that I'm designing, as I don't want to make something illegal. As those who follow me on this site know, I play a lot of airsoft. I've recently been trying to design a new kind of airsoft rifle, and I would like a bullpup design (the magazine well is located behind the trigger to make a shorter gun). I was looking around on the net and I found this http://www.mountsplus.com/AR-15_Accessories/AR-15_Scope_Rings/MZ-1022.html   It's a bullpup conversion for your standard Ruger 10/.22 rifle. i checked the legality of this conversion for the state I live in, California, and found that it IS in fact legal, as long as you only use a 10.22 in it, don't use an automatic, your magazine contains 10 rounds or less, and the barrel over 18 inches, with an overall gun length of 25 inches. Normally bullpup guns are illegal in California, but since the 10/.22 is a rimfire instead of a centerfire, and the ban only applies to centerfire guns, this conversion falls into a neat loophole, and is legal for sale on a normal license.  HOWEVER: I don't plan on putting a 10/.22 in this thing, I plan on tearing out all the internals of the conversion rendering it permanently effectively useless for a real-steel gun, and building a field-spec airsoft gun system inside it, making it basically a nonlethal toy for sports like any other airsoft gun. The final design would be built to the legal specs of a airsoft gun in the united states, with an orange barrel tip and a non-ballistic caliber.  I can even make the final gun fit into the real steel size requirements if that would help the legality. Basically, I don't know if this is legal or not, and haven't been able to find it online. As far as I can figure, it would be legal because the conversion kit counts as a STOCK, rather than a receiver or firearm in and of itself, so that gives a lot more leeway I would think.  I just want to be doubly sure before I begin this project, due to the heightened paranoia over guns and gun laws at this point, I don't want to be thrown in jail for making a toy. 

Topic by ilpug 5 years ago  |  last reply 5 years ago