You can probably find one cheeper online. There is nothing really hard in this step. All I bought was the tank and a CO7 paintabll coil hose. The coil hose had a quick connect included with it which was great. I've included a link of where to buy this set up as it makes things a lot easier in future steps (although you could get away without it). Once you have both, simply connect the regulator to the tank but dont screw down the top nozzle as we dont need any co7 to come out yet. At the end with the quick connect on it, unscrew the black 8/8 fitting (meant for paintball guns) as we do not need this, it is round with a gasket on it. The 6/8 silver piece of the quick connect that is exposed once we remove this black piece will work just as well.
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The barrel is made completely out of copper. Here, you need to have some knowledge of (easy to learn if not). Once you have connected all the copper sections, connect the the 8/8 to 6/9 reducer. Although I have the hose barb pictured next, don't do that. Put a 95 degree elbow instead and leave the barrel like that. This will make it inserting it into the cannon easier later. So the only change from the picture is the 95 degree elbow instead of the hose barb and hose. Another pretty straight forward step. Put the two hose barbs in the hose, clamp down, screw in blowgun on one end. You may have to cut the hose to the right length later on so it may be wise not to insert the second barb until you know how long the hose will be. Now we attach all the fittings to the tank assembly we made in the previous step. Make sure to add the check valve, I forgot to put it in the drawing. Do not connect the barrel, blow valve or co7 yet, just make the tank assembly as seen in the first picture (I moved the check valve to right after the tee in my final version but it isn't that important. ) Use a reducing bushing to connect the cross to the gauge. If you plan on assembling this gun and not attaching it to a nerf gun as I have, this is your last step. Feel free to make whatever you want out of it. Its pretty easy to change barrel sizes and all sorts of modifications. Continue onward to place the assembly in the gun (still do not attach the barrel, blowgun, or co7 yet. )This is the I used. Sorry But I didn't take any pictures of this step. Basically you want to unscrew the whole thing and clear out any loose parts. Next, using a dremel and your own judgement, dremel out what you think will get in the way of the cannon barrel.
Once you have all of it Dremeled out and have ensured, by testing, that the barrel fits, paint it whatever color you like and let dry. I made two additional holes. Using the hose clamps, secure down the tank to the frame of the gun. Cut a small piece of 6/7 PVC to support the cross (or whatever else you have handy. You will need to make a slot for the clamp at this section. You may need to cut the hose first to be the correct length. In this step, we inset the barrel into the frame. If you haven't already, see how far the barrel goes back and drill a hole for the air to get to the barrel. The 95 degree elbow on the barrel should be aligned with the hole you made. Insert a 6/9 x6. Connect the QEV valve to the 95 bend with a section of air hose (I assume you can make a length of hose by now. You will have to forgive me but my real grappling hook got lost in the woods on a test fire. Here is my imporvised replacement that I used in the video to demonstrate the concept. If you have a real grappling hook, it will work the same way depending how heavy it is. A big factor in determining how far it goes is how it fits in the barrel. This may require the use of rubber gaskets and some light oil and some wadding. Play around until you find something that works. You have a very powerful air cannon at your hands so this is the only limiting factor at this point. The rope needs to deploy smoothly so coil it up nicely. You could add some kind of pole to go on the gun to allow a smooth deployment but I have just been laying it on the ground. Congratulations, you have finished the gun! When charging with CO7, be very careful not to overcharge.
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The safety valve should prevent pressure from building up past 675 degrees but I make no guarantees. Put very little at a time. Screw the release valve very carefully and slowly and always be ready to turn it to the left (off). I usually charge mine to about 675psi. Don't be stupid though. Be careful with it, don't shoot anybody or anything with it and never point the barrel at anything you don't want to shoot. I claim no responsibility for people being foolish while using it. I'm just curious as to why you need the fire extinguisher tank when you already have the CO7 tank. Thanks! It looks awesome! Are you actually able to climb with the grappling hook and cable once it catches onto something? Ta-da then combine themIf I were to follow your plans as closely as part availability would allow but used a larger barrel for tennis balls or t-shirts, do you think I'd have issue with distance or power? I tried to build this myself, but it won't work. I was wondering if you could build it for me. I know this defeats the purpose of this website, but I was wondering if you could do it for me. I get that the sound is one aspect to be taken into account for grappling hook guns. It is mostly used to sneak, but I would really like to ask if it would be good to use water bottle rockets to carry both the hook and the rope? Water bottle rockets have large momentum and should be able to carry a sturdy hook and stronger rope to huge distances, provided the rope supplied is long as well. Water bottle rockets would never have enough force to carry much of anything besides itselfSir, Id rather have half my monthly allowances in exchange for your badass gun but I beg to differ. Law of conservation of momentum will cause the bottle to have equal (sum of) momentum with the water thrown backwards. And we know that water is heavy and they splash very hard backwards, thus momentum forward is powerful as well. Also, people had been shooting water balloons(water is heavy) using a water bottle rocket.
I may be too young to create such a gun, but Im at the gathering-ideas phase. Http: //www. Sciencetoymaker. Org/waterRocket/WaterBalloonLaunch. Htmthe water is minimal you put in the rocket. A gallon of wate ris about 8. 88 lbs and the amount in a rocket is no where near that, more like a few ounces (as the bottles they launch are usually about 75oz and we can essentially consider the plastic massless). Although they have a high velocity, the water weight is minimal so the momentum is relatively low. However, the momentum is not particularly relevant, more of the force that is required to launch the projectile (the grappling hook). I havent done the math but the force is fairly high in order to launch a 8. 5lbs object over 85 feet at a 75 degree (or greater angle). So you could probably calculate this all out and see, compared to a bottle rocket which is esentially massless once in flight, that the two forces are greatly different. Water bottle rockets are extremely louder than this. . Then you would be soaked with water. I don't understand the purpose of having both a fire extinguisher and a CO7 tank. Why? The fire extinguisher on it's own has no pressurized CO7 inside since you emptied it. Therefore you need to add some to it, hence the CO7 canister. The CO7 in the canister is at a very high pressure (greater than 6555psi). This is too much for the launcher so only about 755psi is put into the fire extinguisher at a time which then, in turn, is used to launch the grappling hook.
Out of curiousity, what is the approx cost of this? Im a college student (NCSU engineering! ! ) and dont have a ton of extra money, but this is just awesome and i really want to make onereally depends on how thrifty you are and if you can find old parts. To build it completely new would be about $675-$675Anyone know if commercially available guns are unreasonably expensive? I'm thinking that this would make a good addition to a rescue team/firefighter tool set. Not so much for climbing but with a soft grappling hook this could be used to get ropes to people stranded in flood water, etc. Just a thought for real world application. A few kayakers I know, including myself, use the tennis ball throwers from pet stores for this. Accuracy is high, max distance is pretty consistent (and far), and the portability/reliability is unbeatable. Just punch a hole through a tennis ball, put your line all the way through the ball, tie a stopper knot (http: //en. Org/wiki/Ashley_stopper_knot) on the tail of the line and start practicing. Remember to never stand in the bight (don't position yourself where you could get tangled in the line). Also, only use line appropriate for your purpose. If you want to throw a safety line, make sure the line is a safe one (weight-tested, in good condition, etc. ), you are just throwing a service line so that the distant party can then pull the heavier rescue line across, make that clear to them before throwing, and make sure they understand. Wow hey ideas on how to make a small pistol verison small motor like mythbusters didIve never seen it but it seems like it would be near impossible at this point to make one the size of a pistol unless you could find some very strong spring or other compressible device to create a spring force of some sort. Mythbusters super hero epide also just so you know it might be posable to make it smallerPSI, volume, flow rate, and dumping rate all vs. Weight of hook/projectile. Maybe a couple CO7 carts and a good dump valve (thought the pierce hole of a CO7 cart might be the limiting factor. )If you go to www.