Curiously, the controls on the radio are labeled not in Cyrillic characters, but in the Latin alphabet, suggesting the radio was to be used by a native German speaker. It was found close to a path in the woods and not far from several sites of interest to Cold War-era spies. While searching for artifacts from a Roman empire settlement, the archeologists found a pit containing the Soviet R-394KM transceiver, built in 1987 and apparently buried shortly thereafter without ever being used. Talk about buried treasure: archeologists in Germany have – literally – unearthed a pristine Soviet spy radio, buried for decades outside of Cologne. But that doesn’t mean it can’t be done by suitably ambitious hackers.Ĭontinue reading “3D Printed Swirl Rocket Injector Turns Up The Heat” → Posted in Parts Tagged 3d printed, combustion, injector, rocket, V-2 Turning a big flame into a useful means of propulsion is where things get tricky, almost as though it’s rocket science or something. To be clear this is not a rocket engine, and it produces no appreciable thrust. That said, he does hope to eventually fit these injectors into some kind of combustion chamber, which is where things will start getting toasty. To be on the safe side has printed the part in PETG at 100% infill, but in reality the flame front is far enough away that temperature isn’t much of a concern. Since the injector only touches the fuel and air prior to ignition, it doesn’t need to be particularly heat resistant. Originally developed in the 1930s, so-called “swirl injectors” of this type were one of the key technological advancements made by Germany’s V-2 rocket program. This promotes more complete mixing, which in turn leads to a more efficient burn. The internal passages of the injector have been designed in such a way that fuel (91% isopropyl alcohol) and air are spinning in opposite directions when they meet.
A cloud of highly atomized alcohol from the injector. As you can see in the video at the break, it’s certainly capable of generating some impressive fireballs. After nearly a dozen different prototypes, he’s come up with a printable injector design that atomizes the fuel and combines it with pressurized air at a suitable ratio for combustion.
Taking the process one step at a time, has been working on a 3D printed injector that tackles the first half of the problem. It’s just that doing it in the real-world and keeping the whole thing from exploding for long enough to do some useful work is another story entirely. All you need to do is spray your fuel and oxidizer into the combustion chamber at the proper ratio, add a spark, and with a carefully designed nozzle you’re off to the races. But, I still thought I needed something else.Conceptually speaking, a liquid propellant rocket engine is actually a very simple piece of hardware. Now, it’s really looking good, as if my Rocket Ship is ready to blast off. I cut the felt in flame shape and sew them under the edge of my triangle. And, I used 3 color of felt, orange, yellow and red for my Rocket Ship’s flame. Then, I cut some left over car shade pieces into triangle shapes, so I could sew up the triangles around the body of my Rocket Ship. And sewed some green color felt to make the wings stand out. And sewed them on each side, right under the arm hole. This way, I think it’s more cool, not just simple looking holes.įor my Rocket Ship’s wing, I cut the same car shade into 2 long triangle shapes. Then I cut some blue felt in circle shape and cut the circle into 3 (total 4 pieces on each hole), so I could sew them around the holes. I covered the top of the Rocket Ship in 2 color felts, light green and dark green.Īfter sewing up the Rocket Ship foundation, I had my son dressed it up, so I could measure on where to cut the hole for his face and arms. I cut the silver shade into the Rocket Ship base, a rectangular shape, and a cone shape, for the Rocket Ship’s top. I have those silver car shades which had been sitting in the garage for long time, and it came in handy now, for my Rocket Ship’s body foundation. I pretty much used all the stuff that I could find at home. I spent about 3 nights to make my older son’s Rocket Ship. I older boy is 3 and he loves Rocket Ship so I decided to make him a coolest Rocket Ship costume because it’s more fun and special. So, I will try my best to describe how I made my son’s Halloween costume. Firstly, I would like to apologize for my English writing skill.
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