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About RoadRunnerAerospace

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    Cant actually play guitar

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  • Location Space... I guess?
  • Interests Physic, aerospace, astronomy, R/C aircraft, model rockets, General aircraftery

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  1. RoadRunnerAerospace

    Thread to complain bout stuff

    What just happened here
  2. valveless
  3. Keep making cool ideas and concepts, love the 3D pulse jet especially!

  4. thats funny, im using epoxy for my pulsejet, which isnt quite as extreme, but its just interesting
  5. RoadRunnerAerospace

    3d Printed Pulsejet Project

    I would have never thought that epoxy was exothermic, I'll have to look further into it
  6. RoadRunnerAerospace

    3d Printed Pulsejet Project

    Yeah was is looking like the best idea, baking would also harden the epoxy
  7. RoadRunnerAerospace

    3d Printed Pulsejet Project

    I think I'm rolling with the epoxy mold idea (I did a couple calculations off paper too if you're wondering where I got those numbers
  8. RoadRunnerAerospace

    3d Printed Pulsejet Project

    That is a very good idea, it's sort of like carbon fiber if you really squint
  9. RoadRunnerAerospace

    3d Printed Pulsejet Project

    OK so if someone can "sanity" check me that would be great. The thrust caused by a pulse jet is of course, the pressure acting against the walls, etc. So if I were to make it small, and I mean like, 5 inches long, could I possibly reduce the required pressure for combustion/thrust, and therefore heat? I know it works that way with rocket engines (in a perfect world), and pulsejets use a variant of the DeLaval nozzle. As of current i'm looking at a safe run time of 1 minute at 124°c/minute, so at 2 minutes I'll be exceeding maximum operational temperature of the plastic, through the insulating epoxy (Quiksteel), and melt the extrusion material. I'm wondering if during the mixing process I can put some insulator in with the quicksteel to decrease its thermal conductiveness.
  10. RoadRunnerAerospace

    3d Printed Pulsejet Project

    if anything it'll be quite fun
  11. RoadRunnerAerospace

    3d Printed Pulsejet Project

    nah I've used it on model rocket engines :edit: I've started work on the calculations
  12. RoadRunnerAerospace

    3d Printed Pulsejet Project

    I'm not saying its easy, but if I can get the temp within 300 degrees of the melting temp of the extrusion material, I can use gasket sealant used in cars to cover the inside of the pulse jet, maybe more if I can find a better insulator, I'm keeping flight times low for this exact reason, eventually it will melt, I just want to make it usable before it does
  13. RoadRunnerAerospace

    3d Printed Pulsejet Project

    Valveless, I think I can tweak the mixture to reduce temp
  14. RoadRunnerAerospace

    3d Printed Pulsejet Project

    Hand tools, drill, hammer, and the likes. I can get to a 3d printer at school. The plastic would be easier to manufacture labor-wise, but it would be a little more complex to insulate from the heat
  15. RoadRunnerAerospace

    3d Printed Pulsejet Project

    So I was thinking (in the middle of german class), somehow I got from how much I wanted out of there to pulsejets. From there I started to go through ideas of possibly making my own pulsejet, eventually leading me to the question: can I 3d print a functional, and integratable pulsejet for R/C models, etc? The short answer is sort of, yes. The biggest problem with the entire concept is cooling it. I'm saying that a 5 minute run time with throttle to the firewall, preferably 10 at 3/4. SO, after thats out of the way, lets get "technical". PROBLEM 1! Cooling - Pulsejets get hot, like, really hot, so I need to figure out how to insulate the plastic from the extreme temperatures from the combustion PROBLEM 2! Pulsejets are weird, they "pulse" the fuel flow to allow the suction/blow of a normal running pulsejet, I want to keep the jet simple, I.E. no computertrons beep-bopping around with timers, mainly because I cant code. Current progress is stuck at how to insulate the 3d-printed structure from the heat, however I'm formulating an idea, and I'm not great at cad.