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Model rockets

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  • Model rockets

    Have anyone tried this? Seems an easy way to replica ballistic missiles firing from ballistic submarines.

    https://youtu.be/YFah0rQD2jg
    Thinking of building the 1/144 Typhoon in 3D from Bob, which has the optional hatch openings for firing the missiles... maybe just a surface model to keep it simple.



  • #2
    Tricky! As even the smallest Estes rocket motor will burn a big hole through your ship!!! Way too high a damage/failure rate!!! But, hey, you got the nuts, go for it!!!

    Comment


    • #3
      My friend tried this method when we did the experiment together. We 3D printed the missile and used O-rings at the bottom to seal it to prevent water from getting inside the missile. The principle is also very simple, the knowledge of junior high school chemistry class, using static electricity to ignite a mixture of ethanol and air, the resulting gas propulsion is powerful. Do not worry that this will explode, because this is actually the use of gas as propulsion, the heat generated is instantaneous and short-lived. Note that water, being an incompressible liquid, is best kept out of the gap between the missile and the launch tube, or it will have a large impact on the inside of the tube at the moment of launch. You can either keep the outer wall of the missile close to the launch tube, or install an O-ring on the head of the missile to prevent water from entering the gap.

      V

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      • #4
        Originally posted by Sam Victory View Post
        My friend tried this method when we did the experiment together. We 3D printed the missile and used O-rings at the bottom to seal it to prevent water from getting inside the missile. The principle is also very simple, the knowledge of junior high school chemistry class, using static electricity to ignite a mixture of ethanol and air, the resulting gas propulsion is powerful. Do not worry that this will explode, because this is actually the use of gas as propulsion, the heat generated is instantaneous and short-lived. Note that water, being an incompressible liquid, is best kept out of the gap between the missile and the launch tube, or it will have a large impact on the inside of the tube at the moment of launch. You can either keep the outer wall of the missile close to the launch tube, or install an O-ring on the head of the missile to prevent water from entering the gap.

        V
        Great info there!

        Yup, sealing the missile compartment away from water will be the greatest challenge for subs. Thus reason why just build a rc surface sub for this purpose whereby building a waterproof front compartment for this purpose.

        ​​​​​​​Do you think nitro fuel can be used for the propellant as it contains methanol?

        Second challenge is how to make sequencing firing of 6 missiles one by one... is it a must to have 6 channels to do it?

        ​​​​​​

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        • #5
          Too bad pyrotechnics are banned in Singapore.
          Make it simple, make strong, make it work!

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          • #6
            Originally posted by mloo123 View Post

            Great info there!

            Yup, sealing the missile compartment away from water will be the greatest challenge for subs. Thus reason why just build a rc surface sub for this purpose whereby building a waterproof front compartment for this purpose.

            ​​​​​​​Do you think nitro fuel can be used for the propellant as it contains methanol?

            Second challenge is how to make sequencing firing of 6 missiles one by one... is it a must to have 6 channels to do it?

            ​​​​​​
            You shouldn't use compounds with nitro, these are the raw materials used in the production of fireworks , toxic and dangerous. Medical alcohol at home is the perfect propellant fuel, which produces only carbon dioxide and water when burned, and is harmless to humans. As for your comment about how to launch your missile, this is not difficult either, all you need is an electronic ignition module, connected to your receiver with a dupont wire, so the launch module will only take up one channel of your receiver. You toggle the transmitter's 2-way switch, the launch module will output high voltage to the "ignition needle", and the static electricity generated will launch the missile. Theoretically you can launch as many missiles as you want, and you can design the number of channels of the launch module yourself, and it is sequential launch.

            V

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            • #7
              Hi V,

              So do you mean using those rc engine ignition starter? For that will need a min 10 Channel 2.4Ghz surface radio to do the job.

              Sounds feasible than using cigarette lighter mod in the vid, at the expenses of costs...

              ​​​​

              Comment


              • #8
                Originally posted by mloo123 View Post
                Hi V,

                So do you mean using those rc engine ignition starter? For that will need a min 10 Channel 2.4Ghz surface radio to do the job.

                Sounds feasible than using cigarette lighter mod in the vid, at the expenses of costs...

                ​​​​
                Maybe we are talking about the same thing, a simple electronic ignition module, which is actually a power electronic switch that controls the ignition as a square wave or magnetic pulse signal delivered to the signal input of the ignition module. For example, if you want to launch 20 missiles, then you need a 20-channel ignition module, but this module actually only takes up one channel of your receiver because you are firing sequentially by toggling the transmitter's 2-way switch, flipping it once to launch a missile. This ignition module is similar to the previous TCP (used to control the solenoid to fire the torpedo) module, except that the voltage and current output from the ignition module is much larger, large enough to generate an electrostatic charge. A weak electrical spark is enough to ignite the alcohol vapor, a very simple system, do not think too complicated. As you can see, this is a 16-channel ignition module.

                Click image for larger version  Name:	153ac24b9252f75c470af690307a72f.jpg Views:	0 Size:	63.3 KB ID:	161591


                V
                Last edited by Sam Victory; 05-08-2022, 08:13 AM.

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                • #9
                  Click image for larger version

Name:	Screenshot_20220508-095913_Chrome.jpg
Views:	47
Size:	73.4 KB
ID:	161593kevin McLeod rocket launch

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                  • #10
                    Interesting. So you means using the same single channel, you toggle a 2 way switch once and the module will fires once, and flipping again will fire the second output and so on?

                    Where can I find more info of that electronic switch?
                    Last edited by mloo123; 05-08-2022, 10:22 AM.

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                    • #11
                      Originally posted by mloo123 View Post
                      Interesting. So you means using the same single channel, you toggle a 2 way switch once and the module will fires once, and flipping again will fire the second output and so on?

                      Where can I find more info of that electronic switch?
                      Yes sir you understand correctly. I'm sorry I don't know where you can buy such a launch module (in your country), but such things are very common on model airplanes or ships, which you may have to find out yourself.

                      V

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                      • #12
                        Yes commander!

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                        • #13
                          Something with a spring load would be just as effective. I had a ballistic submarine toy, as a kid, that had them.
                          Of the 40,000 men who served on German submarines, 30,000 never returned.”

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                          • #14
                            One thing that's often not appreciated about rockets is how difficult it is to "right size" how far they're going to go. The shot above that Rick posted is my 1/96 scale OSCAR 2 letting off a cruise missile that's powered by a MicroMAXX model rocket motor. It's the smallest motor you can get, but it still sends those cruise missiles 300' down range. (Which makes it a challenge to know where they're going to come down.)
                            Kevin McLeod - Oscar II driver
                            KMc Designs

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