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  • TonyK33 commented on iamdenteddisk's instructable Homemade orbital rocket?2 years ago
    Homemade orbital rocket?

    Not only could he simply not use a phone at all... since cellular is limited to roughly 10 miles above the surface of earth. Radio would be HIS only option realistically. But then, this project is far from realistic in just about every way from the VERY LITTLE I know about space. Solar cells are more than reasonable if you plan to head to mars or just about anywhere near the sun. Hell even a few trips in the opposite direction would be fine if you could have a large enough solar array and somehow maintain an orbit somewhere to capture that light. As for David's response to the RTG. I'm not sure he would be able to acquire a beta emitter, aside from the dangers of handling it. I know very little of beta emitters but i can say that the RTG's in the voyager missions work for a hell of a lo...

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    Not only could he simply not use a phone at all... since cellular is limited to roughly 10 miles above the surface of earth. Radio would be HIS only option realistically. But then, this project is far from realistic in just about every way from the VERY LITTLE I know about space. Solar cells are more than reasonable if you plan to head to mars or just about anywhere near the sun. Hell even a few trips in the opposite direction would be fine if you could have a large enough solar array and somehow maintain an orbit somewhere to capture that light. As for David's response to the RTG. I'm not sure he would be able to acquire a beta emitter, aside from the dangers of handling it. I know very little of beta emitters but i can say that the RTG's in the voyager missions work for a hell of a lot longer than 10 years. Granted they run plutonium 238, they were still able to acquire around 450 watts of power at time of launch. It's half life is like 80 years. To put it in perspective we launched those missions in the late 70's and they don't expect total equipment failure until 2025 at the earliest. 50 years and that's NASA's safety number. If you want to orbit earth for a few minutes and drop. Build a rocket ship. If you want deep space travel... then you need to design around deep space conditions. Which means nuclear powered, and ION thrusters. Also wanted to add. The speed at which everyone is mentioning as a needed speed for orbit is not entirely correct. It's the speed required for your average LEO craft. Speed and altitude for orbit are a product of mass. Light objects, which are affected less by gravity would need less inertia (speed) to stay in orbit. Likewise, a larger distance from the earth would have a similar effect, less inertia required. PS If you had this capability. NASA would hire you. And i'm not knocking you i'm just being real. Unfortunately the average citizen just doesn't have the resources for something like this.

    Also wanted to say, though iv'e never worked on an RTG i have used Thermocouples in both TEG and TEC form. Very cool stuff, simple and easy to use.

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  • TonyK33 commented on iamdenteddisk's instructable Homemade orbital rocket?2 years ago
    Homemade orbital rocket?

    Use gravity :) Suspend 4 wires below the balloons to a central hanging weight. Might keep a center section stable enough. It would act like a pendulum in the air, and regardless you are correct it would still be quite unstable. Not nearly stable enough to calculate a trajectory for which to exit the atmosphere.

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