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Thread: Most cost effective fuel for model rocket?

  1. #1 Most cost effective fuel for model rocket? 
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    I am planning to make a model rocket, and I want to make it cost effective. I mean, which fuel would give me the most thrust per dollar? I know rocket candy, and it costs like $10 per kg of fuel. But the thrust is not very impressive, and irregularities often cause the 'solid' fuel to stop burning for a few seconds, which could be fatal in an actual flight.
    Electrolysis of water looks nice, and a lot of the gas can be produced using very little water, but the gas is required in much higher quantity(seems more effective than the 'space shuttle' to me anyways, is it?), so the size of the rocket goes up drastically, and I still do not know if the thrust is enough to lift an actual model rocket.
    Chemical rockets, I do not know much about them, nor do I like them, and nor do they seem cost effective.
    Is there any other fuel I have missed? Something that could be more cost effective?
    Also, I have an idea. Lets say I get a weather balloon, and send a satellite through it. When I reach the burst altitude, if I deploy a rocket using one of these fuels, could I make it go any higher, and potentially, into a low earth orbit(The air is very thin, and it makes it difficult to go up, thats all I know)? I know it sounds stupid, but if it works, imagine the millions of dollars we would be able to save.
    Or, as the air around where the weather balloon takes us is ionized, could we take advantage of that and make a propulsion system that uses this ionized air?
    Thanks in advance.


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  3. #2  
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    It really depends on how much power you're trying to achieve. Cheapest is compressed air if you just trying to reach 50' for example. The home rocket reloads that use solid fuel are pretty inexpensive, relatively safe, available at Wallmart and can be adapted to many projects.

    Most weather balloons will get you about 10 miles up; you'd still need 90 more miles before getting to low-earth orbit. It helps but not by much.


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  4. #3  
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    50' is the height? I built some rocket candy today, but I dislike it, I just dont know why. I mean, its pretty fun to watch it burn, but otherwise I dont like it. I did not find anything by the name of rocket reload on walmart.
    What would be the cheapest way to get to 100 miles?
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  5. #4  
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    Quote Originally Posted by dhamaniasad View Post
    50' is the height? I built some rocket candy today, but I dislike it, I just dont know why. I mean, its pretty fun to watch it burn, but otherwise I dont like it. I did not find anything by the name of rocket reload on walmart.
    Perhaps some tyrannical states restrict them...in most liberty loving states solid fuel motors for toy rockets are found in every toy department.

    What would be the cheapest way to get to 100 miles?
    If you figure out a cheap way to get to 100 miles (low orbit), you'll be a rich.
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  6. #5  
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    So what is the cheapest method now? I think I need to find a way now :P
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