Trouble getting enough thrust

Discussion in 'Beginners & Educational Programs' started by DavidLiverpool, Jul 16, 2019.

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  1. Jul 16, 2019 #1

    DavidLiverpool

    DavidLiverpool

    DavidLiverpool

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    Hi, new to model rockets. I have been experementing with Potassium nitrate and Sugar engines, I have the engine firing fine but cannot get enough thrust to get lift off. I have a
    Core through the middle of the engine. Does core diamater matter? Any help or suggestions with getting enough thrust will be greatly appreciates.
    Thanks.
     
  2. Jul 16, 2019 #2

    Zeus-cat

    Zeus-cat

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    We don't talk about homemade motors in the open forum. You need to have a L1 or higher High Power cert, be a US citizen and be in the US to access the area where this is discussed. Sorry, that is the forum policy.
     
  3. Jul 16, 2019 #3

    DavidLiverpool

    DavidLiverpool

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    Having trouble uploading a video of my latest effort
     
  4. Jul 16, 2019 #4

    timbucktoo

    timbucktoo

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    please don't bother with video. As Zues-cat pointed out, we don't discuss home-made propellant in the open forum & since you are from the UK, you will not qualify for access.
     
  5. Jul 16, 2019 #5

    heada

    heada

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    Without giving details, yes, core diameter does matter and can effect burn rate, chamber pressure via the ratio of burning surface vs nozzle opening and a few other things. Most of the science in "rocket science" is in the motor design. If you don't understand this, you really shouldn't be making your own motors.
     

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