Trouble getting enough thrust

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DavidLiverpool

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Jul 16, 2019
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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.
 
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.
 
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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