Trouble getting enough thrust

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.
 

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.
 

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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