ArthurSull
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Is it when the motor/engine is completely spent or when the motor engine has reached it's peak thrust?
Is it when the motor/engine is completely spent or when the motor engine has reached it's peak thrust?
The offical NFPA 1125 specification is when the thrust drops down to 5% of the peak value.
John
For example some propellants and motors, such as a fynocl with a moderate burn rate, will have a longer trailing tail of burnout. A bates will just shut down, with maybe a crackle or puff.
Not necessarily. Here's a finocyl thrust curve (with a moderate burnrate): https://pro38.com/products/pro150/motor/images/29920O3700-P.pdf
Here's a bates: https://pro38.com/products/pro54/motor/images/2833L805-P.pdf
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