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Thank You,

- Thread starter uzt
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- #1

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Thank You,

- #2

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Also, you need to make some effort on your own. On this forum we don't spoon feed answers, we expect you to have shown some work of your own before we can jump in with help. Do you know any relevant equations to help towards your answer?

- #3

berkeman

Mentor

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Also, are you part of a rocketry club, or do you have an in-person Mentor to help you with this and make sure your work is safe?

Thank You,

- #4

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Hi, thank you for your answer.

Also, you need to make some effort on your own. On this forum we don't spoon feed answers, we expect you to have shown some work of your own before we can jump in with help. Do you know any relevant equations to help towards your answer?

First of all, I tried to determine the regression rate of given propellent to obtain mass flow rate and then trying to obtain thrust from the formulation of;

T=m(dot)*Ve+(Pe-P0)*Ae, where m(dot) is mass flow rate, Ve= velocity at exit of the nozzle, Pe=Pressure at exit of the nozzle, P0=Free stream pressure, Ae=Area ratio of throat to exit.

But, then I realized that determination of the regression rate of the propellent is not easy. I faced several problems such that obtaining mass flow rate, and then I tried to calculate as projectile motion with the consederition of air resistance on particular body, but again I faced the problem which is coefficient of drag for this particular body. Then, I found a web site which contains several equations about maximum altitude and velocity of model rockets. Here is the site

-> http://www.rocketmime.com/rockets/rckt_eqn.html#Theory

but, I do not know the formulas are true or not because there is some untitled variables which is not understandable at all.

So, my question is what should I do. Am I doing right or not? How can i calculate the mass flow rate or is it possible to calculate with these given information? Also, if you know any relevant books or articles about rocket propulsion, I am glad to hear.

- #5

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I am not a part of a rocketry club or something. Just trying to build by my own with help of the book Fundamentals of Aerodynamics by John D. Anderson.Also, are you part of a rocketry club, or do you have an in-person Mentor to help you with this and make sure your work is safe?

- #6

anorlunda

Staff Emeritus

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@berkeman 's question was more of a hint. Doing it on your own may expose you to risk of injury. Model rocketry with the help of a local club is safer and is recommended whenever possible.I am not a part of a rocketry club or something. Just trying to build by my own with help of the book Fundamentals of Aerodynamics by John D. Anderson.

Edit: @phinds ' post was also a hint to bring your questions to a rocketry forum. Discussing dangerous topics on PF is not allowed.

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