How do I calculate the apogee of a rocket before launch?

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Discussion Overview

The discussion revolves around calculating the apogee of a rocket prior to its launch, focusing on theoretical approaches and practical considerations for a summer project. Participants explore the factors influencing rocket height, including thrust, air resistance, and rocket design.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant inquires about an equation to estimate rocket height without considering air drag, seeking a simple solution for a project.
  • Another participant argues that there is no simple equation due to the dependence on multiple factors, emphasizing that ignoring air drag is unreasonable and that knowledge of the thrust curve is necessary.
  • A similar viewpoint is reiterated, highlighting the complexity of the calculations and suggesting the use of online calculators for model rocket height.
  • One participant suggests that modeling the flight with a differential equation could be a way to determine maximum height, indicating that numerical solutions may be required.
  • A link to a research paper is provided, potentially offering further insights into the topic.
  • Another participant stresses the importance of considering air resistance, vehicle weight, thrust, and acceleration as critical parameters in the calculations.

Areas of Agreement / Disagreement

Participants generally agree that calculating the apogee is complex and that air resistance cannot be ignored. However, there is no consensus on a specific method or equation to use, and multiple competing views on how to approach the problem remain.

Contextual Notes

Participants note the limitations of simplifying assumptions, such as ignoring air drag, and the need for specific knowledge about the rocket's design and thrust characteristics. The discussion reflects varying levels of complexity in the proposed approaches.

Who May Find This Useful

This discussion may be useful for students or hobbyists involved in rocketry, particularly those interested in the theoretical aspects of rocket flight and height estimation.

Matt-STIPA
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Is there any equation in order to know how high my rocket will go, before launching it? I suppose that if there is any, it will not take into account air drag and others, and there is no need for that. I just one to know an approximate, I am making a summer project with some friends and we had this question. Thanks in advance.
 
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There is not a simple equation, because the answer depends on many factors, ignoring air drag is not a reasonable assumption, and one needs to know the thrust curve also.

Do a search for

online model rocket height calculator
 
Dr. Courtney said:
There is not a simple equation, because the answer depends on many factors, ignoring air drag is not a reasonable assumption, and one needs to know the thrust curve also.

Do a search for

online model rocket height calculator
Complex equation? I wanted to present this project to a local organisation and the demonstration of the process had to be shown and we would like to have these sort of calculations done on our own...
 
Yes, but you have to know your rocket. In general, you can model the flight with a differential equation, solve that (worst case: numerically), and then find the maximal height.
 
ok, you can't just ignore air resistance to fly (drag force) since its is one main paramerer in addition to vehicle weight, trust force and vehicle accelaration(its mustly defened on type of engine and design choice).
 

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