RocketPy

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Allow RocketPy to run a point-mass simulation (3DOF).

Important aspects of this issue:

• You should modify the flight class to add an option to run a simulation with 3DOF of 6DOF (current model). A similar approach is currently done with the equations_of_motion argument in the Flight class constructor.
• The 3DOF simulation should run faster than our current model!
• When using the 3DOF model, is is expected that the user may skip a few steps of the rocketpy workflow. For example, user do not needs to set moments of inertia since it will not be used for calculations.
• However, I personally believe it would be a good application to being able to run the same Rocket object with both 3DOF and 6DOF models so we can easily compare the models.

Optionally, one may create a new FlightClass, in case you find it easier. However, I don't really appreciate this approach. I think the "giant Flight class with different options" may be a better option.

Please read the thread below to achieve a better understanding!