Remove Hard coded radius value for lateral acceleration in descent under parachute

[RyanSamF]

Is your feature request related to a problem? Please describe.

Lateral acceleration for descent under parachute (in the function u_dot_parachute) depends on the air trapped beneath a parachute to determine the mass to divide drag force by. This added mass value depends on the radius R which is hard coded to 1.5
This causes issues with drift distance for smaller rockets and drogue parachutes leading to much higher drift distances than expected

Describe the solution you'd like

Either remove the hard coded value or determine radius based on a hard coded value for the coefficient of drag for a parachute, which is a much more reasonable thing to be hard coded.

Additional context

N/A

[Gui-FernandesBR]

Could you help us providing references?

[RyanSamF]

RocketPy/rocketpy/simulation/flight.py

Lines 1969 to 1995 in 2655a4f

	ka = 1 # Added mass coefficient (depends on parachute's porosity)
	R = 1.5 # Parachute radius
	# to = 1.2
	# eta = 1
	# Rdot = (6 * R * (1 - eta) / (1.2**6)) * (
	# (1 - eta) * t**5 + eta * (to**3) * (t**2)
	# )
	# Rdot = 0
	# Calculate added mass
	ma = ka * rho * (4 / 3) * np.pi * R**3
	# Calculate freestream speed
	freestream_x = vx - wind_velocity_x
	freestream_y = vy - wind_velocity_y
	freestream_z = vz
	free_stream_speed = (freestream_x**2 + freestream_y**2 + freestream_z**2) ** 0.5
	# Determine drag force
	pseudo_drag = -0.5 * rho * cd_s * free_stream_speed
	# pseudo_drag = pseudo_drag - ka * rho * 4 * np.pi * (R**2) * Rdot
	Dx = pseudo_drag * freestream_x
	Dy = pseudo_drag * freestream_y
	Dz = pseudo_drag * freestream_z
	ax = Dx / (mp + ma)
	ay = Dy / (mp + ma)
	az = (Dz - 9.8 * mp) / (mp + ma)

[Gui-FernandesBR]

@RyanSamF when I say "reference", I was actually meaning "bibliometric references". I'm going to search about it.

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I have to investigate it better, but I think @ArthurJWH has already solved this one with his recent modifications to the parachute class

[Gui-FernandesBR]

The main reference for parachute modeling is: https://apps.dtic.mil/sti/tr/pdf/ADA247666.pdf