I’m trying to use the RocketPy package. There is a useful page for using RocketPy for simulating rocket flight, and it has the following definition for the motor:

Pro75M1670 = SolidMotor(
    thrust_source="../../data/motors/cesaroni/Cesaroni_M1670.eng",
    dry_mass=1.815,
    dry_inertia=(0.125, 0.125, 0.002),
    nozzle_radius=33 / 1000,
    grain_number=5,
    grain_density=1815,
    grain_outer_radius=33 / 1000,
    grain_initial_inner_radius=15 / 1000,
    grain_initial_height=120 / 1000,
    grain_separation=5 / 1000,
    grains_center_of_mass_position=0.397,
    center_of_dry_mass_position=0.317,
    nozzle_position=0,
    burn_time=3.9,
    throat_radius=11 / 1000,
    coordinate_system_orientation="nozzle_to_combustion_chamber",
)

For this example, all the values are chosen, but I want to use a different motor and cannot find the data for all these parameters? (nozzle radius, grain number, grain density, etc.?)

Where could I find this information for different rocket motors?

I believe it used to be on the N.A.R. (National Association of Rocketry) website which seems to no longer have it?

Thanks for any help.