{
 "cells": [
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Utilities module usage"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from rocketpy.utilities import (\n",
    "    calculate_equilibrium_altitude,\n",
    "    compute_cd_s_from_drop_test,\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "%matplotlib widget"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 1. Estimations for your cd_s"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "compute_cd_s_from_drop_test(\n",
    "    terminal_velocity=10,  # The desired terminal velocity (m/s)\n",
    "    rocket_mass=20,  # kg\n",
    "    air_density=1.225,\n",
    "    g=9.80665,\n",
    ")"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 2. Altitude of Terminal Velocity being reached "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "a, b, c = calculate_equilibrium_altitude(\n",
    "    rocket_mass=20,\n",
    "    cd_s=5,\n",
    "    z0=1000,\n",
    "    v0=-20,\n",
    "    env=None,\n",
    "    eps=1e-3,\n",
    "    max_step=0.1,\n",
    "    see_graphs=True,\n",
    "    g=9.80665,\n",
    "    estimated_final_time=10,\n",
    ")\n",
    "\n",
    "altitude_function, velocity_function, final_sol = a, b, c"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "final_sol"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "print(\n",
    "    f\"The terminal velocity of {final_sol['velocity']:.3} m/s is reached after {final_sol['time']:.3} seconds at altitude of {final_sol['altitude']:.6} meters.\"\n",
    ")"
   ]
  }
 ],
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