Added cache for Thrustcurve API

Author: Monta120

rocketpy/motors/motor.py

@@ -15,8 +15,11 @@
 from ..prints.motor_prints import _MotorPrints
 from ..tools import parallel_axis_theorem_from_com, tuple_handler
 
-
 # pylint: disable=too-many-public-methods
+# ThrustCurve API cache
+_thrustcurve_cache = {}
+
+
 class Motor(ABC):
     """Abstract class to specify characteristics and useful operations for
     motors. Cannot be instantiated.
@@ -1941,8 +1944,15 @@ def _call_thrustcurve_api(name: str):
             If no motor is found or if the downloaded .eng data is missing.
         requests.exceptions.RequestException
             If a network or HTTP error occurs during the API call.
+        Notes
+        -----
+            - The cache prevents multiple network requests for the same motor name.
+            - The returned data is ready to be decoded and loaded via `GenericMotor.load_from_eng_file`.
         """
+
         base_url = "https://www.thrustcurve.org/api/v1"
+        if name in _thrustcurve_cache:
+            return _thrustcurve_cache[name]
 
         # Step 1. Search motor
         response = requests.get(f"{base_url}/search.json", params={"commonName": name})
@@ -1979,6 +1989,7 @@ def _call_thrustcurve_api(name: str):
             raise ValueError(
                 f"Downloaded .eng data for motor '{name}' is empty or invalid."
             )
+        _thrustcurve_cache[name] = data_base64
         return data_base64
 
     @staticmethod