diff --git a/lib/api.py b/lib/api.py
index c234267..6d735fe 100644
--- a/lib/api.py
+++ b/lib/api.py
@@ -1,12 +1,14 @@
 """
 This is the main API file for the RocketPy API.
 """
+import logging
 from typing import Any, Dict
 
-from fastapi import FastAPI, status
+from fastapi import FastAPI, Request, status
+from fastapi.exceptions import RequestValidationError
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.openapi.utils import get_openapi
-from fastapi.responses import RedirectResponse
+from fastapi.responses import RedirectResponse, JSONResponse
 
 from lib.views.flight import FlightSummary, FlightCreated, FlightUpdated, FlightDeleted, FlightPickle
 from lib.views.environment import EnvSummary, EnvCreated, EnvUpdated, EnvDeleted, EnvPickle
@@ -60,6 +62,14 @@ def custom_openapi():
     return app.openapi_schema
 app.openapi = custom_openapi
 
+# Logger
+@app.exception_handler(RequestValidationError)
+async def validation_exception_handler(request: Request, exc: RequestValidationError):
+	exc_str = f'{exc}'.replace('\n', ' ').replace('   ', ' ')
+	logging.error(f"{request}: {exc_str}")
+	content = {'status_code': 10422, 'message': exc_str, 'data': None}
+	return JSONResponse(content=content, status_code=status.HTTP_422_UNPROCESSABLE_ENTITY)
+
 # Main
 @app.get("/", include_in_schema=False)
 async def main_page():
diff --git a/lib/controllers/motor.py b/lib/controllers/motor.py
index e8001b4..fab9c3f 100644
--- a/lib/controllers/motor.py
+++ b/lib/controllers/motor.py
@@ -60,9 +60,6 @@ def __init__(self, motor: Motor, motor_kind, motor_engine):
 
         if motor_kind != MotorKind.solid:
             for tank in motor.tanks:
-                tank.geometry = TankGeometry(tank.geometry)
-                tank.gas = Fluid(tank.gas.name, tank.gas.density)
-                tank.liquid = Fluid(tank.liquid.name, tank.liquid.density)
                 rocketpy_motor.add_tank(tank.tank, tank.position)
         
         self.rocketpy_motor = rocketpy_motor
diff --git a/lib/models/motor.py b/lib/models/motor.py
index 4c35aec..df395c5 100644
--- a/lib/models/motor.py
+++ b/lib/models/motor.py
@@ -24,7 +24,7 @@ class TankFluids(BaseModel, frozen=True):
 
 class MotorTank(BaseModel, frozen=True):
     #Required parameters
-    geometry: "Dict[Tuple[int, int], float]" = {(0, 5): 1}
+    geometry: "List[Tuple[Tuple[float,float],float]]" = [((0, 5), 1), ((5, 10), 2)]
     tank_kind: TankKinds = TankKinds.mass_flow
     gas: TankFluids = TankFluids()
     liquid: TankFluids = TankFluids()
@@ -49,7 +49,7 @@ def __init__(self, **kwargs):
         super().__init__(**kwargs)
         tank_core = {
             "name": self.name,
-            "geometry": self.geometry,
+            "geometry": { t:f for t,f in self.geometry },
             "flux_time": self.flux_time,
             "gas": self.gas,
             "liquid": self.liquid,