diff --git a/src/calculation_time_constrains/service.py b/src/calculation_time_constrains/service.py
index 04985ec..10998ec 100644
--- a/src/calculation_time_constrains/service.py
+++ b/src/calculation_time_constrains/service.py
@@ -17,7 +17,7 @@ from src.overhaul_scope.service import get as get_scope
 from .schema import CalculationResultsRead
 
 
-def get_overhaul_cost_by_time_chart(overhaul_cost: float, days: int,numEquipments:int ,decay_base: float = 1.1) -> np.ndarray:
+def get_overhaul_cost_by_time_chart(overhaul_cost: float, days: int,numEquipments:int ,decay_base: float = 0.3) -> np.ndarray:
     if overhaul_cost < 0:
         raise ValueError("Overhaul cost cannot be negative")
     if days <= 0: