21XM Marine Propeller 42mm Replacement - O.S. Engine OS23870000  [OS23870000]

42mm Replacement Prop for 21XM Models

This 42mm marine propeller is supplied as an RC-scale spare intended for use with 21XM-designated models. The listing covers the prop as a direct replacement part, not a complete assembly, and it is intended for hobby-grade marine models only.

Compatibility is limited to the "for 21XM" designation shown in the product name; check that your hull uses a 42mm prop before fitting. Installation normally requires the correct prop adapter and securing hardware already fitted to the model's prop shaft; confirm shaft diameter and thread engagement before operation.

In practical tuning, switching prop diameters changes thrust versus RPM behavior. Use this prop when you need a like-for-like replacement or when testing small thrust changes on compact RC boats, and always perform static checks plus a brief low-throttle run after installation.