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

Marine propeller 42mm for 21XM

This 42mm marine propeller is provided 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; confirm that your hull uses a prop matching 42mm diameter before fitting. Installation typically requires the correct prop adapter and securing hardware already fitted to the model's prop shaft; verify shaft fit and thread engagement before operation.

In practical tuning, swapping to a different diameter prop changes thrust versus RPM characteristics. Use this prop when you need a like-for-like replacement or when testing minor thrust changes on small-scale RC boats, and always perform static checks and a short low-throttle run after installation.