Propeller Shaft Bearing Spacing Calculator
This tool calculates a preliminary maximum unsupported distance between adjacent propeller-shaft bearings. It can also estimate whether one or more intermediate bearings may be required over a longer shaft installation.
Important: This is a preliminary critical-speed calculation, not approval of a complete shaft installation.
The result does not verify shaft diameter, propeller overhang, bearing load, bearing length, bearing clearance, water supply,
alignment, thrust, coupling selection or hull structure. A self-aligning shaft seal or inner bearing should only be counted as
a supporting bearing when its manufacturer confirms that it is suitable for this purpose in the specific installation.
Calculation source: ABYC P-6.