Hull and surface roughness

Hull roughness

The instrument to measuring hull roughness is the BSRA Roughness Gauge. The instrument measures the Average Hull Roughness (AHR), which is defined as the average of minimum 100 measurements of Mean Hull Roughness (MHR). MHR is the average …

Underwater propeller polishing

Propeller surface roughness

Introduction

The importance of fuel economy in present day ship operation has been demonstrated many times in recent years. Oil costs have fluctuated for years. The requirement to maintain economical operation is therefore vital.

Notable advances have been made in …