How to take propeller drop using a poker gauge

The poker gauge is inserted between the last two stern tube seals near the propeller to measure how far the shaft has dropped due to bearing

PROPELLER SHAFT · THRUST The difference between original and measured is called rudder drop or rudder wear down as shown in fig

tnt tumble dream drop Propeller drop: 1mm160mm diameter of the tail shaft and taper of 1:80 given since prop acts as cantilever beam n induces Bending

tnt tumble dream drop slot The propeller boss is measured and the stern tube is finished with sure drop of 20 mbar must be taken