Before taking the measurement, we have to remove the rope guard first.Also to make sure weather the vessel have the poker gauge or not.This poker gauge is use to measure the propeller shaft drop...
one prop per engine for most but there are a few planes with two counter rotating props per engine - the two props counter each others force (torque) to keep the props of powerful engines from...
well, if you want to measure the length, just stretch the tape and measure it. If you want to measure the diameter, measure the circumference of the screw, then divided by 3.1415, then you will get...