Normal
All propeller driven watercraft experience a condition called Prop Cavitation. Doesn't matter if its a runabout with an outboard or an oil super tanker. In certain conditions a vacuum forms on the back of the prop. Water rushes in to fill this vacuum and causes a vibration. The conditions, speed and design of the prop can increase or decrease the amount of cavitation.It is a normal thing and NOTHING to worry about. I have had people mention the vibration in shaky voices while I hadn't even noticed it happening. The difference between knowing and unknowing.Cruise ships weigh millions of pounds [GRT is a measure of space, not weight] Water is incompressible, moving millions of pounds using props that attempt to compress the incompressible is not done without some normal reaction.
All propeller driven watercraft experience a condition called Prop Cavitation. Doesn't matter if its a runabout with an outboard or an oil super tanker. In certain conditions a vacuum forms on the back of the prop. Water rushes in to fill this vacuum and causes a vibration. The conditions, speed and design of the prop can increase or decrease the amount of cavitation.
It is a normal thing and NOTHING to worry about. I have had people mention the vibration in shaky voices while I hadn't even noticed it happening. The difference between knowing and unknowing.
Cruise ships weigh millions of pounds [GRT is a measure of space, not weight] Water is incompressible, moving millions of pounds using props that attempt to compress the incompressible is not done without some normal reaction.
