Power lost due to friction in a propeller

[Abigail1997]

1. Homework Statement
Calculate the power lost in friction in the system shown above, with d=0.36, rpm=200, u=0.72, prop=1m and oil=0.23m

Homework Equations

I know p=w/t comes into it in some form, either with other equations subbed in or a derivation somewhere, but not sure.

The Attempt at a Solution

 

[CWatters]

Power = torque * angular velocity

 

[rude man]

View attachment 104040

This is a kinematic viscosity problem. There is a simple formula for the force; see link below.

You will need to determine the area, velocity, and work done per second.

https://en.wikipedia.org/wiki/Viscosity