The other efficiency between P D to P E if I define the efficiency, I call that as Q P C or Quasi Propulsive Efficiency which is equal to P E by, sorry, p d, that is, if this is my output required, this is my input to the propeller. Then the efficiency is the ratio between output by input P E by P D.
We will see in the next hour how this can be broken up into components and how we can utilize it. We will stop here. Thank you, but I can finish it now. I could not finish it, sorry, sorry about that.