The figure below illustrates the approximate efficiency of VTOL aircraft in hover.

Find, by curve fitting, the equation of $($MTOW$/$Installed HP$)=f($Disc$\_$Loading$)$ of the curve below and draw it

on the same axes. Show the equation.

Applying the momentum theory, estimate the efficiency for: $1)$ Agusta A$109,2)$ Black Hawk, $3)$ V $22,4)$ EH $101$

and $5)$ AV $8.$ Assume a diameter of $0\mathrm{.}8m$ for each of the four gimbaling jets in the AV $8$

Write a short comment about the above results in reference to the five aircraft

The solution should include a figure with: $1)$ The curve from equation $1$ and $2)$ The data found above for the five

aircraft showed by different markers on the same diagram