For the helicopter shown in Figure $4,$ with a constant $800$HP available:

$($a$)$ What is the minimum and maximum speeds possible OGE?

$($b$)$ At what speed would you expect maximum rate of climb to occur?

$($c$)$ As compared with the fixed wing aircraft, what is the different term for the helicopter power required in forward flight?

Figure $4$ Power required in forward flight. $W=10,00010$;$K=2011$;$e=0\mathrm{.}91$;$s=\frac{}{0},$ RPM $=320$;$M_{\text{e}\text{r}\text{i}\text{t}}=0\mathrm{.}75$;$f=15f{t}^2$; standard sea level, OGF.

Fig. $4$ Power required in forward flight. $W=10,000lb$;$R=20ft$;$e=0\mathrm{.}91$;$s=5\%$;$RPM=320,$ Merit $=0\mathrm{.}75$;$f=15f{t}^2$; standard sea level, OGE.