Acceleration
of a stream of air through a Propeller
Engine
u
ue
Thrust per
Unit Energy Consumption (Rocket vs. Propeller)
Propeller
Thrust Ratio
.
T=ma(ue-u)
.
.
.
T
E
@
Assume
a best thermal efficiency of 40%, the maximum
possible value of propeller thrust ratio becomes.
.
T
E
@