quires a higher power. The increase in ve- 
locity to 227 knots accounts for the increase 
in power required to 872 hp. Actually, the 
various points on the curve of power required 
can be considered affected in this same fashion. 
At specific lift coefficients and angles of attack, 
a change in altitude will alter the true airspeed 
particular to these points and cause a change 
in power required because of the change in 
true airspeed. An increase in altitude will 
101 
Revised Januaty 1965