Before revision: TO EXPLAIN TO A 5 YEAR OLD IS THAT THE PLANE IS COMMANDED FOR A CLIMB OR A SINK Speed and rate of climb There are a number of designated airspeeds relating to optimum rates of ascent, the two most important of these are VX and VY.
After revision: Speed and rate of climb There are a number of designated airspeeds relating to optimum rates of ascent, the two most important of these are VX and VY.