REGULAR, INSTANTANEOUS TURNS RESULT IN SIGNIFICANT AIRSPEED LOSS
When performing a sustained turn, drag and gravity are balanced by engine thrust. The sustained
turn rate of turn is lower than the instantaneous turn rate, but is achieved without airspeed loss. In
theory, the aircraft can perform a steady turn until it runs out of fuel.
Energy Control
In air combat, the pilot must control the aircraft’s energy state. The total energy of an aircraft can be
represented as a sum of potential energy and kinetic energy. Potential energy is determined by the
aircraft’s altitude; kinetic energy is determined by airspeed. Because thrust developed by the engines
is limited, flying at a high AoA will cancel out the thrust. The aircraft will lose energy. To prevent this
during combat, the pilot should keep his flight envelope such that he is maneuvering at the aircraft’s
maximum sustained turn rate and minimizing turn radius simultaneously.
TOO MANY HARD TURNS WITH ALTITUDE LOSS LEAD TO AN AIRCRAFT WITH LITTLE ENERGY
Suppose that energy is equivalent to "money" used to "buy" maneuvers. Suppose there is a constant
replenishment (while the aircraft’s engines are running). Optimal control requires rational "money"
consumption for necessary maneuver purchases. Performing high-G turns causes the aircraft to lose
speed and consequently the energy supply (bank) lowers. In this case you can say that the price for
cheap turn rate was too high. You now have little money left in the bank and are an easy target for
an enemy with a fist full of cash.
Therefore, without a critical need, you should avoid high-G maneuvers that result in speed loss. You
should also try to maintain high altitude and not lose it without good reason (this is money in your
energy bank). In close combat, try to fly the aircraft at speeds that maximize your sustained turn rate
while minimizing your turn radius. If your airspeed reduces significantly, you have to reduce AoA by
pushing the stick forward and "unloading" the aircraft. This will allow you to gain speed quickly.
However, you need time this unloading carefully or you will give an enemy an easy kill.
IF YOU LOSE CONTROL OVER AIRCRAFT ENERGY MANAGEMENT, YOU WILL SOON FIND YOURSELF WITH LITTLE
AIRSPEED AND ALTITUDE
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