Tactics :There are five main things which a pilot must remain conscious of when contemplating an
aerial engagement, of which, getting and keeping sight is the most important. In Southeast
Asia, over 85% of all kills are attributed to the attacker spotting and shooting the defender without ever being seen.Structural limitations of both the attacking and defending fighters must be taken into account, such as thrust-to-weight ratio , wing loading, and the "corner speed" (the maximum/minimum speed at which the aircraft can attain the best
turning performance). Variable limitations must also be considered, such as turn radius, turn rate, and the specific energy of the aircraft. Position of aircraft must quickly be assessed, including direction, angle off tail (the angle between flight paths)and closing speed. Also, the pilot must be aware of his wingman’s position, and maintain good communication.A pilot in combat attempts to conserve his aircraft’s energy through carefully timed and executed manoeuvres. By using such manoeuvres, a pilot will often make trade offs
between the fighter’s potential energy (altitude), and kinetic energy (airspeed), to maintain the energy-to-weight ratio of the aircraft, or the "specific energy". A manoeuvre such as the "low yo-yo" trades altitude for airspeed to gain closure on an enemy, and to decrease turn radius. The opposite manoeuvre, a " high yo-yo", trades speed for height, literally storing energy in "the altitude bank", which allows a fast moving attacker to slow his closing speed.
en.m.wikipedia.org/wiki/Basic_fighter_maneuvers#Low_Yo-Yo
en.m.wikipedia.org/wiki/Basic_fighter_maneuvers#High_Yo-Yo