Air Combat Maneuvering
Figure 10: DISPLACEMENT ROLL
If you are rapidly closing on a bogey with lateral separation and low TCA, a displacement roll would be a
better maneuver to choose than a high yo-yo. A displacement roll reduces excessive closure by displacing
your aircraft relative to the bogeys flight path. Additionally, the maneuver can move your aircraft to a
different plane of maneuvering (lag pursuit) behind the bogey, while maintaining your energy package.
You will practice this maneuver as a follow-on to a low yo-yo. Initiate the displacement roll from anywhere
in the low yo-yo by attempting to align fuselages on the inside of the bogeys turn. Failing to align
fuselages will increase your TCA. Raise your nose above the bogey, and roll away from the inside of the
turn toward the bogeys six. If you do not raise the nose, you will execute a simple aileron roll which
neither displaces your aircraft nor controls your closure. Use rudder and back stick to keep your fuselage
aligned. Adjust your rate of roll to arrive in a firing envelope. If your intentions are to increase your nose-
to-tail while maintaining the preferred lead or pure pursuit, pull the nose higher in the vertical while
increasing your rate of roll, as in Figure 10.
T-45C Revision 1