Slips Explained: Forward Slip vs. Side Slip
Day 2 of the 31-Day Safer Pilot Challenge focuses on a key maneuvering skill all pilots should master: the difference between a forward slip and side slip. While they may appear similar, each serves a very specific purpose in flight.
A forward slip is primarily used to lose altitude quickly without increasing airspeed – an essential technique when a pilot finds themselves too high on final approach. In some aircraft, it’s also used to reduce airspeed, though never simultaneously with altitude loss. Pilots must be aware of aircraft-specific limitations, particularly regarding slips with flaps extended.
In contrast, a side slip is a crosswind landing technique, commonly known as the “wing-low method.” This technique is used to align the aircraft with the runway during a crosswind approach and to maintain directional control during touchdown. Both maneuvers are essential but serve different phases of flight and objectives.
Executing a Forward Slip in a Real Approach
In the video, the pilot enters the pattern at Naples Airport already cleared for a touch-and-go behind King Air traffic. Upon turning final, it’s evident the aircraft is too high, with four white PAPI lights confirming a glide slope deviation. To lose altitude quickly, the pilot executes a forward slip by applying opposite aileron and rudder inputs – right pedal and left aileron – while keeping the nose aligned with the runway.
Aircraft-specific caution is advised: some models warn against slipping with flaps extended. In this demonstration, the aircraft (a Cessna 172 L model – 23 MZ specifically) permits slips with full or partial flaps. The result is a controlled descent, aligning the aircraft with the runway without overshooting the touchdown point.
This real-time example illustrates how powerful and precise the forward slip technique can be when used correctly and within manufacturer limitations.
Slipping for Airspeed vs. Altitude
The demonstration continues with an example of slipping for airspeed reduction. The pilot adds power and initiates a slip without altering altitude, showing how this maneuver can bleed off excess airspeed before landing. This highlights the versatility of the slip technique – when used intentionally and correctly, it can solve several approach and landing issues.
However, it’s important to note that slipping for both altitude and airspeed at the same time is generally discouraged, as it can lead to unstable or unsafe approaches. The lesson concludes with a smooth touch-and-go, reinforcing proper technique and encouraging pilots to become more proficient and confident in their slip.
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