How are forward slips normally performed in a sailplane?

• A. With dive brakes or spoilers fully open
• B. With full rudder and aileron opposite
• C. With only elevator input
• D. With the flaps extended

Answer: (A)

Forward slips rely on creating a side-slip to dramatically increase drag and allow a steeper descent without gaining airspeed. In a sailplane, you achieve this by applying opposite rudder and bank with the ailerons, while fully opening the dive brakes or spoilers to maximize drag. That combination makes the airplane slide through the relative wind, losing altitude efficiently while keeping the speed in check. Elevator input alone doesn’t produce the necessary sideways wind component, and flaps aren’t used on typical sailplanes to accomplish a slip. The dive brakes/spoilers are the key element that makes the forward slip effective and safe for energy management.