Lesson 6c - V-Speeds

Lesson Objective

The candidate will learn the differences between Maneuvering Speed (V_A), Normal Operating Speed (V_NO), and Never-Exceed Speed(V_NE). The candidate will identify what hazards are associated with each airspeed.  The instructor and student will fly together in dual practice, and accelerate to V_A, for at least a few moments, to get a feel for the stick sensitivity at this speed.  Flight to V_NE is NOT required. 

Regulatory Requirement

• Pre-Solo: §61.87(i)(8) "Flights at various airspeeds"
• Private Pilot: PTS - V 

Completion Standards

The student must be able to perform:

• successful demonstration of flight to the V_A and/or V_NO speeds, appropriate for the conditions and the glider

The student must be able to:

• recite the maneuvering speed for the club gliders
• explain the differences between Maximum Structural Crusing Speed and Maneuvering Speed
• explain the hazards with rapid, excessive control movement below V_A 
• explain the hazards associated with rapid control movement above V_A
• explain the relationship between V_NE and altitude. 

Prerequisite Study

• Schleicher ASK 21 manual Write down: V_NE & maximum control deflection, V_B, V_M, V_LE, V_S1, V_S0, V Lift Off,  V most favorable aero tow speed, V most favorable approach speed. 
• § 1.2  Abbreviations and symbols.
• Pilot Handbook of Aeronautical Knowledge Chapter 11 page 11-18 "Performance Speeds"
• V-Speeds -- Wikpedia article on V-Speeds
• FAA Special Airworthiness Bulletin  dated January 18, 2011 -- clarification on the meaning of V_A
• The Myth of Maneuvering Speed -- Flying Magazine

Further Study

• Wing Flutter Videos 
  
  • RC Sailplane with Flutter (YouTube )
  • Boeing 747 Wind Tunnel Flutter testing ( YouTube )
  • Fluttertest From the DG Website