VNE Revisited

In our January issue, we ran an article, "Slow Down, You Move Too Fast," which focused on aerodynamic flutter, how high speeds can cause it and what can be done to minimize it. One aspect of the article drew comments and criticism from readers, some of which were published in the Unicom section in our March issue, involved that articles statements referencing a fixed-wing aircrafts never-exceed speed (VNE) as a true airspeed. Many readers rightly took us to task for those statements, pointing out VNE is an indicated airspeed-at least when published for the airplanes they fly-expressing skepticism and questioning our veracity. This article is an attempt to both respond to those valid criticisms and set straight the record associated with never-exceed speeds and our original statements.

Key Takeaways:

• The article corrects a previous error, clarifying that V_NE (never-exceed speed) is typically an indicated airspeed for most personal aircraft, not a true airspeed, although exceptions exist for specialized aircraft.
• V_NE is the speed beyond which structural damage, including flutter, may occur, and is established at 90% of an aircraft's design dive speed (V_D) during certification.
• Despite V_NE often being an indicated airspeed, aerodynamic flutter is primarily a function of true airspeed, which means the safety margin above V_NE can decrease significantly at higher altitudes.
• Pilots should be cautious when flying at high altitudes and speeds near V_NE, especially in older aircraft, as the true airspeed dependency of flutter can erode the actual safety margin.

Key takeaways sponsored by Aviator Pro | Start Your Training ->

See a mistake? Contact us.