Horizontal Stabilizer Knot True Airspeed 
Pilot Institute
JULY 11, 2025
Key Takeaways Mach number is a dimensionless ratio of true airspeed to local speed of sound. Mach number is simply a ratio of your true airspeed to the local speed of sound. Since it’s a ratio, it doesn’t matter if you measure speed in knots, miles per hour, or meters per second. Here’s why. What Is Mach Number?
Plane and Pilot
SEPTEMBER 20, 2024
Alongside a nearby highway, some recognizable bits of airplane, the vertical stabilizer and rudder, a horizontal stabilizer and elevator, fell separately to Earth. But a review of the avionics data shows it was entered at the correct airspeed (placarded as between 104 and 165 knots), and the roll rate was constant.
Plane and Pilot
SEPTEMBER 20, 2024
Alongside a nearby highway, some recognizable bits of airplane, the vertical stabilizer and rudder, a horizontal stabilizer and elevator, fell separately to Earth. But a review of the avionics data shows it was entered at the correct airspeed (placarded as between 104 and 165 knots), and the roll rate was constant.
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