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Coffin corner (also known as the aerodynamic ceiling [1] or Q corner) is the region of flight where a fast but subsonic fixed-wing aircraft 's stall speed is near the critical Mach number, at a given gross weight and G-force loading. In this region of flight, it is very difficult to keep an airplane in stable flight.
- True Stall Speed: Increasing with Altitude
- Maximum Mach Number (MMO): Preventing Your Wing from Going Supersonic
- The Speed of Sound Decreases as It Gets Colder
- Coffin Corner: Where They Meet
- GeneratedCaptionsTabForHeroSec
As you climb, the air becomes less dense, and your wings need more airflow to generate the same amount of lift. So, as you climb, your true stall speedincreases. This is true in a prop, turboprop, or jet.
As you climb, the true airspeed to reach MMO decreases. In sub-sonic jets, MMO prevents you from reaching your critical mach number.That's the speed where some air flowing over your wings begins traveling at the speed of sound. As the air flows over your wing, it accelerates. At some point, the air in front of your wing may be subsonic, but it will...
Supersonic flow is the main limitation of a sub-sonic jet's MMO. And while MMO is a fixed number (e.g. 0.85 Mach), the true airspeed where you reach MMO decreases as the air gets colder. As you climb in altitude, air temperature decreases. That's why jet aircraft have a moveable "barber pole"needle to show MMO, that automatically decreases with tem...
As you approach the aircraft's maximum ceiling, you'll find that MMO and stall speed meet, or at least get close. Most of today's jets have a fairly wide margin between stall and MMO, but a great example of a coffin corner aircraft is the U-2. At high altitudes, the U-2 can have as little as a 5 knotsbetween stall and mach buffet. That leaves no ro...
Learn what coffin corner is and why it's dangerous for jets. Find out how stall speed, critical mach number, and dynamic pressure affect your aircraft performance and control.
Oct 30, 2023 · The coffin corner is the region of a flight envelope where the aircraft's stall speed and critical Mach number are close. Learn what happens when an aircraft enters this dangerous zone and how to avoid it, with reference to a case study and illustrations.
Sep 30, 2020 · The coffin corner is the Q Corner, where an aircraft can stall due to flying too fast and slow at high altitude. Learn how pilots avoid and escape this dangerous situation and why it is not a concern for commercial flights.
- Nicholas Cummins
Jan 1, 2024 · Coffin Corner is the flight region where stall speed is close to the aircraft's critical Mach number, leading to loss of lift and potential catastrophe. Learn how high-speed and low-speed stalls occur, how they affect aircraft performance, and how pilots avoid them.
Coffin corner is the point where the aircraft's speed differential between stall and Mach buffet is minimal. Learn how to avoid flying at this altitude and the consequences of exceeding the limits.
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Most of us have never had to worry about exceeding VNE - especially in level flight. And in a piston airplane, VNE is about as far away from stall speed as you can get.
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