Contents
What is the maximum height a plane can fly?
The highest certified altitude of an airliner was Concorde’s 60,000 feet. Today some of the corporate jets can fly at 51,000 feet.
At what height can you not breathe?
about 20,000 feet
It is the lack of oxygen rather than the reduced air pressure that actually limits the height at which we can breathe. An elevation of about 20,000 feet above sea level is the maximum height at which sufficient oxygen exists in the air to sustain us.
At what altitude does it get hard to breathe?
When you’re mountain climbing, hiking, driving, or doing any other activity at a high altitude, your body may not get enough oxygen. The lack of oxygen can cause altitude sickness. Altitude sickness generally occurs at altitudes of 8,000 feet and above. People who aren’t accustomed to these heights are most vulnerable.
Can a propeller drive work at supersonic speeds?
When this cone moves over the ear of an observer, he will hear the pressure changes across the boundary of this cone as a sonic boom. Theoretically, a properly designed propeller will still work at supersonic speeds, but the efficiency will be so horrible that nobody has tried that seriously.
Hypersonic flight within the atmosphere generates immense drag, and temperatures found on the aircraft and within the engine can be much greater than that of the surrounding air. Maintaining combustion in the supersonic flow presents additional challenges, as the fuel must be injected, mixed, ignited, and burned within milliseconds.
What’s the Max tip speed of a propeller?
In fact when designing the blades, a max tip Mach of ~.9 is a hard limit of design. The text continues to say that nevertheless some propeller aircrafts were able to approach speed of sound in a dive.
When did the Bell X-1 achieve supersonic flight?
The Bell X-1 attained supersonic flight in 1947 and, by the early 1960s, rapid progress towards faster aircraft suggested that operational aircraft would be flying at “hypersonic” speeds within a few years.