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Can a helicopter fly upside down, and if so, how, and if not, why?
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Can a helicopter fly upside down, and if so, how, and if not, why?
- Warren P Clark:
When I was in AF Squadron Officer’s school, they arranged for the Army to send over some Apache helicopters so that we could get a closer look. I asked one of the pilots if they could be flown upside down. He replied, “That would be against regulations, sir.” I asked if it would be possible. He repeated that it would be against regulations. I said OK and walked away. As I was leaving he said, “I do have a photo taken from inside the helicopter where the horizon is inverted. . .”
- Jack A Wayman:
Having minored in Philosophy and having flown the Osage, Irqouis, Kiowa, Blackhawk and Apache helicopters in the Army, I would say it depends on your definition of helicopter, fly, and upside down. Bricks can fly in one meaning of the word, but that is not the same as sustained or controlled flight, whether powered or non-powered. Also, to fly up-side down is not the same as merely to be upside down. Being up-side down during a controlled flight sequence is different than being up-side down in an un-controlled but recoverable, or uncontrolled and unrecoverable flight sequence. Many fixed-wing aircraft are designed to exert lift opposite gravity whether right-side up or up-side down. But helicopters are not designed or able to sustain inverted flight sequences, whether powered or non-powered. Helicopters are designed to fly suspended from a circular lifting area formed by lifting surfaces that rotates. In powered flight, the lifting surface is driven by the engine. In non-powered, auto-rotation glide the centrifugal force and momentum of the lifting surface is maintained by air moving up through the system as the aircraft descends. This preserved power can be used to maneuver the aircraft during descent and help control and cushion the landing. Being designed for suspended flight means survivable G-forces are designed to be positive, not negative. However, as one answer succinctly put it, some helicopter systems are able to withstand small amounts of negative G-forces. However, the load on the system must be carefully controlled throughout the flight sequence, from entry to exit to return to normal flight. Otherwise components not designed to endure those loads will fail and flight will no longer be able to be sustained or controlled. At which point the helicopter will assume the flight characteristics of a brick.
- Joe Song:
The helicopter can fly because the blades spin and create the air currents blowing down tho the ground and so the reaction force make it floating. “The legend of the Upside-down Helicopter still cannot be proved by science, but this is a photo for this mysterious thing.” If you want to do so you may need to make the blades spin at the different direction. You will lose altitude faster than free fall if you fly a normal helicopter upside down. Well, that’s weird. And also dangerous, the main concern is that you might get cerebral congestion coz’ you are upside-down. #let me know if you find one
- Mark Hrutkay:
Lots of answers from a lot of people who know little or nothing about helicopters. I’ve been flying all my life and owned a Eurocopter AS350 and a Bell 47. So the answer is YES and NO. No for helicopters with a “teetering rotor system”, which would be a Bell 47, Jet Ranger, and Huey as well as several others. These aircraft should never be subjected to negative G’s either. Why? The rotor blades (which are attached to the rotorhead) basically balance on the top of the rotor mast. If you hit a negative G load, the blades move based on the inertia of the blade and not control inputs (since they are weightless). There is a chance of “mast bumping” What Exactly Is Mast Bumping If you bump the mast, you may well damage it, resulting in an immediate failure and the rotor system departs the helicopter and you fall to your death. OR it damages the mast and at sometime in the future the mast fails, and you die. YES. You can do aerobatics and fly inverted in a helicopter with a RIGID or SEMI-RIGID Rotorhead. That would be the AS350 AStar, BO-105 (Red Bull), AH-64 Apache, CH-53, etc. I can say one day we had the AStar past 90 degrees in a SUPER steep turn and recovered. It's not something I really want to do again. But these helicopters can do loops and rolls, RC helicopters. A different thing. When they go upside down, their blades can pitch upwards unlike real helicopters and they can REALLY fly and maneuver upside down. BEAR in mind RC helicopters are dangerous, when you see someone flying one, stand 10′ away from them if they are upside down. Moving blades are dangerous and can kill; think about standing near someone swinging a chainsaw. Lastly, on helicopters, stay away from the tail. Tail rotor blades kill and can hit you enough that you are dead several times over before you can fall to the ground. A s
[...]
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Video edited automatically by QRBot.
- Warren P Clark:
When I was in AF Squadron Officer’s school, they arranged for the Army to send over some Apache helicopters so that we could get a closer look. I asked one of the pilots if they could be flown upside down. He replied, “That would be against regulations, sir.” I asked if it would be possible. He repeated that it would be against regulations. I said OK and walked away. As I was leaving he said, “I do have a photo taken from inside the helicopter where the horizon is inverted. . .”
- Jack A Wayman:
Having minored in Philosophy and having flown the Osage, Irqouis, Kiowa, Blackhawk and Apache helicopters in the Army, I would say it depends on your definition of helicopter, fly, and upside down. Bricks can fly in one meaning of the word, but that is not the same as sustained or controlled flight, whether powered or non-powered. Also, to fly up-side down is not the same as merely to be upside down. Being up-side down during a controlled flight sequence is different than being up-side down in an un-controlled but recoverable, or uncontrolled and unrecoverable flight sequence. Many fixed-wing aircraft are designed to exert lift opposite gravity whether right-side up or up-side down. But helicopters are not designed or able to sustain inverted flight sequences, whether powered or non-powered. Helicopters are designed to fly suspended from a circular lifting area formed by lifting surfaces that rotates. In powered flight, the lifting surface is driven by the engine. In non-powered, auto-rotation glide the centrifugal force and momentum of the lifting surface is maintained by air moving up through the system as the aircraft descends. This preserved power can be used to maneuver the aircraft during descent and help control and cushion the landing. Being designed for suspended flight means survivable G-forces are designed to be positive, not negative. However, as one answer succinctly put it, some helicopter systems are able to withstand small amounts of negative G-forces. However, the load on the system must be carefully controlled throughout the flight sequence, from entry to exit to return to normal flight. Otherwise components not designed to endure those loads will fail and flight will no longer be able to be sustained or controlled. At which point the helicopter will assume the flight characteristics of a brick.
- Joe Song:
The helicopter can fly because the blades spin and create the air currents blowing down tho the ground and so the reaction force make it floating. “The legend of the Upside-down Helicopter still cannot be proved by science, but this is a photo for this mysterious thing.” If you want to do so you may need to make the blades spin at the different direction. You will lose altitude faster than free fall if you fly a normal helicopter upside down. Well, that’s weird. And also dangerous, the main concern is that you might get cerebral congestion coz’ you are upside-down. #let me know if you find one
- Mark Hrutkay:
Lots of answers from a lot of people who know little or nothing about helicopters. I’ve been flying all my life and owned a Eurocopter AS350 and a Bell 47. So the answer is YES and NO. No for helicopters with a “teetering rotor system”, which would be a Bell 47, Jet Ranger, and Huey as well as several others. These aircraft should never be subjected to negative G’s either. Why? The rotor blades (which are attached to the rotorhead) basically balance on the top of the rotor mast. If you hit a negative G load, the blades move based on the inertia of the blade and not control inputs (since they are weightless). There is a chance of “mast bumping” What Exactly Is Mast Bumping If you bump the mast, you may well damage it, resulting in an immediate failure and the rotor system departs the helicopter and you fall to your death. OR it damages the mast and at sometime in the future the mast fails, and you die. YES. You can do aerobatics and fly inverted in a helicopter with a RIGID or SEMI-RIGID Rotorhead. That would be the AS350 AStar, BO-105 (Red Bull), AH-64 Apache, CH-53, etc. I can say one day we had the AStar past 90 degrees in a SUPER steep turn and recovered. It's not something I really want to do again. But these helicopters can do loops and rolls, RC helicopters. A different thing. When they go upside down, their blades can pitch upwards unlike real helicopters and they can REALLY fly and maneuver upside down. BEAR in mind RC helicopters are dangerous, when you see someone flying one, stand 10′ away from them if they are upside down. Moving blades are dangerous and can kill; think about standing near someone swinging a chainsaw. Lastly, on helicopters, stay away from the tail. Tail rotor blades kill and can hit you enough that you are dead several times over before you can fall to the ground. A s
[...]
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Video edited automatically by QRBot.
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