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“Military and acrobatic helicopter pilots often perform loops and barrel rolls in which their vehicle momentarily flies upside down,” he says. “During that time, the rotor still generates thrust toward the top of the helicopter, so the pilot must maintain sufficient momentum and altitude to remain airborne.”There’s a reason why you should never, ever fly upside down in a helicopter: The rotors will bend toward the skids and cut off the tail and you’ll plummet to your death. Helicopter rotors are designed to handle a lot of flexion, because each blade has to bend up and down as it moves into and against the slipstream.The AH-64 Apache can perform loops and sustain inverted flights for a few seconds. Like all other choppers, the AH-64 cannot sustain inverted flight.
Contents
What happens if a helicopter goes upside down?
There’s a reason why you should never, ever fly upside down in a helicopter: The rotors will bend toward the skids and cut off the tail and you’ll plummet to your death. Helicopter rotors are designed to handle a lot of flexion, because each blade has to bend up and down as it moves into and against the slipstream.
What helicopter can go upside down?
The AH-64 Apache can perform loops and sustain inverted flights for a few seconds. Like all other choppers, the AH-64 cannot sustain inverted flight.
Why does my RC helicopter fly backwards?
Forward/backward movement is controlled by the tail motor and you don’t have a lot of control over it. If changing weight distribution doesn’t help, it may a problem with the motor or the board. You may find someone in the coaxial forum who can help, as that’s where the 3 channel coax fans hang out.
Can helicopters fly to Everest?
If you’re wondering if a helicopter can fly to the top of Mount Everest, the answer is yes. It has been done before – but only once. In 2005, Didier DelSalle flew to the top of and even landed on the 8,848 m (29,030 ft) summit of Mount Everest.
Can helicopters fly in reverse?
Unlike an airplane, a helicopter can fly backwards or sideways. It also can hover in one spot in the air without moving. This makes helicopters ideal for things an airplane cannot do.
Can helicopters do loops?
Helicopters can do loops, rolls, and certain aerobatics providing they have a strong main rotorhead and fuselage. Not all helicopters can do aerobatics and trying it in the wrong helicopter will be fatal. The Westland Lynx, BO-105, Bell 407, and many others have all been shown to do aerobatics.
Why can the Red Bull helicopter fly upside down?
The rotor head, to which the blades are attached, is milled from a solid block of titanium rather than multiple components, skipping the hinges that typically allow the blades to bounce up and down to absorb aerodynamic forces.
Can a helicopter fly without a tail rotor?
Without the tail rotor or other anti-torque mechanisms (e.g. NOTAR), the helicopter would be constantly spinning in the opposite direction of the main rotor when flying.
Can RC helicopter fly upside down?
Go to your nearest RC airfield and you’ll likely encounter at least one enthusiast flying his model chopper upside down. Once the helicopter is upside down, then it is controlled in pretty much the same way as if it were right-side-up — except that the controls are inverted.
Can an Apache fly upside down?
Apache AH64D – the only helicopter that can fly upside down.
Can helicopters fly in the rain?
In principle, any helicopter can fly in clouds or rain. The complications would be: Icing: This is one of the big weather-related perils of flying. (The other is thunderstorms.)
How long can a helicopter fly upside down?
Even without these changes, many of today’s helicopters can fly upside down for seconds at a time, notes Frazzoli. “Military and acrobatic helicopter pilots often perform loops and barrel rolls in which their vehicle momentarily flies upside down,” he says.
Can planes fly upside down?
Depending on the aerofoil this could restore level flight and even allow the plane to climb. But wings on aerobatic planes are curved on both the upper and lower sides. With this symmetric design, the plane can fly either normally or inverted. The pilot can flip from one to the other by altering the angle of attack.
Why can the Red Bull helicopter fly upside down?
The rotor head, to which the blades are attached, is milled from a solid block of titanium rather than multiple components, skipping the hinges that typically allow the blades to bounce up and down to absorb aerodynamic forces.
Can Apache helicopter fly upside down?
Apache AH64D – the only helicopter that can fly upside down.
MIT School of Engineering | » Can helicopters fly upside down?
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How to Fly a Helicopter—Upside Down
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Learning 3D: how to flip your heli – YouTube
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heli keeps flying backwards and sideways – RC Groups
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Can An RC Helicopter Fly Upside Down? – Race N RCs
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- Summary of article content: Articles about Can An RC Helicopter Fly Upside Down? – Race N RCs A real helicopter’s engine is not designed to fly upse down. Once the chopper turned upse down, the fuel and other lubricants would not necessarily be … …
- Most searched keywords: Whether you are looking for Can An RC Helicopter Fly Upside Down? – Race N RCs A real helicopter’s engine is not designed to fly upse down. Once the chopper turned upse down, the fuel and other lubricants would not necessarily be … Flying an RC helicopter is a fun and exciting hobby to have and flying an RC helicopter upside down is even cooler. With this thought,…
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Can An RC Helicopter Fly Upside Down?The Answer will surprise you
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Can a helicopter fly upside-down? | Notes and Queries | guardian.co.uk
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- Summary of article content: Articles about Can a helicopter fly upside-down? | Notes and Queries | guardian.co.uk Model helicopters can certainly fly upse down, because their collective pitch control allows the rotors to be negatively pitched. That is, to direct air flow … …
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How to Fly a Helicopter—Upside Down
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How Can a RC Helicopter Fly Upside Down – The RC-Fever.com Blog
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» Can helicopters fly upside down?
Can helicopters fly upside down?
In theory (and in miniature), they can — but this isn’t something your average helicopter is built to do. Stunt shows are, of course, another story…
By Mark Dwortzan
To gain altitude and remain airborne, helicopters rely on rotor blades that generate vertical thrust. So what happens if a helicopter goes belly up? In theory, such a helicopter could stay aloft, maintains Emilio Frazzoli, associate professor of aeronautics and astronautics, whose research centers on improving the maneuverability of next-generation autonomous helicopters and other vehicles.
An acrobatic airplane can fly upside down by tilting its nose slightly upwards and using its wings to generate lift while it’s inverted — even though the wings are built to do it with the other face up. Theoretically, an inverted helicopter could use its rotors in a similar way: instead of positioning the rotor blades to generate thrust toward the top of the helicopter (as in normal operations), the pilot could orient them to produce thrust toward the bottom of the helicopter, thus keeping it aloft when inverted.
“Imagine you’re attached to a rotor blade,” Frazzoli suggests. “In order to generate lift upwards, you have to tilt the blade a little bit upwards. To generate lift toward the bottom of the helicopter, you have to tilt the blade a little bit downwards.”
Upside-down flight is actually quite common among model radio-controlled helicopters, Frazzoli observes. Go to your nearest RC airfield and you’ll likely encounter at least one enthusiast flying his model chopper upside down. Once the helicopter is upside down, then it is controlled in pretty much the same way as if it were right-side-up — except that the controls are inverted. For instance, the pilot would need to push the stick backward to make the helicopter move forward, and decrease the thrust to make it gain altitude.
However, there’s a world of difference between a commercial helicopter and these model versions. The higher mass and complex design of real helicopters make flying them upside down neither safe nor feasible.
To enable a commercial helicopter to fly upside down, manufacturers would need to make its rotor blades more rigid so as not to flex too close to the main body of the helicopter (otherwise they could rip off their own fuselage or other critical components). They would also need to redesign the joint that connects the rotor blades with the rest of the vehicle so it could bear the load of an upturned helicopter. Finally, they would need to develop new controls to allow the rotor blades to tilt downwards and reconfigure the engine so that fuel and lubricants could be distributed properly while the helicopter was inverted.
Even without these changes, many of today’s helicopters can fly upside down for seconds at a time, notes Frazzoli. “Military and acrobatic helicopter pilots often perform loops and barrel rolls in which their vehicle momentarily flies upside down,” he says. “During that time, the rotor still generates thrust toward the top of the helicopter, so the pilot must maintain sufficient momentum and altitude to remain airborne.”
Watch for that trick at your next local air show.
Thanks to Brian LeFloch of Hopewell Junction, NY, for his question.
How to Fly a Helicopter—Upside Down
Media Platforms Design Team
We’re in the front seat of a helicopter
, thumping along 1500 feet above the foam-flecked waves of the Gulf of Mexico, when pilot Chuck Aaron does something you’re never supposed to do. He pulls back on the controls and just keeps pulling. When the helo’s nose rears up, I feel my body sinking into the seat as my heart crawls up my esophagus. We keep going until all I see is blue sky, then the line that separates it from the greener blue of the gulf. A little voice in my head is saying huuuunh? and the weight of an implausible yet true realization sweeps over me: The rotors are now below us, the landing skids above. We are flying upside down.
There’s a reason why you should never, ever fly upside down in a helicopter: The rotors will bend toward the skids and cut off the tail and you’ll plummet to your death. Helicopter rotors are designed to handle a lot of flexion, because each blade has to bend up and down as it moves into and against the slipstream. In normal flight, the blades bend away from the cockpit. But if you fly upside down, they flex in the other direction, giving a whole new meaning to the word chopper.
Aaron, a 63-year-old with a mane of golden hair and a bushy mustache fit for a circus ringmaster, knows all about this. He was a helicopter pilot and mechanic living in Camarillo, Calif., when he got a call from Red Bull in 2004. They’d heard that he’d assembled a U.S. Army attack helicopter from parts scrounged on the open market. They asked him: Could he build a helicopter capable of looping the loop? “No,” he told them. It was impossible. End of story.
But Aaron kept mulling it over, and he thought that if you took the right kind of helicopter and modified it in just the right way, you might wind up with an aircraft that could fly upside down. Red Bull gave him the money, and he bought a pair of German BO-105 helicopters with rugged one-piece titanium rotor heads and four short, stiff composite blades. After a year of modifications—he refuses to reveal the engineering details—he took his helo up.
Success did not come easily. For three months Aaron got to know the machine, testing its capabilities. But fear held him back. “I’d get vertical and I’d chicken out,” he says. “But over time I kept going a little bit farther, and one day I pulled that sucker up and as I got to my chicken point, I did one of those instant things where I said, ‘I’m going for it.’ I pulled it straight back and I did the loop. As soon as I saw the ground I was like, ‘I can get this!’ So I pulled out of that and I did it again. I didn’t want to forget how I did it. So I did it again and again—10 times.” From that first loop he expanded his repertoire of maneuvers, and today he’s the only civilian pilot in the U.S. licensed to perform aerobatics in a helicopter.
It’s a cold morning in Pensacola, Fla., when I meet up with Aaron. A big air show starts tomorrow, and with the 20-mph winds, Aaron is debating whether to take part in the rehearsal. One time, he tells me, he almost killed himself trying to perform under similar conditions. This gives me pause, but Aaron assures me that we’ll be fine if we go out over the water and try a few maneuvers. So up we go.
We launch from the Naval Air Station’s ramp and pass over the beach. Aaron climbs until he’s above the barrier island that he’ll use as a reference line to orient himself. Then he pulls up into the loop. In a matter of seconds we’re over the top, then arcing downward. Aaron has discovered that this can be the most dangerous part. “If I keep it pointed down for too long, I’ll build up too much airspeed,” he says. “Then I’ll have too many g’s in the pullout and rip the transmission off.”
That doesn’t happen today, I’m pleased to report. Aaron once again pulls up into a climb, then startles me by rolling over to the left until our bodies are parallel to the horizon. He keeps rolling until we’re upside down, then brings us back up the other side. In a plane, the equivalent maneuver would be a mild trick called an aileron roll; in a helicopter, the procedure causes a disconcerting sensation, as if someone were holding you by your heels over the edge of a tall building.
Next, Aaron pulls back on the stick and waits for his airspeed to bleed off until we’re nearly dead in the air. Then he pushes the stick forward. We’re floating in our seats in a low-altitude approximation of NASA’s Vomit Comet. A second later we’re toppling forward. As we fall straight down Aaron rotates us 180 degrees on a vertical axis so our track is like the stripe on a barber pole, then pulls back so we level out.
Aaron keeps stringing together one maneuver after another: up, sideways, down—whoop! I’m starting to think about a barf bag as Aaron pulls out of a climb and turns us into the wind. He’s about to unleash the ultimate.
“Zero airspeed,” he says, gesturing at the instrument panel. “This is the back flip.”
He pulls back, and back, and back. I briefly have the sensation of climbing as the windshield fills with blue, and then the uncomfortable feeling of toppling backward, falling upside down, hanging in my straps, a blur of disorientation. The helicopter has pivoted, heels over head, from a standstill—like a swimmer doing a back flip off a diving board. Then we’re right side up again, barreling toward the shore below. My ears are filled with a piercing scream. It’s coming from my own throat. It’s a scream of pure, blind, mindless joy.
Jeff Wise Jeff Wise is a New York-based science journalist specializing in aviation and psychology.
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Can Helicopters Fly Upside Down?
Surprisingly, yes, helicopters can fly upside down. But, the catch is that they can only do it for a few seconds.
While some helicopters can perform inverted flight, especially if they’ve undergone modifications, the vast majority of helicopters are incapable of such a feat.
As inverted flight isn’t easy and has numerous safety risks attached, you’ll only ever see helicopters flying upside down as a stunt.
How Long is a Helicopter Able to Fly Upside Down For?
Being able to fly upside down requires helicopters to undergo certain modifications.
Even after these modifications are made, helicopters are only able to fly inverted for short time periods, like a few seconds.
Military and acrobatic pilots use inverted flight for performing loops and rolls. These maneuvers are not used in practical settings like in military combat or medevac.
3 Helicopters That Can Fly Upside Down
The following 3 helicopters are the most famous and capable models that are known for flying upside down.
Eurocopter AS350
The Eurocopter AS350, now updated to Airbus H125, is a light, single-engine utility helicopter that has three rotors.
This chopper is known for performing well at high altitudes, so its frame can withstand the high load of negative G force experienced during inverted flight.
This ability allows the AS350 to fly upside down and perform inverted loops, but only for short periods of time.
Westland Lynx
The Westland Lynx was developed in the UK as a multi-engine military helicopter, but it also has acrobatic abilities.
The Westland Lynx can perform loops and rolls in the air because it’s an agile chopper that flies at high speeds. Even the Blue Eagles and Black Cats helicopter teams use Westland Lynxes.
Its improved acrobatic abilities allow the Westland Lynx to manage sustained flight, but only for very short time periods.
The Westland Lynx can’t support sustained inverted flight longer than a few seconds.
Apache AH-64D
The Apache AH-64D is an American military helicopter that has a 4-bladed rotor system.
The AH-64 Apache can perform loops and sustain inverted flights for a few seconds.
Like all other choppers, the AH-64 cannot sustain inverted flight.
How is a Helicopter Able to Fly Upside Down?
Helicopters work by having their rotor blades generate vertical thrust.
Theoretically, if we change the angle on rotor blades, when a helicopter is inverted its rotor blades will continue to produce that thrust.
When inverted, the rotor blades would generate the thrust downwards, keeping the helicopter from falling.
Presently, helicopters are not designed to maintain inverted flight for longer than a few seconds due to the lack of benefit of inverted flight.
But, it is possible to design a ‘belly-up’ helicopter that flies with its rotors attached to the aircraft’s bottom.
Achieving this would require entirely redesigning the joint that connects the helicopter’s rotor blades to the fuselage.
Why Don’t Helicopters Fly Upside Down More Often?
Helicopters use their rotor blades for remaining airborne.
These rotor blades generate the lift needed to maintain the helicopter’s altitude.
Theoretically, if a helicopter were inverted, it should fly just as easily, only with inverted controls. Yet, in reality, inverted flights are often difficult and dangerous due to the difficult position it places the pilot in.
For that reason, inverted flight is mostly used on model radio-controlled helicopters instead of actual choppers.
There have not been widespread attempts to make inverted flight easier because of the lack of benefits.
Is the Helicopter Flying Upside Down in Spectre Real?
The Spectre trailer and movie features a helicopter, with James Bond in the cockpit, completing a 360° corkscrew stunt.
Specifically, the trailer shows a MBB Bo 105 helicopter completing this maneuver.
This stunt was real, and it was achieved by Chuck Aaron, who is one of only four pilots in the world that is licensed to perform aerobatics in a helicopter.
What Other Stunts Can a Helicopter Perform?
In addition to inverted flight, helicopters can perform the following stunts:
Funnels/Die Dashes
A helicopter flies into a circle, sideways, either nose-up or nose-down.
It’s a difficult maneuver because it requires positioning a chopper’s fuselage vertically.
Death Spiral
The helicopter’s fuselage is positioned parallel to the ground. The helicopter then spirals concentrically towards the ground.
It’s referred to as the ‘death spiral’ due to the difficulty of successfully completing it.
Tic-Toc
The helicopter completes a seesaw motion in a vertical position.
The helicopter achieves this by cycling between the 10 and 2 o’clock fuselage positions.
While the Tic-Toc is also regarded as a difficult and potentially dangerous stunt, it’s not as dangerous as the death spiral.
Pirouetting Flip
The helicopter does a flip while its tail spins in place.
There’s also a variant of the pirouetting flip called ‘chaos’ where the helicopter’s nose changes orientation while flipping.
Pirouetting Globe
The helicopter completes consecutive loops while pirouetting and changing its flight paths to appear like a globe.
Tail Slide
A helicopter flies at a higher altitude so that its fuselage is perpendicular to the ground.
The helicopter then falls down with its tail pointed downwards.
Sometimes pilots will also roll the helicopter sideways during this stunt.
Snake
The helicopter executes a set of left and right turns that keep it in the same direction.
In conclusion, yes, helicopters can technically fly upside down, but they can only do so for a few seconds due to the safety risks involved.
So while inverted flight is technically possible and has been achieved, it is neither beneficial nor desirable, so is something that is very, very rarely done.
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