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Questions tagged [hover]

Sustained flight above ground level with no forward speed, best known for being done by helicopters (although some other types of aircraft are also capable of hovering).

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1 answer
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Is there any existing engine which can be converted to turbofan from turboshaft in mid flight?

I read about convertible engines. I want to know if there is any engine existing to meet up hover and cruise together.
Eaza's user avatar
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6 votes
3 answers
446 views

What size jet engines would it take to make a Cessna 140 hover?

I'm building a STOL bush plane using 4 jet engines located at 4 different points on the aircraft. I would like to know what size jet engines it would take to hover something like a Cessna 140.
bryan lawless's user avatar
9 votes
2 answers
1k views

Why do helicopter performance charts for hover out of ground effect (HOGE) have a "knee"?

Have a look at the following performance charts from Section 5 of Robinson R-22 Pilots Operating Handbook for hover out of ground effect (HOGE). If the temperature and gross weight are known, the ...
Igor's user avatar
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1 vote
1 answer
308 views

Did the Nazis ever have a pulse jet hovercraft?

I recently read an article about experimental aircraft Nazis had made during WW2. And one aircraft caught my attention.It was a experimental aircraft Named “Die Glocke” It was first described by a ...
Leo's user avatar
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1 vote
1 answer
429 views

Hover Performance in Helicopter dynamics

What do we mean by “good” hover performance in Rotor dynamics? If I want to analyse hover performance of a helicopter, then What parameters should I monitor?
Vikas Singh's user avatar
-4 votes
1 answer
7k views

What is the explanation for the appearance of airplanes hovering? [duplicate]

A few weeks ago, I saw a plane that appeared to be hovering in the air. It was a large commercial airliner. It was not a windy day, land speeds of 24km/h max that day, about 5km/h at the time I saw it ...
Amy's user avatar
  • 11
0 votes
1 answer
949 views

How does the Bell V-280 (a tiltrotor) rotate, bank, and fly sideways? [duplicate]

Here is a video of Bell V-280 Valor. Seems like the old definition of airplane's control is no longer hold for this kind of airplane. If you click the link, it will go directly to the part I want to ...
AirCraft Lover's user avatar
6 votes
2 answers
685 views

How come the hover efficiency for tiltrotors is better than tiltwings?

How do you compare the hover efficiency of tilt-rotor and tilt-wing aircraft? The Wikipedia page Tiltrotor mentions: Tiltrotors generally have better hover efficiency than tiltwings (...) But I was ...
red kit's user avatar
  • 61
0 votes
2 answers
258 views

Is it hard to hover a coaxial rotor helicopter?

Convetional rotorcrafts are hard to hover as when we increase collective, even tail rotor pitch needs to be compensated. But in coaxial design, will just increasing the collective do the job as torque ...
Goutham Manimaran's user avatar
0 votes
2 answers
281 views

Would this hovercraft be stable? [closed]

Would this two-rotor hovercraft design work? The bold black line is weighted metal on the lower to stable it. If it helps, this is a human sized hovercraft. Would it work if: prop1 lift > prop2 lift ...
Gabriel Kusiak's user avatar
41 votes
9 answers
16k views

Can all helicopters hover, and how long does it take to "stop"?

Following the accident of Kobe Bryant's helicopter N72EX, there are a few things that puzzle me: While waiting for clearance to fly close to Burbank airport, the helicopter didn't "stay in place", ...
jcaron's user avatar
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12 votes
3 answers
1k views

Why is ground effect greater over smooth hard surfaces?

Helicopter Flying Handbook: Ground effect is the increased efficiency of the rotor system caused by interference of the airflow when near the ground. The air pressure or density is increased, ...
Matt Goodrich's user avatar
33 votes
4 answers
10k views

What is it exactly about flying a Flyboard across the English channel that made Zapata's thighs burn?

CNN's French inventor makes 'beautiful' flight across Channel on hoverboard reports that: "French inventor Franky Zapata has successfully crossed the Channel on a jet-powered hoverboard for the ...
uhoh's user avatar
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1 vote
1 answer
183 views

About F-35 hover/ roll posts responsiveness [closed]

how responsive is the f35 in hover. especially in the roll axis. What do think of the roll posts? is it a good concept?
toshi ba's user avatar
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3 votes
2 answers
2k views

Why does a hovercraft lift blade look one way, but a propeller another?

The lift blade of a hovercraft looks like this: Note the ten rectangular blades. The blade of a propeller-craft looks this this: Note the three, traditional airfoil-shaped blades. Why are the two ...
Megalonychidae's user avatar
0 votes
1 answer
3k views

Can a F-35 shoot while hovering?

I know fictional aircraft are different than real ones but there is an F38 on Black Ops 2 (F35 based plane in 2025) http://callofduty.wikia.com/wiki/FA38 It appears in a mission like this ...
Delta Oscar Uniform's user avatar
4 votes
3 answers
3k views

Why does the Zapata Flyboard Air UL consume so much more fuel/hr than the Mosquito Air?

They are both ultralight and abide by FAA ultralight reg 14 CFR part 103. The Mosquito Air is an ultralight 1 person helicopter whereas the Zapata Air UL is a micro jet turbine powered 1 person ...
0tyranny0poverty's user avatar
2 votes
0 answers
1k views

How does the flyboard air get sufficient lift/thrust with such small form factor?

How does the flyboard air get so much thrust when it can't have more than an 6" disc area (if that) on each of its four lift engines? Isn't the thrust of a rotor = CT * p * Area * tipSpeed^2? (CT - ...
oeste's user avatar
  • 559
11 votes
1 answer
1k views

Why is tethered hover testing performed on helicopters?

The KGUC website notes that they have a tether for helicopter testing. From what I can tell this testing has something to do with hot and high conditions, but I don't know what the purpose is of ...
TomMcW's user avatar
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8 votes
4 answers
2k views

Why would a helicopter hold a 'nose-up' in hover?

(The Grand Tour; episode 2) SAS unit fast roping from a Blackhawk. Why is the helicopter pitched-up? Actual scene footage have it like that for a few seconds while holding steady over a building. How ...
user avatar
9 votes
2 answers
1k views

Does the ARCA hoverboard violate known limits on small-diameter electric fans?

The ARCA board is being hawked as achieving 430 pounds of lift from 36 electric fan motors for six minutes of 'flight.' c.f. : http://www.theverge.com/2015/12/24/...
RoboKaren's user avatar
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9 votes
3 answers
5k views

Is there a preferred wind direction for a helicopter in hover?

When hovering, how does a pilot deal with wind direction? As when landing is it preferable to point the nose into the wind? Is this a primary consideration for the pilot considering that he may need ...
TomMcW's user avatar
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10 votes
1 answer
2k views

Should helicopters fly when they the lack power for vertical climb out of ground effect?

Following up on this question: If a helicopter lacks power to climb vertically (i.e., with no translational movement) out of ground effect, is it ever considered safe to fly? If so, under what ...
feetwet's user avatar
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4 votes
1 answer
340 views

Can the V-22 carryout vertical takeoffs with shorter blades?

The V-22 has blades that are larger than blades on most helicopters. Could you make them smaller and still have the vertical takeoff effect? Bonus: Does the V-22 get some of its thrust from the ...
Ethan's user avatar
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