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Questions tagged [hover]

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3
votes
2answers
317 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 ...
-1
votes
1answer
698 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 ...
1
vote
2answers
1k 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 ...
1
vote
0answers
604 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 - ...
10
votes
1answer
605 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 ...
5
votes
4answers
907 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 ...
9
votes
2answers
942 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/...
8
votes
1answer
1k 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 ...
3
votes
1answer
229 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 ...