Questions tagged [vtol]

For questions about vehicles capable of vertical take-off and landing.

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VTOL Propeller Sizing and Executing a transition from VTOL to Forward Flight mission profile

Hi I am an engineering student, currently in the process of designing a compound UAV drone capable of both vertical and forward flight. I've made significant progress, having completed initial gross ...
AeroBoi's user avatar
0 votes
1 answer
76 views

Portable VTOL Startup [closed]

I am Alessandro and I am currently developing a new portable electric VTOL that can be carried by car without a trailer and allows a flight time of around 15 min carrying one person. The expected ...
Alessandro Pippa's user avatar
1 vote
1 answer
113 views

Can a tail-sitter drone like the XFY-1 Pogo aircraft have any advantage over a classic quadrocopter

I looked at a few rc models of the xfy-1 pogo plane and wondered why there weren't more drones in this setup, some seemed very agile. I think this concept can be refined. of course, the contra-...
San's user avatar
  • 13
2 votes
2 answers
477 views

Different Engine/Prop Sizes on Same Wing/Single Craft?

On a four propeller/engine wing, I’m wondering if theoretically at least, you could have a larger engine near the root of the wing with smaller engine(s) further out on the span..?.. If you could have ...
Greg Dean's user avatar
2 votes
2 answers
435 views

How free are VTOL pilots to hover?

When piloting a Harrier or F35 can the pilot just hover at will? Or is this possibly something that will eat up lots of fuel, and should only be done when planned? (like for landing) Is spontaneously ...
matthias_code's user avatar
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0 answers
72 views

what is Limit load factor structural and aerodynamic envelope at structural design gross weight and maximum gross weight?

As an aerospace engineer, as soon as I saw the words "structural and aerodynamic envelope" the first thing that popped into my mind that is it V-n diagram? But when I searched about it in ...
Sudipto Tushar's user avatar
3 votes
2 answers
246 views

How is the power gained from exhaust of an engine calculated?

Ryan XV-5 Vertifan used exhaust gas from engine to rotate the fan inside the wing. If I want to design an aircraft using this propulsion system how can I calculate how much power I can get from a ...
Eaza's user avatar
  • 121
3 votes
2 answers
212 views

Why does the V-Bat not counter-rotate?

V-Bat is a VTOL aircraft built by a company called Martin UAV. It seems to have a single pusher propeller. But then why does it not counter-rotate to balance the rotation of the propeller? Any clear ...
Atharva's user avatar
  • 33
1 vote
2 answers
421 views

What is the major difference between this VTOL setup and an actual helicopter, in terms of degree of freedom?

I am studying QNET VTOL(Vertical Take off & Landing) system. I want to know how it is different from an actual helicopter . According to my understanding, an actual helicopter has 6 degrees of ...
DSP_CS's user avatar
  • 163
3 votes
1 answer
1k views

Why do F-35B jets hover with their weapons bay doors partially open?

This is an interesting phenomenon noted for F-35B aircraft during vertical flight and vertical landing. They will do so with their weapons bay doors partially opened. ...
Romeo_4808N's user avatar
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2 votes
4 answers
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What is the decrease in power when a drone is in descent?

For a quad-copter, or a fixed-wing drone with quad-rotor formation, how much would the power of the motor decrease when a constant speed descent is needed to bring the drone back to the ground? Does ...
Faito Dayo's user avatar
0 votes
1 answer
317 views

If I put two ductfans behind one another, would I got the sum of the rated thrust or other thrust values?

I am trying to design a VTOL system for a drone and I don't want to have extending motor arms that make it look like a quadcopter. I want to use duct fans and thrust vectoring nozzles. However, the ...
Faito Dayo's user avatar
3 votes
3 answers
294 views

How does the Urbanaero flying car move forward?

From the pictures of UrbanAero flying car: https://www.urbanaero.com/cityhawk, I can see that can achieve VTOL using the two propeller in front of and in the back of the passenger compartments. ...
Faito Dayo's user avatar
5 votes
1 answer
1k views

How a takeoff decision point(TDP) for vertical takeoff vehicle is defined?

For a vertical takeoff vehicle like a helicopter, how the takeoff decision point is defined or computed? Look at the snapshot below, seems the height of TDP is related to the rejected takeoff distance?...
VvV's user avatar
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3 votes
3 answers
533 views

Can you have a Hybrid Turboprop-Jet engine?

To start things off I am writing this to gain information for vehicles in a story, so I am more so looking for theoretical possibilities, unless there are real world examples. The background and my ...
Markitect's user avatar
  • 133
3 votes
2 answers
978 views

Why does Harrier have split hot exhaust nozzles?

This is a repost after the original questions were deemed too complicated. Hawker Sea Hawk shot by Smudge 9000 under CC-SA 2.0 licence. Harriers seem to inherit elements from Sea Hawk, that the ...
CrystallizedRefresher's user avatar
1 vote
1 answer
234 views

I need some help to understand the rationales behind some STOVL jet designs, especially the Pegasus-Harrier configuration [closed]

In the question:Why do VTOL aircraft (F-35 or Harrier) have only one engine? Aeroailas answered why mature STOVL fighter designs only use one main engine, but did not answer why there are no mature ...
CrystallizedRefresher's user avatar
1 vote
1 answer
90 views

Can a normally poorly handling airframe with high moments of inertia actually have superior flight dynamics under autonomous control? [closed]

I’m not a pilot but know a thing or two about flight dynamics. As you know there are currently quite a few aircraft under development designed for low-and-slow and (eventually) autonomous flight. ...
Peterr de Vries's user avatar
1 vote
1 answer
3k views

What would be the Sref i.e. Reference Wing Area for Drag Build Up Calculation in case of a box wing design?

Would Sref be sum of areas of both, the front and the back wing? or just one wing? Assuming both the wings have equal areas (image below) Details - So, I am calculating drag using the component drag ...
Leo's user avatar
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2 votes
0 answers
95 views

The cost of maintaining VTOL devices

Which device for VTOL flight costs the most to maintain for a given number of flight hours? A tiltwing mechanism? A 2D thrust-vectoring nozzle (vectoring only between VTOL position and cruise ...
user39178's user avatar
  • 313
-4 votes
3 answers
251 views

Would this quadrilateral-shaped airfoil produce lift with a zero angle of attack?

I have been recently studying the shapes and characteristics of different high-lift airfoils that have been used for VTOL aircrafts. While studying these different designs today, a particular ...
user avatar
15 votes
3 answers
2k views

How much thrust is lost through a curved exhaust nozzle?

In modern VTOL aircraft energy is usually directed through nozzles to achieve vertical lift. How much energy is lost when changing the direction of flow in static thrust conditions?
usernamechecksout's user avatar
0 votes
1 answer
115 views

How to use a set of Pressure Transducer to mimic pitot static tube for VTOL vertical airspeed indicator?

May i know if i have 3 pressure transducer, 1 facing upwards and the other downwards to measure the vertical velocity of a VTOL (Vertical Takeoff and Landing aircraft) and another 1 on the nose of the ...
Terence Nacho's user avatar
12 votes
1 answer
896 views

Why is the F-35B's elevator not in neutral position when in vertical flight mode?

I was watching videos of F-35B taking off and landing vertically on ships when I realized that when transitioning from horizontal to vertical flight mode (I don't know the exact vocabulary to describe ...
Manu H's user avatar
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4 votes
3 answers
3k views

What are the disadvantages of a Tail providing lift? (tandem-wings included)

Most aircraft feature the tailplane configuration, which requires the main wing to provide higher lift than the weight of the plane itself, what seems counterproductive. Few aircraft have featured ...
zaumo's user avatar
  • 55
2 votes
4 answers
2k views

How do STOVL and V/STOL aircraft differ?

Wikipedia's page for STOVL begins with A short take-off and vertical landing aircraft (STOVL aircraft) is a fixed-wing aircraft that is able to take off from a short runway (or take off vertically ...
cyberservant's user avatar
3 votes
1 answer
911 views

Which prop location creates more lift? Leading edge or blown flap?

Which prop creates more lift? Leading edge or blown flap? In distributed propulsion there seem to be 3 prop locations: leading edge (NASA X57, blackfly), blown flap (Lillium), and pusher prop (...
Fred's user avatar
  • 1,243
2 votes
2 answers
217 views

XFY-1 Vertical take-off mechanics

Hi I saw this video the other day of an XFY-1 doing a vertical take-off and landing and moving left to right while hovering. See the video Here. After watching this I had a few questions on how ...
FutureCake's user avatar
-1 votes
1 answer
103 views

Questions regarding VTOL and VMU inhibits [closed]

I have been working on a game which has futuristic VTOL-capable air and aerospace crafts. A player recently wrote that the stall warning (tone and aural) and AoA (tone and visual) were distracting/...
Jason Reskin's user avatar
2 votes
2 answers
315 views

Is a chambered fan more efficient than a ducted fan?

A chambered fan is not exposed to the oncoming airflow in forward flight. I am working on a VTOL design that uses a chambered fan. There will be a wing attached to top of the thrust arms. Could it ...
Tom Daily's user avatar
20 votes
2 answers
21k views

Can you identify this fighter aircraft?

If someone can identify this aircraft, please tell me which aircraft this is?
KARTIK GURNANI's user avatar
3 votes
1 answer
648 views

Why does the US Marine Corps fly the Harrier, a VTOL or operationally STOVL aircraft?

The UK flies the Harrier because they have STOBAR carriers, but why does the United States Marine Corps fly the Harrier?
baba yaga's user avatar
  • 141
-2 votes
1 answer
457 views

What are the commercial benefits of VTOL? [closed]

there are a lot of companies doing R&D on VTOL aircraft. I understand their necessity for the military, but for civilian aviation, there are a very few application that requires it( medevac, ...
toshi ba's user avatar
  • 411
1 vote
1 answer
180 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
  • 411
2 votes
3 answers
319 views

Could wing tilting be a mechanism for VTOL and high angle of attack for jetliners? [closed]

My question is about turbofan airliners, could an airplane tilt its wings 90 degrees so that the fuselage horizontal axis is perpendicular to the longitudinal axis of the turbo fan. This way an ...
roma salah's user avatar
3 votes
2 answers
513 views

Are there planes that can fly without wings? How would a plane be able to fly without wings? [duplicate]

Are there any planes that can fly without wings? How do they produce lift? How do they control the attitude?
Mitchell Thomas White's user avatar
7 votes
4 answers
903 views

During VTOL landings, do Harrier pilots cut power before touching the ground?

When vertically landing, do Harrier pilots cut power before they touch the ground?
jwzumwalt's user avatar
  • 11.5k
2 votes
1 answer
232 views

How do I calculate the total cruise power from the propellers accounting for the losses?

Let's say I have an aircraft with four propellers (see diagram below) and I am supposed to calculate the cruise power required to drive the aircraft forward. The wing creates the lift and propellers ...
sai teja's user avatar
  • 437
1 vote
1 answer
129 views

What's the smallest 3-blade propeller for this motor? [closed]

I've got a 15470 brushless 35kw motor from China How do I find the smallest 3-blade propeller I can use for this motor? Here are it's specs, Max Power: 35KW Max Amp: 400A Max RPM: 8500 Max Volt: 120v ...
jscomino's user avatar
2 votes
0 answers
85 views

How are rotorcraft and/or VTOL aircraft handled once they get to an airport? [duplicate]

I am asking this from an ATC perspective ... my experience as a pilot is that they would make helicopters fly the same approach but once they got the airport environment in site where do they go? Taxi ...
Jason Reskin's user avatar
2 votes
1 answer
1k views

How fast do four Tire-Propellers have to rotate to lift 2000 lbs? [closed]

I just saw this come out, Goodyear's Tire-Propeller Concept – a combination tire that can also act as propeller (well, more like a ducted fan I guess). There's a neat video that goes with it, ...
CrossRoads's user avatar
  • 8,795
1 vote
0 answers
252 views

What are the effective span and lifting properties of a circular wing?

Today I read an article on FlightGlobal about the Bell air taxi demonstrator. It includes some paraphrased quotes from the Bell VP of innovation, Scott Drennan, among which the following stood out: ...
AEhere supports Monica's user avatar
-1 votes
3 answers
909 views

Would this hybrid impeller design create enough thrust for a VTOL aircraft?

I am wondering if combining a centrifugal blower impeller with an Archimedes screw impeller would create a hybrid impeller that would create enough thrust to lift up a VTOL aircraft. Please reference ...
user avatar
6 votes
2 answers
2k views

How to calculate the power required during transition from VTOL to fixed wing?

In a VTOL, I have calculated the power required for take off and cruise which was not difficult at all. Between take off and cruise, there is a phase where the VTOL has to transition by tilting the ...
sai teja's user avatar
  • 437
1 vote
4 answers
224 views

Would a propeller extracting air from a cylinder with holes in it be an ideal lift apparatus for a VTOL aircraft?

I am wondering if enough lift can be created for a VTOL aircraft using a propeller that is extracting air from a cylinder which is closed at one end and has holes in the top half of the cylinder. ...
user avatar
21 votes
5 answers
11k views

How does the F-35B not flip over during transition?

As the engine nozzle rotates, the lift-fan cannot. Wouldn't this imbalance of moments around the center of gravity result in the F-35 pitching up onto its back? As can be seen at 5:14 in this video: ...
AllTradesJack's user avatar
1 vote
1 answer
236 views

Can ailerons be used to control yaw and pitch [closed]

Is it possible for an aileron to be used to control the roll, pitch and yaw of a vtol drone
stuart iluobe's user avatar
1 vote
3 answers
1k views

Disadvantages of using thrust vectoring only in an aircraft with variable rotation nacelles such as the X-19

Take a quad tilt rotor aircraft such as the curtiss-wright X-19 or even a bi-tilt aircraft such as the V-22. What would be the advantages or disadvantages of using thrust vectoring only for control ...
Dara's user avatar
  • 11
2 votes
3 answers
644 views

Did any VTOL aircraft implement an airfoil with engine-blown exhaust?

Did any VTOL aircraft implement an airfoil with engine-blown exhaust?
Francis L.'s user avatar
  • 2,514
3 votes
2 answers
496 views

Does the Lilium VTOL wings produces lift during takeoff?

I just had a look on some of the recent development in the personal VTOL electrical aircrafts. I am wondering if the Lilium VTOL wings produces lift during takeoff? I would expect a quit high wind ...
Mokus's user avatar
  • 131