Linked Questions

9
votes
5answers
1k views

Can wing-tip vortices be reduced/eliminated with a rear-facing propeller near the wing-tip?

Let's say we have a propeller-driven aircraft in the pusher configuration (rear-facing propellers). If we could somehow put an engine at the wing tip (ignoring structural concerns), and maybe make the ...
9
votes
1answer
1k views

Minix wingtip vortices mitigation - How does it work?

I stumbled upon this article: Minix wing tip device promises 6% gain in fuel efficiency for airliners. Such an economy is appealing and I must confess the design is "sexy". Could someone expand a ...
8
votes
1answer
2k views

Why are aircraft designed so that the wing stalls before the tail?

I read somewhere that conventional aircraft are designed so that the main wing always stalls before the tailplane. Why is that? My concern is that if the wing stalls, suddenly the tail will push the ...
8
votes
3answers
503 views

Are there areas to avoid while flying formation with a larger aircraft?

Consider a fighter jet flying formation with an airliner-size aircraft, such as during an interception or mid-air refueling. Are there areas which should be avoided by the fighter jet? I.e. are there ...
8
votes
1answer
780 views

Lift distribution on biplanes

This Wikipedia page about biplanes says in a wing of aspect ratio 6, and a wing separation distance of one chord length, the biplane configuration will only produce about 20 percent more lift than ...
7
votes
7answers
3k views

Does an aircraft landing on a carrier increase the carrier weight before it touches down? [closed]

The same question goes for any runway, but I guess that for small aircraft carriers, one might actually be able to measure the exact point of weight increases (e.g. measure the submersion of the hull)....
7
votes
2answers
2k views

Why does wake turbulence sink?

There has been a remarkable story this week of a Challenger 604 business jet being rolled after encountering the wake turbulence of an A380. A Challenger 604 at FL340 operating from Male-Abu Dhabi ...
7
votes
3answers
4k views

How is drag created from wingtip vortices?

What is the reason for the drag due to wingtip vortices? This question is about (general) performance, but doesn't answer the drag aspect.
7
votes
3answers
3k views

Is induced drag caused because of the tilt of the wing backwards?

In this question: Why is induced drag less on a high span wing? In the answer it was stated that wing tip vortices do not cause induced drag. If this is the case then what causes the induced drag. ...
6
votes
2answers
3k views

Why is induced drag less on a high span wing?

I have a basic question and sorry if it is a well known fact. I understand that the induced drag is due to the tip vortices changing the effective angle of attack (downwash). I searched some ...
6
votes
2answers
1k views

Why there is no wake turbulence right after touch down or before rotation?

It is said that wake turbulence occurs when an aircraft generates lift and there is no wake turbulence after touch down or before take off. That's how we avoid wake turbulence. However, I've thought ...
6
votes
2answers
2k views

The stronger the headwind the faster the plane flies if it is in the reverse command regime?

Revision 3. Clarifications, as required by moderators, added. The main reason for asking the question provided. Regarding the reverse command regime of a plane Assuming a plane hovers (ground speed $...
4
votes
1answer
737 views

Where does upward momentum come from in leading edge vortex?

I believe I am beginning to understand how a leading edge vortex creates lift. Faster air creates a lower pressure above the wing making lift. But I am hoping to get another view of this in terms of ...
4
votes
1answer
2k views

What are the pros and cons of a lift fan versus a helicopter?

F-35 uses lift fan which can create 20,000 lbs (9 tonnes) of lift in a small compact platform. I can see three or four of such lift fans that could lift a heavier plane and is seems better than a ...
4
votes
2answers
2k views

Stalls: which flight control surface is effective last?

In an aerodynamic stall, which flight control surface (limited to ailerons, elevators and rudder) remains effective for the longest period of time during the stalling condition? In other words, which ...

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