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16 votes
Accepted

What are those little pieces for on the C27J?

Those are vortex generators. In this case they are to mitigate bad handling if it loses the “worst case” (critical) engine: Seventeen vortex generators were added to the left-hand side of the ...
300D7309EF17's user avatar
  • 2,400
6 votes

How does rudder braking work?

I've always heard "rudder brakes" called toe brakes, but I think I understand what you mean. When you're operating the brakes, you're rotating the pedals about their centers using your ...
Chris's user avatar
  • 603
5 votes

Why does the Varieze need a metal wing connector?

For a concentrated load like a spar fitting where the bending load of the spar is transferred to the fuselage structure through bolts, you need a bearing surface (that is, the bore of the bolt hole) ...
John K's user avatar
  • 132k
5 votes

How are cockpit warning sounds recorded/chosen?

Like most things in aviation, they started out as something somebody thought was a good idea. Then once you try to put it in an aircraft, the regulatory agency (e.g., FAA) has to review it and put ...
Gerry's user avatar
  • 20k
4 votes

How does rudder braking work?

In addition to the answers and comments that clarify the potential confusion between 'normal' rudder controls and wheel braking with rudder toe-brakes, I thought it might be interesting to add that at ...
Mick Waites's user avatar
4 votes

What different intake designs are there, and what are their pros and cons?

It is mostly a tradeoff between complexity and speed. High speed inlets not only fundamentally need to be more complex for efficient operation (more oblique shocks required before the normal shock), ...
Rob McDonald's user avatar
  • 13.1k
3 votes

Do vtails need twin horizontal trim tabs?

Not necessarily. Although the well-known Beechcraft Bonanza has twin tabs, Sometimes one trim tab, usually the left one, will be offset slightly while the right tab is flush with the control surface....
Camille Goudeseune's user avatar
2 votes

Can smaller wing area improve the aircraft experience during turbulence?

Gust analysis is a quite complex matter, so complex that big airplane companies have dedicated departments only for this topic. Anyway an easy way to understand how a gust influences the flight ...
sophit's user avatar
  • 13.5k
2 votes

why does the bottom of a 737 - 800 engine look slightly flat?

The 737 was designed in the 1960s, when high-bypass turbofans didn't exist, so the engines were narrow, but inefficient. It was also designed to use built-in airstairs, for small local airports that ...
Therac's user avatar
  • 27.6k
2 votes

How do the landing gears support so much mass?

In addition to the number of tires and strength of the landing gear, an important factor is pressure. Typical car tire pressure is on the order of 35 PSI. Typical large airplane tire pressure is on ...
manassehkatz-Moving 2 Codidact's user avatar
2 votes
Accepted

How do the landing gears support so much mass?

I think your question is based on a perception that isn't shared by all. Yes, airplanes can be very large, and numerically quite heavy when loaded at max gross, but appearances can be deceiving and ...
Michael Hall's user avatar
  • 26.9k
2 votes

How do the landing gears support so much mass?

That's quite easy: you split the weight among several wheels (22 for an A380 for example) and design the landing gears strong enough (their weight can be as high as 8% of the empty weight, ...
sophit's user avatar
  • 13.5k
1 vote

Holding time during static structural testing of a composite wing

The testing of composite wings I witnessed held the highest load for three seconds in order to pass the test. If you put high loads on a composite structure for the first time, you will get some minor ...
Peter Kämpf's user avatar
1 vote

What's gonna be the physics behind building 'futuristic' airplanes? Use physics formulas or even theories to answer this question

There are many possible answers to your question, so I'll give a try. New and future aircraft are defined by the technologies that go into them. Developing a new aircraft is very expensive, failure ...
Rob McDonald's user avatar
  • 13.1k
1 vote

How to determine dihedral angle?

“High-wing airplanes often have little or no dihedral [or even anhedral], whereas many low-wing airplanes have geometric dihedral angles of as much as 10 deg.” Airplane Flight Dynamics and Automatic ...
AeroAndy's user avatar
  • 116
1 vote

Could an aircraft be tied down, then throttle up and release for takeoff in order to use a shorter runway?

Yes. For example, this F-104C was chained to a truck full of weights, throttled up, and released to set a time-to-altitude record, at Edwards AFB on 1959 Dec 14. Photo and details from here.
Camille Goudeseune's user avatar

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