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40 votes
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Why do we feel gravity on a plane?

This is the difference between flying and in orbit. In orbit, you are indeed falling toward the earth, but the spacecraft is too, and you're going fast enough that you keep missing the earth. In an ...
Greg Hewgill's user avatar
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36 votes

People in a rollercoaster or falling elevator feel the rapid descent, so why don't pilots in the cockpit?

You only feel the acceleration downward. In roller-coaster this sensation is maximized for maximum thrill. A stall isn't instant: some parts of the wing can be stalled while the rest still provides ...
ratchet freak's user avatar
30 votes

People in a rollercoaster or falling elevator feel the rapid descent, so why don't pilots in the cockpit?

You only feel the plunging sensation during the initial downward acceleration. Once stabilized at a constant rate of descent, things feel normal again. The other thing is, the amount of vertical ...
John K's user avatar
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28 votes
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What kind of g-forces do birds experience and how does it compare to humans?

Birds regularly experience up 10-14 G according to this website. After looking at how birds and insects fly, scientists came up with the conclusion as to how birds cope with this is because: ...
anonymous's user avatar
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26 votes

Why do we feel gravity on a plane?

Why do we feel gravity on a plane? Exactly for the reasons we feel gravity when traveling on a train: We're not free falling (the cabin floor prevents this to happen). We're not at orbital speed ...
mins's user avatar
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24 votes
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How much g-force is experienced in a 45° turn?

The formula for the load factor $n_z$ in a turn is $$n_z = \frac{1}{cos\phi}$$ where $\phi$ is the bank angle. This makes the load factor in a 45° turn 1.414 or $\sqrt{2}$. Since Michael correctly ...
Peter Kämpf's user avatar
24 votes
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Can a barrel roll really be executed at a constant 1G?

You are absolutely right, a load factor of greater than 1 is impossible to avoid in a proper barrel roll. The barrel part of its name comes from the spiral path the aircraft needs to perform in order ...
Peter Kämpf's user avatar
18 votes
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Is it possible to fly with lower than 1 g-force?

In the same way that if you ride an elevator or lift downwards as it starts to descend you experience a lighter than normal feeling, you are accelerating downwards so experience less than one G. For ...
GremlinWranger's user avatar
14 votes
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How do pilots make rudder inputs during negative G flight?

The short answer is that at negative 2 G, the airframe limit for the A7-E, it took little effort to keep your feet on the rudder pedals. In controlled flight there are aircraft limitations on both ...
Aaron's user avatar
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12 votes

How much g-force is experienced in a 45° turn?

The G forces (also known as the load factor) experienced by an aircraft and its occupants do not scale linearly with the bank angle of the aircraft. Assuming constant vertical speed, coordinated ...
user's user avatar
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12 votes

Why do we feel gravity on a plane?

You never actually “feel gravity” at all†, not in orbit, not on a plane and not on solid ground either. What you do feel on ground is the earth pushing against your feet, with a ...
leftaroundabout's user avatar
10 votes

People in a rollercoaster or falling elevator feel the rapid descent, so why don't pilots in the cockpit?

You are forgetting one large difference between an aircraft moving through the air (still generating some lift), and an object in free-fall. Constant velocity in a gravity well (such as on the Earth) ...
Tyzoid's user avatar
  • 215
8 votes

Why do we feel gravity on a plane?

We are, the speed is not sufficient for this to be easily observable. We are actually a little bit lighter while in a plane, because it is also circling the Earth, just like a spaceship does, but even ...
h22's user avatar
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8 votes

Is it centrifugal force that allows a non-aerodynamic body to achieve lift purely because of thrust?

Basically, you're asking 'Can you achieve orbital velocity in atmospheric conditions?'. Orbital velocity is approximately equal to $$v_o \approx \sqrt{\dfrac{GM}{r}}$$ which, if we fill it in at ...
Sanchises's user avatar
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7 votes
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What are maximum G forces humans can survive?

I read that very high g forces could kill a pilot, brain pushing into the skull. High G-Forces cause blood flow to the brain to be impeded due to blood pooling low in the body under high ...
Dave's user avatar
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7 votes
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Does headwind on takeoff affect g force?

In the takeoff run, the acceleration is less with headwind, but once in flight, the airplane flies within the mass of air. The fact that that mass may move in relation with the ground doesn't affect ...
xxavier's user avatar
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7 votes

Is it possible to fly with lower than 1 g-force?

"G-force" refers to the apparent inertial force that is "felt" by the pilot and the other contents in an aircraft as it accelerates. For example, if an aircraft is accelerating ...
quiet flyer's user avatar
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6 votes

Can one fly up side down while a glass of water keeps full due to g-forces?

Yes, as long as you continue the loop, and don't fly the plane in the upside-down position. See, for example: Barrel roll with a glass of water on a glider
doppelfish's user avatar
6 votes

What are maximum G forces humans can survive?

I read that very high g forces could kill a pilot, brain pushing into the skull. Not really. Humans who have been killed by very high accelerations (in the order of tens to hundreds of gs for a ...
Peter Kämpf's user avatar
6 votes

People in a rollercoaster or falling elevator feel the rapid descent, so why don't pilots in the cockpit?

Sensation of motion can come through three of the physical senses. Each of the three senses is successively unavailable as we move through the examples of an amusement park ride, the plummeting ...
2NinerRomeo's user avatar
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6 votes
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When flying on a glide slope, does the G meter show 1G or less?

I presume, an implicit assumption in your question is that we are flying a perfect glideslope, that is, a straight line with a constant speed, and without disturbances. If this is the case, the ...
Zeus's user avatar
  • 9,083
5 votes

Can hypersonic aircraft be agile without the G forces harming the pilot?

Well, 2 G's is 2 G's, regardless of what speed you're flying. A level (coordinated) turn with 60 degrees of bank is 2 G's, regardless of your airspeed. What changes is your turn rate and turn radius;...
Ralph J's user avatar
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5 votes

How do pilots make rudder inputs during negative G flight?

I fly an aerobatic airplane. My G meter goes to -5 and I've pegged it before. My plane (& most aerobatic planes I've seen) don't have foot straps. During a negative G maneuver, it's pretty ...
Dan Pichelman's user avatar
5 votes
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Does Buoyant Lift Force scale with Load Factor?

It would probably be easier to think of it as a 50,000kg aircraft with a "normal" wing. This untruth will make calculating accelerations and turn rate incorrect (because the actual mass will make it ...
BowlOfRed's user avatar
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5 votes

Why do we feel gravity on a plane?

It is not a gravity, you feel, but the floor (seat etc.) pushing against you. You never feel gravity per se, you feel forces on your body which counteract gravity pull. In the flying airplane these ...
Martin's user avatar
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5 votes
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What is the average g force experienced on takeoff for an ultralight?

I fly part 103, specifically a Hy-Tek Hurricane. I also have a G meter on board. It is a Dynon D2, which features an artificial horizon (attitude indicator) and also a G meter. The average G's on ...
Dylan Quincey's user avatar
5 votes

People in a rollercoaster or falling elevator feel the rapid descent, so why don't pilots in the cockpit?

A few things. That accident took place at night and in IMC while the aircraft was passing through a storm which I suspect had quite a bit of turbulence in its core. This would most likely have ...
Romeo_4808N's user avatar
  • 74.1k
5 votes

When flying on a glide slope, does the G meter show 1G or less?

the G meter measures acceleration. If you are descending at constant vertical speed or climbing at constant vertical speed, it will read 1G. The difference in the force of gravity between that at the ...
niels nielsen's user avatar
5 votes

Why do we feel negative G-forces in a high speed descent in a pressurized aircraft cabin?

There are two misconceptions here, lets sort them out first: pressurization has absolutely no effect on G -forces. For any maneuver they will be exactly the same, wheter you are in a pressurized, ...
Jpe61's user avatar
  • 29.1k
5 votes
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What is the G Force graph of the limits of tolerance of humans to linear acceleration in the laying position?

As you stated there are no exact plots for human g-force tolerance in laying position readily availlable. We can, however, use the graph you linked, which is based on work of Dr. Mike Rickards: The ...
Jpe61's user avatar
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