Fly in Cockpit: Does It Feel 5 Gs?

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Discussion Overview

The discussion revolves around the effects of acceleration forces on a fly inside an aircraft cockpit during a maneuver that subjects the aircraft to 5 Gs. Participants explore whether the fly experiences the same forces as the aircraft and the implications of these forces on its movement within the cockpit.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that when the aircraft pulls 5 Gs, the fly would smash into the floor due to the acceleration forces acting on it, similar to how a passenger feels pressed into their seat.
  • Another participant compares the fly's situation to that of a helium balloon, arguing that while the balloon remains unaffected due to its equilibrium with the surrounding air, the fly, being heavier than air, would experience an increase in effective weight and potentially fall to the floor unless it can compensate by flapping its wings faster.
  • A different perspective is presented, questioning the initial claims by suggesting that the fly might be pushed back rather than down, depending on the nature of the aircraft's acceleration (upward versus forward).
  • One participant clarifies that pulling Gs involves changing from a straight flight path to a curved one, which would cause the fly to continue in a straight line while the aircraft curves upwards, leading it to meet the cockpit floor.

Areas of Agreement / Disagreement

Participants express differing views on the fly's behavior during the acceleration, with some asserting it would hit the floor while others question the mechanics of its movement, indicating that the discussion remains unresolved.

Contextual Notes

Participants rely on various assumptions about the forces acting on the fly and the nature of the aircraft's acceleration, which may not be fully articulated or agreed upon.

CleanSweep
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A friend of mine likes to e-mail me a question of the day. I need a little help on this one.

When you close the canopy on your aircraft you notice there is a fly inside. You then takeoff and get up to altitude. The fly is flying inside the cockpit when you put 5 Gs on the aircraft - question - is the flying pulling 5 Gs too? And, if not, will the fly splatter against the windscreen as you pull 5 Gs?
 
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Im assuming you're asking pulling positive 'g's and not negative. In that case, the fly would smash into the floor of the aircraft, for the same reason that your rear end gets smashed into the seat when you pull the g's. acceleration forces in the positive range cause the aircraft to 'accelerate', thus the fly who is flying his own flight would meet the aircrafts floor.
 
To help clarify, let me provide another example: a helium balloon that is at equilibrium with the air in the cockpit (not rising to the top or falling to the bottom). Since it weighs exactly the same as the surrounding air, pulling g's would not affect it.

But a fly weighs more than the surrounding air. It's flapping it's wings to create lift equivalent to it's weight. When the plane pulls 5 g's, the fly's weight goes up 5x and it falls to the floor unless it can beat it's wings faster.

Welcome aboard, both of you.
 
i don't understand, because you guys are saying the fly meets the ground when you are "pulling" 5gs i don't uderstand why the fly hits the ground would he be pushed to back if you were accelerating forward, or maybe you are not acceleration forward you are pulling up causing the increase in gs.

i don't know...
 
When you "pull g" in an aircraft what you are doing is changing the straigh flight path into a curved flight path upwards. So when the aircraft is following that curve, Newton has ordered that things, not forced to do something else, to continue moving in a straigth line. So that straight line of the fly eventually meets the cockpit floor in its curved path upwards.
 
Thanks to all for your help.
 

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