![]() I took the mandated addition training (SFAR 73) after some airplane pilots killed themselves in R-22s. I fly a fully-articulated rotor now, but I used to fly R-22s ( great little heli, BTW). In upright flight, in a pushover, the seat might be pushing on me with only 80 pounds (1/2) or zero pounds (“zero gee”) or even pulling on the straps (negative gees!).Īnd, Johnny LA, if your helio has a teetering rotor, you don’t want to go negative. In and airplane that’s in steady inverted flight, I’d be in a load factor of -1, that is, my 160 pounds would be hanging on the seatbelts. Anything I might be holding in my hand would “feel” twice as heavy. In an airplane in a 60 degree bank turn, I’d still weigh 160 pounds, but the seat of the airplane would have to push on my butt with 320 pounds of force (2 times) to get me to move through the turn. The chair holds me up with 160 pounds of force. No big mystery.Īs I sit in this chair, my weight is 160 pounds. The g’s is just a conversational way of relating the forces that you have internal to the object to what they would be in a “normal” one g gravitational field. Now, why to people call this “g’s”, especially when it is really dimensionless? Well, it sounds really cool - guys like Chuck Yeager say “there I was, pulling 8 g’s and my caution/warning panel lit up like a Christmas tree!” In most cases, you’re only interested in forces in the same direction (more or less) as gravity. The sign is determined by whether the other forces are in opposition to gravity (positive) or in the same direction (negative). Take the sum of all forces other than gravity acting on something, and divide by the weight of the “thing” you’re talking about. ![]() It is better to start with Load Factor, an aeronautical term, and that’s what we’re really talking about. Let me try to describe what “pulling g’s” means. After a few seconds of red out, they are rendered unconscious and will quite likely hit the ground at high speed and die. Around 4 1/2 or 5 negative g’s, they experience “red out,” which is an effect of all of their blood being forced into their heads by the negative g-forces. ![]() Negative g’s aren’t necessarily a “floating” experience, they’re a “being hurled at the ceiling” experience.įighter pilots pull negative g’s when the push forward on the stick and make the plane fall out from under them. 3 negative g’s send you there with three times your full weight. One negative g sends you toward the ceiling with your full weight. One g puts you on the floor with your regular weight, 3 g’s puts you there with three times your weight. Pulling zero g would be floating (like in interplanetary space). Imagine it this way - no outside forces acting on you to confuse things. In this scenario the one g and one negative g cancel each other out. But you’re not “floating” unless you’re only pulling one negative g in a one g environment like, well, the world around you.
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