![]() But if the imbalance of forces is strong enough, if the drag overcomes lift, your seat will fell a 'negative weight', because the acceleration balance (gravitational/deceleration due to motion) will be negative. In the case that it is drag that prevails, things will be the other way round, and your seat will feel a smaller weight. imation of the ratio H/R 3/2, as indicated in figure 3. The excess will be exactly the mass of your body times the upward acceleration. as well as negative gs, where the body lifts from the seat, and must be held in place by. But, for the brief moment that lift prevails over drag, an upward acceleration will appear, and your seat will feel a higher weight. Drag will grow, and the forces will become balanced again. Now, let's suppose that lift increases suddenly. The weight felt by your seat will be constant. That depend on the balance of forces If the forces are balanced, there is no acceleration, and you are subjected to the Earth's gravitational field. While they were, during the ascending flight at constant velocity, no acceleration existed, either positive or negative, but if you reduce the lift, drag does -momentarily- prevail, the ascending velocity decreases, and a negative acceleration will appear. In the case of a gyro, suppose you are flying in ascending flight, that is, with a given vertical component, and if you reduce the vertical velocity (by closing the throttle, or by easing the stick forward) a negative acceleration will appear, because you are moving within the atmosphere, and forces (vertical lift - vertical drag) cease to be balanced. If that negative acceleration has a higher value than 9,8 m/s2, then you'll hit the roof. The air drag will slow down the rocket, inducing a negative acceleration in your body. Imagine you are moving upwards in a rocket, within the atmosphere, and that the rocket engine suddenly stops. You have 'negative Gs' when the balance is negative. I agree that negative Gs should be avoided and it would help me to understand what to avoid. I would like to understand what sequence of control inputs would cause a gyroplane to fly to negative Gs. The results were surprisingly (to me) similar for such different gyroplanes. 6 Gs or much above two Gs even in what I felt were very aggressive maneuvers in either aircraft. I had a G meter on both The Predator and Puff and I was not able to get much below. ![]() It is hard for me to understand how a gyroplane can accelerate downward faster than gravity (thirty two feet per second per second). I have been in a fixed wing in turbulence and had to tighten my seat belt to keep from hitting the roof with my head. I find it easy to see how a fixed wing can achieve negative Gs because its wing will work in either direction and the aircraft can be accelerated down ward. ![]() It is my understanding that Gs (gravity) is about acceleration. I read in many threads on the Rotary Wing Forum that negative Gs should be avoided in a gyroplane.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |