ORIGINAL: onewasp
ORIGINAL: RCHUGHES
ORIGINAL: onewasp
So long as we have Bruce's attention.........
Would you please comment on ''flight'' (I use the word loosely) on any plane with the CG located behind (that doesn't mean .001'') the neutral point !
My remarks on this are included in post #15.............and I'm still impressed !!!!!!!!
you can get back up all you want but I know other people on this forum that can Back up my comments, A plane can fly with a CG past the Neutral point I have done it, I know other people that have done it, with the right Airframe it actually does not fly bad at all, does it really matter to you that much??
Relationship to aircraft and missile stability and control
* If the center of gravity (CG) of an aircraft is forward of the neutral point, or the CG of a missile is forward of the center of pressure, the vehicle will respond to a disturbance by producing an aerodynamic moment that returns the angle of attack of the vehicle towards the angle that existed prior to the disturbance.
* If the CG of an aircraft is behind the neutral point, or the CG of a missile is behind the center of pressure, the vehicle will respond to a disturbance by producing an aerodynamic moment that continues to drive the angle of attack of the vehicle further away from the starting position.
The first condition above is positive static stability. In missile analysis this is described as positive static margin. (In aircraft analysis it may be described as negative static margin.)
The second condition above is negative static stability. In missile analysis this is defined as negative static margin. (In aircraft analysis it may be described as positive static margin.)
Depending on the static margin, humans may not be able to use control inputs to the elevators to control the pitch of the vehicle. Typically, computer based autopilots are required to control the vehicle when it has negative static stability - usually described as negative static margin.
Reminds me of the tongue in cheek def. of understeer and oversteer.
"If you go thru the fence nose first, the car has understeer- etc.."
My old Chev powered Healey, had definate oversteer (CG was 45/55, front to rear).
My TR3 had -well understeer plus under power