never-exceed speed

never-exceed speed (VNE)

never-exceed speed (VNE)click for a larger image
A typical VN diagram indicating region of never exceed speed.
The speed beyond which it is not safe to fly an aircraft. It is normally less than the maximum diving speed (VD). As it concerns rotary-wing aircraft, the never-exceed speed, VNE, must be established so that it is (i) not less than 40 knots calibrated air speed; and (ii) not more than 0.9 times the maximum forward speeds established, the maximum speed, or the maximum speed substantiated for advancing blade tip Mach number effects, whichever is the least. The VNE in this case may vary with altitude, RPM, temperature, and weight. The ASI (air speed indicator) is marked with a red radial line at this speed. See also redline condition.
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References in periodicals archive ?
Upper Red Radial: The airplane's never-exceed speed, VNE.
These give the Yankee a never-exceed speed (VNE) of 170 knots compared to the UH-1N which was limited to 130 knots.
One aspect of the article drew comments and criticism from readers, some of which were published in the Unicom section in our March issue, involved that article's statements referencing a fixed-wing aircraft's never-exceed speed ([V.
The never-exceed speed exists because we risk structural damage or failure if we fly the airplane beyond it, whether for reasons of encountering gusts which will overstress the airframe, to prevent flutter or other reasons, including the manufacturer's failure to test the aircraft beyond a certain airspeed.
The never-exceed speed is calculated by reference to the aircraft's design dive speed, or VD, and is limited to 0.
There are many reasons aircraft are certificated with a never-exceed speed, including the prevention of aerodynamic flutter, which can destroy an airframe in seconds.
NE] red-line or never-exceed speed of the aircraft is depicted by a red line on the aircraft airspeed indicator at the top of the yellow arc.
As this article's main text notes, an aircraft's never-exceed speed ([V.
The never-exceed speed (V (NE)) is a red radial marked on the airspeed indicator, but it can be a lie waiting to ambush the unwary.
As we also should know, the yellow arc's bottom range begins at the airplane's maximum structural cruising speed--Vno--while its upper limit is the never-exceed speed, Vne.
We've all been warned to watch out whenever our airspeed enters the yellow arc, and we've learned to absolutely stay away from never-exceed speed, [V.
True, the ailerons of certificated light planes are not supposed to exhibit aileron buzz even at never-exceed speed (red line), but it can--and it has--happened.