At 10:16 AM 7/3/04 -0500, you wrote: >The maximum velocities allowed are Va in turbulent air and Vne in smooth air >conditions. >Your aircrafts Vne is an indicator of speed, in smooth air conditions, where >permanent distortion or control flutter may occur. As stated, you can fly >at Vne in safety, but you cannot expect to make sudden maneuvers at this >speed or fly in turbulence without possible damage. >Larry A Capps +++++++++++++++++++++++++++++++++++++++++++++++++++++++
Here is another "twist" to add to the Vne topic. I got it for the following web page: http://www.auf.asn.au/groundschool/umodule2.html#vspeed With a 3 degree washout on a plans-built KR this twisting motion could be significant and make it unsafe to exceed Vne even in smooth air. I've never pushed my KR beyond 180 mph indicated and probably won't as mine is rather heavy. I'll use the fact that I have tanks built in to the outer wing panels, from root to tip, that will act to stiffen the wing as a safety factor. Larry Flesner Vne never exceed speed. The speed which must not be exceeded in a glide or dive or other manoeuvre in smooth air. The red line at the top end of the ASI yellow arc, usually 90% of the 'design diving speed' Vd which latter is usually 1.4 times Vno. Vne is set at 90% of Vd to provide a flutter margin. Exceeding Vd is the realm of the test pilot who always wears a parachute! There is another speed which, hopefully, is greater than Vd; this is the comfortably named 'wing divergence speed' where the extreme rearward position of the centre of pressure at very low (below zero) angles of attack prompts a twisting action on the wing structure causing them to separate from the airframe. º Vno maximum structural cruise speed. The top end of the ASI green arc. When cruising at, and below, Vno the aircraft should not be damaged by a 30 feet/second vertical gust, which is in the top end of the moderate turbulence scale of 20 35 feet/second vertical gusts. (Notwithstanding that, when moderate turbulence is encountered airspeed should be reduced to Va.) Flight above Vno should only be conducted cautiously and in smooth air. Vno must be greater than, or at least equal to, Vc.
