On Wednesday, February 11, 2015 at 8:10:30 AM UTC-7, Dan Marotta wrote:
How can you "inadvertently fly into the yellow range and kiss the
red range"?* Sleeping at the helm?* You have to have quite a nose
down attitude to get near the red line and it doesn't sneak up on
you.* It's very noisy and pitch sensitive.



Don's advice below is excellent.






On 2/11/2015 3:20 AM, Don Johnstone
wrote:



At 02:58 11 February 2015, wrote:


If you inadvertently fly into the yellow range and kiss the red range,


and


=
you get into the high speed vibration, what is the best way to slow


before


=
the wings depart the glider. My sense is to reach for the spoilers and
slo=
wly extend to slow. Any opinions on that matter?



A very experienced test pilot once told me, and several others, that if you
were faced with exceeding VNE you should pull as hard as you can, even if
it means exceeding max G load, to reduce speed as soon as you can to below
VNE. Catastrophic structural failures due to excess G are very rare unless
there are other factors, catastrophic failures due to flutter are almost
inevitable.
There is no right answer, just a less wrong one and I would stress I have
not had the opportunity to test this.
One of the requirements on a Grob 103 post major inspection test flight was
to operate the spoilers at 70kts, having done this many times I would not
recommend the spoilers option.






--

Dan Marotta

Easier than you might think when flying at altitude, I inadvertently did it in my HP16T while going through a FAI Start for a 300k triangle at 12000 feet on a hot summer day, I was indicating 15kts under Red line when I experienced a low frequency elevator flutter, A gentle pull back on the stick and it stopped, probably lasted less than a second but definitely got my attention. A few minutes with an E6B, showed that my True Airspeed was well over VNE.

Brian