"Eric Greenwell" wrote in message
...
Mark Navarre wrote:

As speed increases, the nose will come up (away from vertical) even if
you
don't want it to, and even with full forward trim, it would still
require an
honest push on the stick to maintain that attitude.


Not true with all gliders. Several modern racing ships will, when
trimmed
within CG limits for best climb performance, "tuck" or pitch down with
increasing airspeed, resulting in a large outside loop or exceeding VNE
without
pilot input. The crossover speed for this in my own ship is about 115
kts,
above which slight back pressure is needed to maintain speed.

Which glider is that? I thought a pitch-up tendency with increasing
speed was a certification requirement? And what is the CG position for
this to happen? Is this "feature" mentioned in the flight manaul? Sounds
kind of scary.

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Eric Greenwell
Washington State
USA


Though it was certainly not a "modern racing ship" my old Lark IS28 would go
neutral pitch stability at about 90 knots and become very nose heavy above
that even with negative flaps.

Bill Daniels
Nimbus 2C