At 09:19 14 December 2016, Jim White wrote:
At 01:59 14 December 2016, wrote:

Don, you brought up the old pitch-up myth so I'll go there.

Pitch-up on acceleration can only happen with the tailwheel in the ai
and
=
that can only happen if the glider is slowly dragged into the air with
feeb=
le acceleration and THEN strong acceleration applied. It can't happen
if
s=
trong acceleration is applied at the very start of the ground roll and
main=
tained until the glider reaches the normal airspeed for rotating into
the
c=
limb.

I could go on at length about this but I wrote a long paper on it
available=
here https://dl.dropboxusercontent.com/u/...cceleration.pd
Rather
=
than take my word for it, I very strongly suggest the BGA and
other
nationa=
l clubs do their own investigation using tension loggers. What you will
se=
e may terrify you.


Hi Bill. If you follow URAS you will see that Don, whilst old and wise
doesn't speak for the UK gliding community.

Hi Bill,

The theory may be correct but I can assure you that a K18 ALWAYS needs the
application of almost full forward stck after lift off to prevent over
rotation. This is using a powerful V8 winch with about 2 seconds of ground
roll. Yes the accleration is still happening after lift off. With a narrow
steel drum throttle response is never instantaneous due to inertia of the
drum, even with the powerful (300 hp+) V8.