At 11:50 12 November 2013, Greg Delp wrote:
We tow with a Pawnee at our club as well. We were also having
issues with
t=
he tow speeds showing approximately 5-10 knots (10-15 mph)
slower on the
gl=
ider's ASI than on the Pawnee's. This spread worsened when
the Pawnee's
sid=
e window was open. ( we had a window latch that was loose
and occasionally
=
would open during takeoff or tow ) There was a very apparent
change in the
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pitch attitude required to maintain the proper indicated but
wrong actual
a=
irspeed and the glider pilots would request a faster tow speed.
I found
th=
e static line broken inside the fuselage, hidden between the
fuselage
fabri=
c and steel tubing next to a bracket near the throttle. This leak
obviousl=
y induced large errors into the static system especially with the
window
op=
en. I imagine this could be an issue with many of the Pawnees
around. The
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hard static line is very close to vibrating fabric and can also be
damaged
=
by ingress/egress from the cockpit if the fabric is pressed into
the line.
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The line eventually work hardened and broke in two.