At 15:12 23 November 2003, Andy Durbin wrote:
For the ASW-19b and the ASW-28, the gliders I have
most recent
experience in, the aft cg limit moves forward as the
gross weight
increases. I assume this is true for other glider
types but I don't
have data available.

Is it possible you're mixing apples & oranges? The
July 1977 ASW 20 handbook Flight manual p.18 lists
a firm *in flight* cg range of 240 mm (9.45') to 360
mm (14.17') aft of datum, with the datum being the
leading edge of the wing at the wing root rib, excluding
the fillet of the wing/fuselage fairing.

Assuming similar wording in the '19 & '28 manuals,
I think you're confusing this with a table shown elsewhere
in the manual, entitled 'Empty Weight c of g positions
and limits.' Here, it does appear the minimum cockpit
load increases (and aft cg shifts forward) at higher
weights. Please note, however, that the x axis represent
the EMPTY CG and the Y axis represents EMPTY weight.


Per wording in the '20 manual at p. 30a, this table
is to be used when tail ballast requires a re-calculation
of the minimum cockpit load. This re-calculation is
needed because the *flight* cg must be within the *flight*
limits.

Clear as mud, huh?

Judy