What about the weight of the horizontal stabilizer?Â* Given that it
produces negative lift and contributes to the bending loads on the main
spar, is it considered a lifting part or part of the non lifting components?

On 10/19/2018 5:52 AM, Jonathan Walker wrote:
At 01:37 19 October 2018, Ouroboros wrote:
That TN doesn't increase the max weight without water, which is the
limiting number for this particular glider and the number that is not in
the manual.

Unless I am missing something all you need to know is the particular
gliders actual (not assumed manufactured) weight of the non-lifting parts.

The max pilot (actually payload, pilot / parachute / ballast weights /
onboard snacks etc) weight is then the lower of:

a) Weight of the actual non-lifting parts subtract from the manuals max
non-lifting parts weight of 230kg (507lbs).
Or
b) 115kg (253.4lbs) which the manuals max pilot weight.
Or
c) The max all up weight less the empty weight (very unlikely to come into
play)

This all assumes that the empty CofG limit is inside the manual
limitations.

The max weight without water is not relevant and most new aircraft don't
list it. You know the max non-lifting parts weight (the critical point due
to bending loads), and the max all up weight inc water
(undercarriage/structural and flight stress loads), then the difference has
to be all in the wings. The aircraft doesn't know if the wings weight is
structure or water so is happy to fly!



--
Dan, 5J