On Jan 24, 12:30*pm, Martin Gregorie
wrote:
...
By 'exposed spar stubs' I meant that there's no obvious tunnel, or top
and bottom guide channels, that the BRS webs could could go round the
outside of so they are guaranteed to be round the spars after the glider
is rigged: you'd need something like that to keep the webbing loop open
and let the spar stubs fit easily through them...

On the surface, it seems to me that attaching the parachute bridle to
the wing main spar stubs is not the optimal way to do it. In general,
I think I'd rather attach the bridle to the aircraft structure at the
forward and aft lift pin fittings. My thinking is that the lift
fitting structure is closer to the pilot along the primary load path
between the wings and the fuselage.

At issue is that there is usually no direct structural connection
between the wings and the fuselage at the wing main spar stubs, and
there are many conceivable failure modes that could disengage the
wings from the fuselage while leaving the fuselage otherwise intact.
That being the case, I'd rather grab the fuselage directly at its
strongest points rather than grab the wings that may or may not be
attached there.

Thanks, Bob K.