"Marske Flying Wings" wrote in message

When I pulled the stick all the way back slowly I suddenly found
that my airspeed had fallen to zero where I held it for quite some time and
my sink rate was 100 down.

Must be that antigravity effect that flying wings are famous for...or
maybe you had an inadvertent deployment of a recovery parachute.

Seriously, Matt, what you probably saw is the same thing most gliders
do when put into a severe slip - the pitot gets masked or moves into
turbulent airflow and no longer indicates your actual airspeed. Ditto
with the rate of sink, perhaps (static port location?). Where is your
pitot located?

Do you have a GPS logger trace of this event? That should show what
your actual groundspeed (and sink rate, with the right software) was.
Repeat the exercise upwind and downwind, then tell us what really
happened.

Meanwhile, enjoy your wing!

Kirk
Happy with the nice, long, beautiful tail of my LS6