We have a pitot tube.. 1/4 " slightly protruding out from the front of the
nose inside a 2 " vent tube in the normal nose location. As I said before, I
will check my GPS ground speed on the next attempt.

I fly all kinds of gliders so I do know a slip well... but this is no slip.
Watch for that video!

I started at 40 mph and slowly went from 35 to 30 to 25 then 20 and then
zero. The video will show all of this on the instrument panel.....and I did
this more than once. I doubt that I actually got to zero..... but the
forward speed was definitely down about 20 or lower. I have boom mounted
turbine and will attach that on one of next flights.

-mat

"Kirk Stant" wrote in message
om...
"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