Once again Vans book figures are accurate. The -9 is max speed 170 knots. With any 1-2 knot error in the static/ airspeed system, and Conor and I have chased it being accurate, to get book figures is always comforting.
The tie down rings were a big difference, we noticed it on the -10 as maybe 4 knots worth of drag
Pierre, maybe you are running too far LOP? Or are you comparing MAX speed to your LOP speed? We can discuss by PM so not to corrupt this thread.
Great pics Conor!