My words and as I haven't got such a polar-Rorschachtest-maker I just can present another way to measure at least my downwind vmg:
Horst Sergio wrote: ↑Tue Aug 08, 2017 7:04 pm...
The wind in the picture comes from the right side as the masthead fly showes. In the moment of the picture I (on the right corner) was around 600 m directly upwind of the ballon which was always around 40 m above ground (20 m diameter).
Medium wind was metered by movement of the ballon at its height to be around 14 knts, 15 m² Chrono V1, 16 m lines, Bionic back wing.
It tooks me 3 km to overtake the ballon
So my downwind VMG was around 18 knts. If the factor of being faster than the wind was 1,25 is not that clear as the wind is a katabatic one with sometimes pretty high gradient, anyway for sure I was a bit faster than the wind and had a nice private race and demonstration.
I admit Sonic-Cab Double Agent is a strange combo, Mossy. A few thoughts however:
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