On Saturday, July 27, 2019 at 8:40:41 PM UTC-6, wrote:
Longer wings are better for weaker conditions. As mentioned before, the 17.6 meter wing make the glider "fish tail" a bit in a straight line flight.
Dan

I get this in my Kestrel 19, but always considered it to be resulting from rudder flow and the lack of good sealing so the flow attaches and detaches side to side, e.g. laminar to turbulent, thus the movement.

However, you seem to describe something that happens on your Ventus that doesn't happen with in the 15m configuration, is that correct?

Frank Whiteley