Polars are hard to find for paragliders; anyway most pilots don’t fly with a wind speed probe. An EN-B glider polar is shown (8.4:1 best glide, -236 fpm). The company Compass (http://www.compass-italy.com/) has invented an instrument that will accurately measure polars … it would work for a hang glider too. It’s really impressive, and I would think the manufacturers would be all over this device. https://www.youtube.com/watch?v=E3bwG7vmZbY .