On Sunday, April 28, 2019 at 4:21:48 PM UTC-4, Soartech wrote:

With an 8 to 1 glide and sink rate of 255 fpm they would be very comparable to modern single surface hang gliders and they are easily soared often. XC flights of 100 miles or more have been done on such gliders by experienced pilots in good conditions.

A slow minimum sink speed allows a tighter turn radius to core very small thermals.