Paratech P Bi4

The Paratech P Bi4 is a Swiss two-place paraglider that was designed by Uwe Bernholz and produced by Paratech of Appenzell. It is now out of production.
Design and development.
The P Bi4 was designed as a tandem glider for flight training and as such was referred to as the Bi4, indicating "bi-place" or two seater.
The aircraft's span wing has 58 cells, a wing area of and an aspect ratio of 5.5:1. The crew weight range is . The glider is DHV 1-2Bipl certified.
The wing design includes "Permanent Air Flow", a feature by which the cell openings are made smaller to improve the leading edge profile.