We recommend interesting articles by Jacek Kobiesa, published in the Soaring Cafe. The author, a U.S. permanent resident, describes his experience of working in the former SZD, the first after many years visit to Bielsko and his impressions after flying SZD-54-2 Perkoz.
http://soaringcafe.com/2012/12/the-szd-50-puchacz/#9
http://soaringcafe.com/2012/12/szd-54-2-perkoz-part-2/
http://soaringcafe.com/2012/12/the-szd-50-puchacz/#9
http://soaringcafe.com/2012/12/szd-54-2-perkoz-part-2/