Apologies for the naming confusion
There are officially 3 Whisper models
Whisper motorglider 16m. ICAO designator WISP, SACAA designator X294
Whisper Express motorglider 12m. ICAO designator WISP, SACAA designator X294
Whisper X 8m.ICAO designator (not yet issued but requested WISX), SACAA deg actor X350