Its already happened I took to the air in a PW5.5 two years ago.
http://www.silentflight.com/P0003485.JPG
http://www.silentflight.com/P0003486.JPG
The Ventus does have the 16.6m tips and performs pretty much like the ASW17 so its not all down hill.
The 11M sparrow hawk sounds kinda interesting for out here because it should have a half decent wing loading.
Al