propeller

I've seen a few of these, examples being the Yak-15/Jumo Hybrids, the P-57 Airacobra, SAAB's J21R etc.. What others have you guys found across your researches?

The recent post on Bauhaus Luftfahrt led me to this brief description of a VTOL aircraft using Voith-Schneider propellers and the attached image on their web site. This was all news to me, so I was also pleased to find this great interactive demo of how a Voith-Schneider propeller actually...