You're probably thinking of the Piasecki Vectored Thrust Ducted Propeller (VTDP). For details of the AH-1 proposal, try <a href="http://avia.russian.ee/vertigo/piasecki_cobra-r.html" target="_blank">http://avia.russian.ee/vertigo/piasecki_cobra-r.html</a>. .. .A couple of years ago, Piasecki also won a $26m USN contract to flight test an SH-60F with the same ring tail design in 2003 (see <a href="http://www.nawcad.navy.mil/rotarywing/images/vtdp.jpg)." target="_blank">http://www.nawcad.navy.mil/rotarywing/images/vtdp.jpg).</a>. .. .For a full program update from Nick, Lu & co, you may want to try asking the question over on the Rotorheads forum.. .. .Cheers,. .T/shaft