It really only makes sense in a scale application if you need to have forward/reverse, here is a nice example with two RCV four strokes in a Riva "Aquarama", electric start reverse and clutch(time two!):
http://www.rcgroups.com/forums/showt...7#post19741506
http://www.bmbtechnik.de/aquariva.html
All custom build, money no object
Despite all that work the run is less than impressive, a bad case of "over engineering"
