Originally Posted by conrad907
Either a water rudder, or dual ESC's for engine steering. (Is this realistic?)...
You'll find several threads on differential thrust steering in the Waterplanes forum http://www.rcgroups.com/waterplanes-174/
Many there say that it's essential.
I toyed with the idea on my DH-89 (just for fun since it has a steerable tail wheel and doesn't really need it) but backed off after realizing that the fail safe mode for the Spectrum receiver would potentially leave one motor spinning if the signal was lost.
Wasn't really worth the risk in the Rapide's case.