Hello Sunnybob, you can use individial speed controllers if you want separate control over each motor or can use a single a single controler to control both, I run a 42" Riva Aquarama using 'Motors Direct' 11 pole 5000rpm motors pulling 10amps each via and Electronize 30 amp controller, with three blade 65mm racing props with no problem, without knowing the boat weight and the space in the motor compartment and battery compartment it is difficult to be precise, try Alistair at Motors direct (link on Stourbridge Model Boat Club site) or Electronize they are both more than helpful, regards, Aquarama.
