HI I definitely recommend the Electronize FR 30 HX. I use two of these in my 52" Vosper fast patrol boat which has two Graupner 900 motors. I run both at 24 volts which the motors and speed controllers can easily handle. They are a quality esc with excellent repair back up.

HI Tugboatguy

I favour Electronize ESC my Amsterdam has a T.24v motor from mobile marein, this with 2 12v gel cells mainly for ballast, works fine. with a 90mm 4blade prop from propshop.

Hope this helps

Mark

HI tugboatguy
the specs for your motor are:
Motor Nominal Voltage Voltage Range No-Load RPM NO-Load Current Current @ Max Effic. Stalled Current Max Efficiency
Speed 900 BB TORQUE 12v 6-40v 6,500 1.1A 8A 54A 71%

Depending on the prop in use the current on load will probably be in 10-20 amp range. With a stall current of 54 amps you could need a 100 amp ESC but a 50 amp protected by a fuse would be OK. You should always fit a fuse less than the max ESC current. The alternative is to risk a fire and probable loss of your model.

I suggest you initially connect your motor to a 12v battery via a wattmeter (measures watts and current) and put the model in a test tank with the chosen prop and see how many amps the motor draws. This will be the current at heavy load so you can probably halve this for normal running.

With this info you can make an informed choice on the ESC. Generally you should have one that can handle a continuous current of twice your max running current.

I checked on the web and ESCs are available in the 50-100 amp range. Tower Hobbies came up on a Google search but there were others listed. You will need to check carefully that your chosen ESC has a reverse function if this is required for the model.

Good hunting
Dave