| i built a RC boat for my son for xmas, its a twin motor hull, i too had the same dilemma, how do i set up the model for him, what would be reliable, what would be good in terms of operating, and ultimately what is the best option for the job.....
so the decision was made - it has no rudders, no nozzles just 2 props !
control is via a esc/mixer in one unit, the board is made by a club member who retails these units...they are ideal for 2 channel boats or tanks
the mixer/ esc/ board independantly controls each motor, so on a standard 2 channel set up if you move the left transmitter stick forward both motors run at full power in the same direction, if you do left stick back then both motors run at full power in reverse, the speed is fully proportional in both directions.....
the steering is controlled in 2 ways
if forward or reverse propulsion is activated and over about approx 40 % of max speed then one motor slows down to facilitate a turn- both motors continue run in the same direction...
if propulsion speed is activated and its low ( less than approx 40% of full power ) then when the steering stick is moved then one motor will actually run in reverse so the model will turn- the two motors will run in opposite directions to facilitate the turn in a speedy manner.
if there is no forward or reverse propulsion applied but the steering stick is moved then the motors will run in opposing directions - one in forward and one in reverse and the model will spin on the spot....
it means very manouverable models, ideal for steering regattas !- the other advantage is this esc/ mixer board also has bec fitted and it means for my sons model boat there is no servos needed !
the board/ mixer/ esc plugs directly into the 2 receiver outputs, and the bec eliminates the need for RX batteries.
the mixer will ocntrol any motor up to 15 amp output and inputs upto 15 volts
and all this for the cost of a standard basic esc !
pm mee if you want more details |