Motor ,Escape and wiring help please

This is the building forum for the Combat Boat 90. If you are interested in the STL's for this project, they are available to those who help me by contributing 15 Euro. Then you get access to a sub-forum where STL's, instructions and mods are located.
Posts: 3
Joined: Thu Jun 13, 2019 12:17 pm

Motor ,Escape and wiring help please

Postby Darren » Sun Nov 03, 2019 10:30 am

Hi Everyone .
I have bought all the equipment and just need help on the final wiring and tubing of the escapes to the motors to the water jets .
Also what direction does the left and right motors have to turn am I right in saying the left prop turns counter clockwise and the right prop clockwise ,so each motor turns in a separate direction .
Wiring and piping.jpg
Wiring and piping.jpg (2.9 MiB) Viewed 9308 times
I have attached a diagram of what I think is correct ,also have no idea where to plug in the to motors and servos to the receiver ,I am
new to RC so this is all a bit greek to me any help would be much appreciated .

Also what do you run the radar from ,I have a motor with gears that needs power but how do i wire it to be able to switch it on and off from the radio .

Please could you help in form of diagrams please ,I am sure there a few out there having the same problems as me .

Thank you in advance

Site Admin
Posts: 430
Joined: Thu Jan 11, 2018 7:46 pm

Re: Motor ,Escape and wiring help please

Postby admin » Sun Nov 03, 2019 6:29 pm


That looks OK, but a couple of remarks.

1. I presume you intend to have a connector between the battery and the speed controllers? :) It's not in the diagram so i thought better ask.

2. The speed controller powers the servos through what is called a "BEC" (Battery Eliminator Circuit) which means that when you have multiple motors, you will have multiple BEC's. This might become a problem as they sometimes don't like to be connected more than one to the same receiver. This is easily fixed by removing the red wire on one of the speed controllers RC-cable. With a tiny screw driver or knife you ca lift the plastic hook in the connector and slide the pin out and run a couple rounds of tape around it. This way you're not permanently damaging the speed controllers cable if you would like to use it for something else another time.

3. The wires between the speed controllers and the motors only determines the direction of rotation. When you have everyting connected preferably on the table before installing in the boat, run the motors and check which direction they are rotating and if any one of them is rotating the wrong way, switch any two of the tree wires and the motor will change rotation direction.

4. Channels - This depends on the radio you use as you have to program the transmitter for the mixes. There is no radio that has any preset that matches this boats functionality by default. It also depends on how you want to control it. If you want to maximize maneuverability you could for example use a two-stick radio and connect the buckets and nozzles on each stick so that you can control them individually.

My setup is based on an airplane radio that has the following layout:
ch1 - right stick horizontal (aileron)
ch2 - right stick vertical (elevator)
ch3 - left stick vertical (throttle)
ch4 - left stick horizontal (rudder)
A couple of aux switches and knobs.

It is programmed this way:
Speed controllers: ch3 as master and ch5 as slave
Steering nozzles: ch1 as master and ch2 as slave
Reversing buckets: ch6 and ch7 on an aux knob, both moves simultaneously.
Radar on ch8 with fixed position.

5. Radar - the easiest way of controlling a small DC-motor with a radio control is to use an old servo and remove the electronics. You simply open the bottom of the servo and remove the circuit board and the potentiometer and cut the wires to the motor. These wires are then soldered to the new motor you want to control. When connecting and powering up the radio you can then adjust both the rotation direction and speed with the potentiometer. But be careful not to try to run a too big motor with a tiny board, but for something like a radar using a tiny motor with a gearbox this works fine. Another solution is of course that you find a motor with enough gear reduction so that the radar will move with acceptable speed just by connecting the motor directly to the transmitters 5V. This can be done by using a connector similar to what the servos are using and only using the black and red which are GND and 5V.

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