Great result Jon.

Cheers,
Stephen.

Think once it using the water and under load it will probably quieten further
Good luck

Hi Dave, I have had a play with the wiring this afternoon I wired the motors in series and bravo 80% quieter I can put up with that. I should think with the decking fitted it will be really quiet.

Cheers Dave much appreciated Thank you. 👍

Hi Jon
Hope you can find an acceptable solution. If you have a 12v battery you could try that and see if the higher voltage reduces the whine.
dave976

Hi Dave I have a new 400 motor at my Dads garage i will that a go and i will give a go wiring at wiring the motors in series. As you say having the deck on will help a lot to keep the noise down, i will try both ideas and let you know either way.

Thanks again for your help Jon.

Ok. Try connecting the motors in series and see if there is any difference. Do you have another motor you can connect to see if the noise is still present? I have looked on line and seen other posts with the same or similar problems. I suspect the motors are causing the noise but it will do no harm and may not be noticeable on the lake and is reported to reduce at higher speeds, which I suspect is how you will be running your model. Mounting the motors on rubber mounts is said to reduce the resonance but I suspect you will always have some noise. I would ignore as far as possible and with the deck on the noise may not be so noticeable.

Dave976

Hi, It is a little quieter with one ESC disconnected, disconnecting one motor makes no difference and of course with both there is no noise. i did the same with the other one and no difference on the other ESC and motors.

Ok so I think we need to start a process of elimination. Disconnect one esc and see if the noise is greater or smaller. Then disconnect one of the motors and see if any change. Do the same with the other Esc and its motors. Please advise what results you get so we can progress to the next step
Dave976

Hi Dave, I am using four Deans marine Kestrel five Motors 4.8 to 12 volts, Two Viper marine 20 ESC controllers, I have wired two motors joined together in parallel to the one ESC. I have also used a Y lead to join the two.

Cheers Jon

Hi Jon
The sound is caused by the frequency used by the ESCs. Used to be a problem several years ago with some ESCs. How have you connected each motor to its ESC - are they in series or parallel? The number of windings will affect the frequency (noise) produced so changing from say series to parallel may reduced the noise level. It would help to know the make and size of the motors and ESCs.
dave976

In which case my remarks do not apply.
Have used Y leads on brushed without problem though. They cannot be used on brushless

Hi Stepen, i am running four motors and I haven't had it on the water yet, it starts before the motors turn. Like dog whistle.

Cheers Jon.

Hi Stephen yes I am using a y lead, I have a another esc in my mtb it probably worth a try.

The motors are brushed.

Hi Mike,

Just wondering if you have run your motor without load, disconnecting the timing belts and still get the same resalt?

Cheers,
Stephen.

Hi, no it is more a dog whistle but saying that I suppose it depend On esc you are using.

Hi Muskrat,
Are we talking about Brushed or Brushless motor and controller?
I am guessing you have a "Y" lead if you are using one channel to control both ESCs.
Have you tried swapping the ESCs to see if the problem follows the faulty ESC?

Cheers,
Stephen.

Rather sounds like the "chucking" noises experienced with my Brave Borderer. RCGroups site has some history on this issue. Suggest also see my earlier blogs on the B.B.
Never totally cured it until both Turnigy brushless ESCs failed, followed by the programming card. No matter how much reprogramming to different settings, it was always there. Finally concluded those ESCs were just trouble.
Bought a couple of cheap "double sided" none programmable ones from Banggood. Problem solved. Since then have fitted these ESCs to several models and all work fine.
The Banggood ESC modulation is also much finer and can now operate around other models without fear of an erratic response causing mayhem.

Does it sound like this? if so the thoughts are its a faulty ESC not been able to access the appropriate Timing Set, [commonly known as motor 'Entrance Angle']
unfortunately I have not been able to solve this issue with my set up.