Viper marine esc's can make a loud whine which can scare fish. Mine makes a hell of a racket.
Hi Crafty.
With regards to the 'Whine' , this has happened to me on my latest build.
I had heard of it happening and had not been really bothered by it before, but this time it really was bad, so I thought a bit of research was needed. What was causing it !!!
My conclusions are that the Viper speed control sends out a mark space frequency to the motor and varies the spacing to increase the 'seen voltage' at the motor. (I hope I've got the tech terms roughly right )
Where was the noise actually coming from, I thought.
To this end, I have found that if you hold the motor in your hand, connected to your viper and R/X and switched on, the noise (vibration!) was NOT audible.
I concluded that the coil in the motor was being oscillated at around a few thousand killo cycles, which made the case of the motor vibrate in sympathy. When the motor was touched onto the deck of the boat, this acted like a speaker cone and produced a sympathetic audible whistle (or whine).
As all motors are embedded onto brackets to fix them down, then they will make this whine, depending on the materials used to secure them.
The secret (got there at last) is to insulate them from the structure of the boat. I have made a box , slightly larger than the motor and lined it with felt, and having checked that the prop is parallel and running true, clip the motor in with elastic rubber.
I did this previously on my Waverley build to hide the 'Gear wheels crunching' type of vibration noise. There was no whine this time, because I used a different speed controller.
You can see from the picture that the elastic bands can be attached to the lugs on the side of the box.
I hope this information helps all of you out there when selecting the best way to install motors on troublesome speed controllers.
ken