Thanks, guys !
I will soon revert more in details, to your replies.
Lee and Murraybrowne, nice setups and nice photos !!
Amazing to see, that your "monster" diesel
engines has been replaced with tiny electric motors, providing same power as the diesel
And with much more flexibility.
I think most buyers of secondhand yachts are thinking "oh, wow, that's an electric powered yacht, then the owner must be an electrical engineer
, so we will not buy that sh**".
(But again, what do the average sailor know in-deep about diesel engines ? :-)
The problem for this nice and clean, and maintenance
free technology is, that when we face a problem, not any backyard mechanic
can solve it. Then we're pretty much on our own, so far.
Like driving an electric car. That is why they still don't have a breakthru.
Any garage can pick up your car and fix your Toyota Corolla 2008, but NOT your Tesla 3.
So we're just doing it for the fun and joy of quiet sailing, definitely not for the resale value of the boat !!!
However, in case that your boat has some economic value, and you may need to sell her one bad day, try to keep your existing engine bay and setup intact, when making a conversion, so a new owner can throw in a new diesel, if they want to.
If still functional, use any existing engine frame bolt threads to mount your own DIY
frames for motors and batteries, etc.
Just a thought...
To make STALL / STOP clear :
When I mean a stall or a stop, it is not just related to the electric motor
drive itself, so please read it like this :
A STALL is a system breakdown, so you are unable to continue motoring during the cruise
. The failure could origin in any part of the system (wiring, motor, transmission
, controllers, battery
bank, etc.), but you were UNABLE to run the motor again on that trip.
A STOP means any malfunction
of the system that stopped your motoring, but could be fixed, so your cruise
Electric motors are in general weak in their construction.
Not supposed to support or withstand anything, just made to provide radial forces. And they do so very well, for the bucks.
When an electric motor
is connected via radial belt or chain drive to a shaft, it is flexible with great tolerance, and such a setup will not damage the motor and the motor shaft. Just look into your car engine bay, and take a look at the setup.
It also makes it possible to make easy adjustments to the gear
ratio, when the gear
wheels are exchangeable.
As we all have different boats, the tuning of each system (prop diameter and pitch/gear ratio/motor rpm/motor torque) all takes, that it is very convenient to be able to change the gear ratio in a smooth way ;-)
So, bottom line - it is BAD to connect an electric motor direct and axial to the shaft.
Never ever do it ! Even with flex couplings etc, you'll never end up happy with that !