Impressions of the work of the electric motor on the sailboat
I use the second year, in general I really like it. Further - in more detail.
In the first year, a 3:1 belt reduction was used.
Quite a working option, but I wanted to go further and use the motor without reduction, on a straight line.
Without the reduction I got some energy savings at low power (at average speed 3 knots instead of 800W -> 600W), but the motor turned out to be too weak in terms of torque for the boat to reach hull speed. We need a heavy motor with high torque, namely for a two-blade propeller 12 "x7" we need a nominal operating mode from the motor with a torque of 30 Newton meters for a rotation speed of 700 rpm (4.5 knots in calm water).
In general, such advantages in a purely electric version:
- the engine is always ready to work
- quiet operation
- elementary service (we can assume that it is not)
- you can forget about long motor transitions
In the hybrid version of the impression, I will write how it will be ready.
It is normal for an electric motor to run at low speeds. The larger the propeller and the slower it rotates, the greater its efficiency, so here the electric motor can slightly outperform the internal combustion engine in efficiency (but not in the operating time from a single charge / refueling, of course - lithium stores less energy than gasoline)