Swedish Boat Manufacturer Builds Super Efficient Electric Motor

Candela, a Swedish manufacturer of premium electric boats, has overcome three major design challenges to produce a highly efficient electric boat motor. Known as the C-Pod, the new motor relies on a compact patented design that weighs only 50 kg.


The manufacturer’s innovative design boasts of a long lifespan as well. In general, electric motors deliver consistent performance for long periods. Many types of equipment in industrial settings employ electric motors for their durability.

Even so, individuals and companies that maintain electric vehicles and equipment will need to source replacement electric motors from ARC Systems Inc. at some point in time. When industrial equipment breaks down, maintenance engineers must acquire items like gate elevator replacement motors, freight elevator replacement motors, and elevator replacement motors. Although these items may lack the excitement of speed boats, they still must perform quietly under demanding conditions.

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More Power From A Slender Motor

In the C-Pod, two electric motors drive counterrotating propellers that each produce 50 kw. Candela’s engineers selected this double motor approach because it solved problems related to power, cavitation, and heat.

The C-pod has a narrow torpedo shape. To compensate for the limitations that motor size placed upon torque, engineers increased the RPM. Power arises from torque multiplied by RPM. Therefore, a faster RPM allows the equation to yield more power.

Fast Boat Motors Aerate Water

A rapidly spinning propeller pushes air into the water around it. The air pockets undermine the propeller’s purpose of applying force efficiently and creating thrust. This problem is known as cavitation.

The cavitation issue inspired the engineers to design the motor with two small propellers that rotate in opposition to each other. This situation improves efficiency and supports the goal of producing a high RPM.

The propellers are mounted inline with one behind the other. Their opposing rotational directions negate the air pockets that are created by a single propeller. This allows the flow created by the second propeller to go straight and increase electric motor efficiency from 70% to 80%. Because efficiency adds to the operational range of an electric boat motor that relies on a battery charge, the double counterrotational propellers increased the range by 14%.

Water Cooling For A Hot Boat Motor

Having created such a powerful electric motor, Candela’s engineers needed to deal with the heat output of the motor. The submerged design of the C-Pod presented the solution to excess heat. The long and narrow shape of the motor exposed much of its surface area to water. Contact with water provides continual cooling while in operation. The below water positioning of the C-Pod gives it a distinct advantage over an electric outboard motor that cannot use water cooling.

Long Service Life

Engineers used two motors on two direct-drive shafts to power both propellers in the C-Pod. That design reduced linkage complications that accompany running two propellers simultaneously.

Overall, Candela’s engineers claim to have built an enormously efficient electric boat motor that could have an almost unlimited lifespan. The C-Pod has a maintenance interval of an impressive 3,000 hours, which amounts to a great deal of time spent on the water.

Electric motors like these also do not need oil changes as a gasoline or diesel-powered motor would need. As a result of its simplicity when compared to combustion fuel motors, the electric boat motor needs maintenance only rarely.

Electric motors can deliver even more advanced performance when combined with elegantly designed machines. In the case of speed boats from Candela, their hydrofoil hulls use 80% less energy to move compared to other boats. A C-Pod can accelerate the Candela 8.5-meter water taxi to 30 knots.

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