Yamaha Outboards has announced their entry into the electric outboard boat market with the Harmo system. More than a bolt-on electric motor, the Harmo incorporates a tilting aluminum drive unit which can tilt up to 74 degrees to come all the way out of the water, an aluminum four-blade variable pitch impeller, the ability to steer to an amazing 170 degrees for maximum maneuverability, and Helm Master joystick controls.

yamaha harmo electric outboard system
The Yamaha Harmo electric outboard system integrates propulsion and control.

This is a rim-drive motor to maximize thrust, similar in concept to a bow thruster with the impeller completely surrounded by a ring. It creates 225 pounds of static thrust, or about the equivalent of a 9.9-horsepower outboard motor. Weight of the 3.7-kilowatt motor is about the same as an F25 outboard at 121 pounds, but of course, battery weight and choice will have a lot of bearing on just how much an entire power system weighs on any given boat. Battery choice will also dictate range and running time. Yamaha is saying that single engine applications can effectively control boats up to 21 feet in length, and twin-engine applications will top out at around 32 feet in length.

Like most electric outboards, this 48-volt package creates virtually no noise as it generates its power and boaters are likely to hear more wind and water noise than anything else. Its silent nature, along with the enhanced maneuverability and its environmentally-friendly nature, are expected to make the Harmo a top choice for boaters — especially on waterways where the use of internal combustion engines is limited. According to Yamaha the maneuverability is a particularly impressive strong point, with the ability to spin a boat in about its own length or (with twin-engine applications) move sideways.

harmo electric boat motor maneuverability
Awesome maneuverability is said to be a highlight of the Yamaha Harmo system.

Unlike other electric outboards (you can see our video review of one of the latest, the ePropulsion Spirit 1.0 Plus, in our Fishing and Gear Review Videos round-up), the Harmo visually appears more like a stern drive configuration than anything else at first glance. Don't let this fool you, however, as it can be mounted on a transom, motor bracket, or anywhere else an outboard motor can go. And unlike a stern drive, piercing the transom with a boot is entirely unnecessary.

The Harmo has been undergoing testing since last summer, and is now available in the European market. It’s expected to be available in the US within the next 18 months, but since the system is to be installed as a package on new boats as opposed to being sold directly to the consumer, Yamaha says the Harmo electric outboard system doesn’t carry MSRP pricing at this time.