Electric Propulsion For Yachts

Many yachts in the 25 to 35 foot range are used on sheltered waterways and hardly clock up any engine hours. The motor is mainly being used for a short time at the beginning and end of each trip. Small inboard diesels have well known downsides in this context. Short operating periods and long periods of neglect are bad for these engines.

Faced with replacing the inboard motor on his Catalina 27, American sailor and electrical engineer Scott McMillan installed a self built electrical propulsion system. Impressed with the performance he decided to develop the Electric Yacht System as a commercial enterprise.

Looking at the information on the Electric Yacht System website it certainly seems that this is a viable option for small yachts where the type of use and location are suitable. It appears that there would be some weight and cost saving gains over a replacement inboard engine. However, the savings in fuel and servicing costs would largely be negated by the periodic replacement of the batteries. On the other hand the batteries can be recharged by a wind generator, or solar panels for boats on moorings. This makes it a good environmental choice not to mention the peace and quiet when in use.

Certainly an electric engine has other advantages.

• There is no requirement to store fuel and oils thus eliminating smell, fumes and fire hazards
• Though still requiring the stern gland for the prop shaft, the engine water intake and exhaust can be eliminated, reducing the number of skin fittings by two