Now available at Thunderstruck-EV: The Advanced Marine Electric Propulsion 24v, 2kW, direct drive brushless DC motor specifically designed to replace inboard ICEs in sailboats up to 32 feet. With an internal controller, the motor unit is sealed to 10' of temporary submersion, yet vented to dry air to maintain atmospheric pressure within the motor housing, relieving seal pressure and eliminating grease migration. The 1" keyed stainless steel shaft extends eight inches from the motor rear face to accommodate hull curvature. The shaft exits five inches up from the bottom of the motor housing, and in the center of the 9.375" width. The motor housing is 13.75" tall, 3.25" thick, and weighs 30 lbs. Mounting is achieved via four 1/2 x 13tpi tapped heli-coiled blind holes, arranged symmetrically about the drive shaft on the sides of the housing. Simple mountings can be fabricated from 2"x2" aluminum angle, or with 1/4" aluminum plates secured to both the motor and engine stringers. Wiring does not require a relay or any external battery switch. Battery leads are designed to be connected directly to the main battery. A second string can be combined with the primary string using a two position switch. Logic power is controlled by a remote switch, and consumes a mere 40mA on standby (50mA with an LED power indicator). When the logic power is off, there is no measurable battery drain. There are no exposed terminals, no additional connectors, and no external wires between the motor and the controller. With a no-load speed of 1000rpm, the motor achieves peak output at 875rpm, making the use of large efficient propellers possible. Although an aggressive prop will provide peak performance, the motor torque range is broad and efficient, making nearly any prop functional without modifying the boat. I'm currently fitting a Ericson 27 (6800lb displacement) with an Advanced Marine motor and an 11x11 3bl prop, having met success with both a 30' Hunter (9700lbs, 12x7 2bl prop) in St. Augustine, Fl, and a 30' custom sailboat (~8000lb, 12x8? 2bl prop) in Marshall, Ca. Both boats have been providing reliable service, and cruise comfortably on 24v at 40 to 60 amps. I hope to splash the Ericson this weekend, and will be conducting testing next week, pending an unpredictable travel schedule, in the challenging conditions of San Francisco Bay. I'll post pictures and stats when the installation is complete. Energy will be provided by two sets of 2x12v, North Star NSB100FT 100aH AGMs, located within the existing motor compartment. Cooling is provided by a shaft mounted fan, directing air across the rear of the motor housing. Motor control is achieved with two encapsulated switches (logic power and prop direction) and a mil-spec wash-down grade potentiometer for throttle level, all provided. An optional ParSun throttle interface can be pre-wired to the motor. Control wiring is plug-and-play with the ParSun, or with just three 1/2" mounting holes for the included switches and potentiometer. The switches and pot can be mounted in any exposed area, but I would recommend keeping the ParSun covered when not in use to slow aging of exposed rubber cables.
I invite your questions and comments. This design is constructed provide many, many years of reliable service, with the fastest wearing part, a double row sealed bearing (3305) resolving the prop shaft thrust, replaceable without disturbing the installed motor. The standard warranty is five years, full replacement, excluding over-voltage (<30vdc), reverse polarity, and shipping. Rebuilding damaged motors can be accomplished by returning the motor in the original shipping container. I am offering an unlimited lifetime warranty with the a-fore mentioned conditions on the first ten units, five of which are now ready to ship from Thunderstruck-EV. Contact Mark in Sales during business hours.
Be Well,
Arby
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