T-Pain Is On A Boat: RE: [Electric Boats] Direct drive brushless DC motors now available

Friday, July 10, 2009

RE: [Electric Boats] Direct drive brushless DC motors now available

Arby, respectfully, you have been claiming literally for months now that
your new drive assembly was "available at Thunderstruck-EV". Again you
claim this, and again, while there are a half dozen different makes of
motors listed on that site, there's not a single web page I can find at
Thuderstruck substantiating they stock your motor/controller. There are no
text references, let alone photos, motor specs or motor curves for your
motor/controller. Now maybe they are available or maybe not---but to have
folks "call Mark" sounds more like you're asking us to build demand for
Thunderstruck to buy these from you, stock them and post them as
available---which they seem reluctant to do. As we still haven't seen
publicly available performance specs for your motor/controller, I'm
skeptical---and perhaps Thunderstruck is also. Please don't post to this
list that your hardware is available from a substantially website-based
company that hasn't even mentioned your hardware on their website.

Moderator NOTE to ALL: This is not a sounding board or focus group for
marketers, developers, thesis writers, etc. Attempts to use this list in
this manner leads to your list postings being moderated (including being
delayed, edited or deleted).

-Myles Twete, List Moderator, Portland, Or.

From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
On Behalf Of arbybernt
Sent: Friday, July 10, 2009 12:34 AM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Direct drive brushless DC motors now available

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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