What is really unfortunate is that such a blatant commercial plug and one so full of BS is posted here.
There is no way a 2KW motor is going to provide good results in boats up to 32'. It is even less possible that it will provide good performance with the varied array of boats and propellers quoted. Will it move these boats? of course. Will it meet the expectations of most sailors? Not likely.
These kinds of posts do nothing to advance the cause of electric propulsion and should be ignored and removed from this site.
Scott.
--- In electricboats@
>
> To be fair, both of Arby's prior references were future tense - so yeah he was late, but that hardly constitutes deception. He's contributed meaningfully to the group, has an apparent wealth of knowledge and has a product that will likely prove useful to at least some members of the list.
>
> That TS hasn't updated their site is also not surprising. They are probably busy with yet-another motorcycle that can tear it's own tires off.
>
> But...healthy skepticism is warranted, and I would be extremely interested in some actual speed/watt and efficiency graphs. One marketing challenge is that the alleged increase in efficiency will only be obvious in actual installations - it's unlikely the motor itself will show more than a few percentage either way. It's the removal of drivetrain loss factors (belts, chains, bearings) that should make the most difference.
>
> -Keith
>
> --- In electricboats@
> >
> > Arby, respectfully, you have been claiming literally for months now that
> > your new drive assembly was "available at Thunderstruck-
> > 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---
> > publicly available performance specs for your motor/controller, I'm
> > skeptical---
> > 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@
> > On Behalf Of arbybernt
> > Sent: Friday, July 10, 2009 12:34 AM
> > To: electricboats@
> > Subject: [Electric Boats] Direct drive brushless DC motors now available
> >
> >
> >
> >
> >
> >
> >
> >
> > Now available at Thunderstruck-
> > 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-
> > Contact Mark in Sales during business hours.
> >
> > Be Well,
> > Arby
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
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