Thanks for asking for this info. It will affect my decision as well. John
On Tue, Jul 14, 2009 at 10:13 AM, leemurs72 <jt.yahoo@jtaylor.
>
>
> Hi Mr. Dej,
>
> In my case, I am waiting for hard numbers. Performance statistics of
> this motor installed in a boat. Testimonials are great but are best
> saved for late night television infomercials. Frankly, if this motor
> performs according to the claims, then I will be right there with cash
> in hand to convert my boat. But until I see actual in-the-field
> measured data, as well as bench-test data, then I am going to hold on to
> my money. It all comes down to that. People can make whatever claims
> they want, and others can pick apart those claims all they want. The
> only thing that stands on its own is data. And then only if it is
> produced by an independent 3rd party without a vested interest in
> selling the motors.
>
> For the time being, there seems to be some friction over how a 2kW motor
> can push a 4 ton boat into 30kt headwinds and 4' chop, against a 2kt
> tidal current. People with better brains than mine seem to be claiming
> that doing so takes more energy than the 2kW motor can deliver to the
> water. But all of this is conjecture since Arby has not provided any
> performance curves for his motor. The ball is clearly in his court on
> this matter. Numbers that interest me are:
> - amps vs. speed graphs for boats of varying mass, specifying prop size
> for each boat.
> - as above in different conditions of wind, wave and current.
> - Provide Google Earth tracks (.kmz files) from various runs in SF Bay
> (or any other suitable proving ground with known and verifiable
> conditions), indicating battery amp draw and prop shaft RPM at each data
> point. Truly interested parties could independently verify the bay
> conditions (wind, waves, current) using the timestamps in the KML file.
>
> Real-world and lab data will help me in forming my purchase decision.
> And the lack of real-world or lab data is in itself data that I will use
> in making my decision. I am sure that I am not alone. The (potential)
> customer must demand this information from any vendor. If the vendor
> _can't_ provide it, then they are no different than a garage tinkerer,
> assembling bits of electronics. If the vendor _won't _ provide it, one
> can only wonder how the after-sales support experience will be.
>
> Personally, I like the idea of a direct drive motor in a sealed unit
> that can take several minutes of immersion. I like this motor. I want
> it to work as claimed. But I barely have the money to do an electric
> conversion once, let alone twice in case I make a poor choice. So I am
> going to "wait and see" how this plays out.
>
> Cheers,
>
> /Jason
>
> --- In electricboats@
> "itsdej" <itsdej@...> wrote:
> >
> > Good Day to you "mtrgy" all in the group who have been involved in the
> bashing or dis belief of the aforementioned Advanced Marine 2K 24v $2500
> direct drive motor.
> >
> > My name is David Johnson. Some know me as the guy doing the
> documentary on the conversion of my 1979 30' Hunter 9,700 lb snailboat
> from Yanmar YSM12 diesel to full electric.
> > 4 months in the study of all of the available manufacturers of
> electric re-power options and I was most intrigued by the EV community
> myth that is the Arby Bernt designed motor.
> >
> > The maiden voyage was made by a 35 yr vet of the Florida Coast Guard.
> After 2 days of using the motor in every way one can imagine his final
> words were "How can I get one of these for my boat?"
> >
> > Even he was convinced by the power and efficiency of the motor based
> on delivery of needed "on demand" motion and simply keeping us out of
> danger (to include 30 mph head wind gusts, 5-7 ft swells, against an
> incoming St Johns current in a 50 yrd wide channel) as we zig zaged
> between a parade of ocean freight liners. Not such a good move, I know.
> Actually video coming soon.
> >
> > 2 months now and practically every week, sometimes a couples days
> given the time, we are out on the water with the flick of a switch. The
> ICW is very much like the SF Bay, conditions changing in the blink of an
> eye, not ever to our benefit. As some of you have seen on my "blatant
> commercial plug" website SILENTRUNNINGSYSTEM
> is a completely solid piece of marine compliant gear.
> > An attractive little box to boot.
> >
> > So without website marketing or online visual in-stock reassurance I
> am here to tell you, it is alive and it is kicking...and available.
> >
> > With all the advice and expertise Arby has shared on this group, and
> to many of you personally, there should be nothing but a resounding
> "Well alright! It's about time" or simple "Good for you Arby". While so
> many on here are spending weeks trying to get a treadmill motor to work
> under water, Arby has been taking all of the questions and postings and
> data into his garage and producing another option for you, yes YOU.
> >
> > You, the readers and group members are the ones that asked for this
> type of safe, affordable, and efficient motor. Arby had the know how to
> make it. How long ago did Shelley write the story of Dr Frankenstein?
> Jeeesh!
> >
> > Now go switch your boat on and enjoy the summer.
> > DEJ
> >
> >
> >
> >
> >
> > --- In electricboats@
> "mtrgy" sdmcmillan@ wrote:
> > >
> > > 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@
> "aweekdaysailor"
> <aweekdaysailor@
> > > >
> > > > 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@
> "Myles Twete" <matwete@>
> wrote:
> > > > >
> > > > > Arby, respectfully, you have been claiming literally for months
> now that
> > > > > your new drive assembly was "available at Thunderstruck-
> 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---
> haven't seen
> > > > > publicly available performance specs for your motor/controller,
> I'm
> > > > > skeptical---
> 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@
> [mailto: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-
> 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-
> > > > > Contact Mark in Sales during business hours.
> > > > >
> > > > > Be Well,
> > > > > Arby
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > [Non-text portions of this message have been removed]
> > > > >
> > > >
> > >
> >
>
>
>
[Non-text portions of this message have been removed]
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