James -- thanks much for this. Since Kelly sells motor/controller combinations on their web site, I wonder if Doug's issue is really a mismatch? The controllers are programmable, so the question is, is the motor/controller pair not matched, or was the controller programmed wrong at the factory, or is there a programming change he can make now to eliminate the noise, or is the motor itself noisy?
I really wonder before I pull the trigger on a $1000 motor/controller combo that looks exactly like Doug's.
Doug, what do you think? And anyone else have noisy motor problems? -- Paul
--- In electricboats@yahoogroups.com, James Lambden <james@...> wrote:
>
> Paul,
>
> If a controller is not characterized properly for a motor, then the
> motor will be noisy.
>
> The motor acts very similarly to a speaker. For instance, on
> electric model planes, when you first start the plane, the controller
> can make the motor sing a tune!
>
> A good sign of a properly programmed controller is a silent motor.
>
> James
>
>
>
>
>
>
>
>
> On Nov 7, 2010, at 10:06 AM, tartan27hull157 wrote:
>
> > Hi Doug, thanks for the notes. After I posted I noticed that the
> > title of your photo is "gearbox installation" so I should have
> > figured that out. As for the noise issue, that was what I was
> > really interested in, you think it was the PMAC itself? Not the
> > controller (I have heard that they generate a high-frequency whine,
> > though it's supposed to be out of human hearing range?), or the
> > gearbox?
> >
> > Silence is a strong motivation for me so I balk a little at any
> > noise issue.
> >
> > I did like the Cycle Analyst, building an enclosure I this is a
> > good trade-off since you can find the best place it with minimum
> > new holes and such. I assume you like to see it from the helm?
> >
> > Did you get the Mars 3001/KBL48301 combo from Kelly?
> >
> > Thanks, Paul
> >
> > --- In electricboats@yahoogroups.com, "Doug" <dj2210@> wrote:
> > >
> > > Hey Paul
> > > I do have a 2:1 gear reducer and it reverses rotation but that
> > worked out great for the Mars PMAC. The mount is aluminum and made
> > up of 2 pieces of angle and U channel bolted together.
> > > I also was planning on doing a belt/pulley reducer and still
> > might just to see the difference. The advantage of the that is
> > easier to change reduction ratio and the (for my install) placing
> > the motor closer to the aft of the boat allowing for more space in
> > my engine compartment. I can just fit 2 group 31 batteries between
> > motor and compartment door. The other 2 batteries go where the fuel
> > tank was.
> > > Yup i did my conversion in the water but the bottom needs redoing
> > so maybe I'll change the prop when that happens next year.
> > > Every thing takes more time than anticipated. I thought I would
> > have had this done last month.
> > > P.S. I really like the large Cycle Analyst although you do have
> > to provide your owe enclosure.
> > > P.P.S. Did I mention that the Mars PMAC is noisy?
> > > Doug
> > >
> > > --- In electricboats@yahoogroups.com, "tartan27hull157"
> > <tartan27hull157@> wrote:
> > > >
> > > > Doug -- thanks much! This is very similar to what I am thinking
> > of putting in my T27, the pictures are a great help!
> > > >
> > > > I can't quite see, is there reduction? From the angle of the
> > motor it looks like it is bolted directly to what looks like a sort
> > of bellhousing integrated with the pillow block...so, is it direct-
> > drive? Or perhaps there are gears or a belt I can't see.
> > > >
> > > > I have a longer shaft alley, so my plan was to put the motor
> > aft of the forward end of the prop shaft (above the prop shaft).
> > The prop shaft and drive shaft would penetrate a plate which
> > supports both the thrust bearing (below) and the motor (above),
> > with a toothed belt running about 2:1 between them. Like you, I was
> > going to mount this whole "sled" on rubber engine mounts, though I
> > wasn't sure how much need there would be for dampening. My A4
> > didn't seem to vibrate much, and I have the shaft out to get it
> > checked by a prop shop...I may replace it, as well as the prop
> > (obviously, I am out of the water...if memory serves, you did your
> > conversion in the water?).
> > > >
> > > > Anyway, thanks again for the detailed info and appreciate any
> > thoughts you have on the design of the mounts. I looked into "drop-
> > in" replacements and even helped another guy in the yard "drop in"
> > his SolidNav Explorer...it didn't exactly "drop in," so I am still
> > pretty interested in fabricating a solution specific to the space
> > available.
> > > >
> > > > Take care and happy sailing, Paul
> > > >
> > > > --- In electricboats@yahoogroups.com, "Doug" <dj2210@> wrote:
> > > > >
> > > > > Thanks and yes I have 4 rubber mounts which you should be
> > able to see under my photos. I didn't spend too much time in the
> > alignment stages just made it connect to the coupler. My atomic
> > four also had a vibration (although not as bad) so I'm wondering if
> > the prop shaft is bent or not balanced.
> > > > >
> > > > > --- In electricboats@yahoogroups.com, tartan27hull157@ wrote:
> > > > > >
> > > > > > Doug-congrats on your first e-sail! Curious about your
> > vibration issue. Do you have any dampening installed? I am looking
> > at the same motor/controller combo and am trying to figure out best
> > way to mount it.
> > > > > > Sent via BlackBerry from T-Mobile
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: "Doug" <dj2210@>
> > > > > > Sender: electricboats@yahoogroups.com
> > > > > > Date: Sun, 07 Nov 2010 02:17:24
> > > > > > To: <electricboats@yahoogroups.com>
> > > > > > Reply-To: electricboats@yahoogroups.com
> > > > > > Subject: [Electric Boats] Catalina Conversion First Try
> > > > > >
> > > > > > Installed the Cycle Analyst this afternoon and since the
> > wind was up decided I needed to sail. This is the first time that
> > I've had a chance to try out what I spent time and money on. This
> > is what I observed with my iPhone gps 5.4mph(4.6knts) @70amps.
> > 50amps produced 4.5 mph. Battery consumption for the time the motor
> > was on used 22ah.
> > > > > > The controller (Kelly) temperature was slightly warm and
> > the motor (Mars PMAC) was very warm. I didn't have a temp gauge but
> > I could put my hand on the motor for a few seconds until I needed
> > to let go.
> > > > > > I do have some issues with vibration which I'll have to
> > correct and it is louder than I expected producing a loud whine.
> > > > > > Whats nice is just flipping a switch to run it- no water,
> > fuel or smell.
> > > > > > Doug
> > > > > >
> > > > > >
> > > > > >
> > > > > > ------------------------------------
> > > > > >
> > > > > > Yahoo! Groups Links
> > > > > >
> > > > >
> > > >
> > >
> >
> >
>
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