Terminology aside -
Let me try to look at this another way - and if I'm missing a good option out there - please someone let me know...
Torqeedo 4R
~$3800, 48V, 189# Thrust
Torqeedo 2T (Tiller version - on Clearance currently at West Marine for $2200, typically closer to $3200)
~$2400, 24V, 115# Thrust
Minn-Kota Riptide 101
~$740(Cabela's), 36V, 101# Thrust
Minn-Kota Traxxis 80
~$570 (Cabela's), 24V, 80# Thrust
MotorGuide VariMax 75HT
$400 (Cabela's), 24V, 75# Thrust
**IFFF** The Traxxis 80 provides ~half the same power as the Torqeedo 4R, that might be enough to manage my boat.
There isn't a direct HP to pounds thrust conversion. From what I've seen on the internet (??), it sounds like 75# thrust might be equivalent to as little as 1HP - which seems low.
From: John Francis <surv69@gmail.com>
To: electricboats@yahoogroups.com
Sent: Wednesday, May 29, 2013 1:38 PM
Subject: Re: [Electric Boats] Trolling motors ==> electric outboards
In my opinion, anyone thinking electric should stop worrying about comparisons to IC engine horsepower.
As I see it, for the most part the comparison is ... well ... horsepoo.
The 10HP motor you use is not a ten HP motor, cause generally speaking, most sailors don't use a 10HP motor to generate 10 HP.
I kinda wonder if the only sailors, who've ever utilized 10HP from a 10HP motor, only did it to see "how fast", the engine could go, then they rev down.
Key ingredients for a motor on a sailboat is to provide steerage and some minimal degree of propulsion... not much more.
Of course it always helps to have a few hundred HP's and bowthrusters, if that's what you feel you need.
On Wed, May 29, 2013 at 11:08 AM, oak <oak_box@yahoo.com> wrote:
So, if one wanted to go with an "off-the-shelf" solution, there are trolling motors, and then there are the electric outboards.The electric outboards that I've see that are readily available include Parsun and the Torqeedos.The Torqeedo motors seem to run about $3K for a motor around ~6hp equivalent, and not much more to get 10hp equivalent.Is there a trolling motor out there that approaches 4HP? Is there anything in the $1500-$2000 price range that is readily available that would push a 20 foot boat comfortably, possibly on a 24V system?
From: stmbtwle <stmbtwle@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Wednesday, May 29, 2013 10:00 AM
Subject: Re: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
Well Minn Kotas have been around for quite some time, and it may be that the regulators weren't that cheap some years ago. Their more expensive motors do use PWM technology, and it may be simply that they're not motivated to go to the expense of redesigning the lower end of the line. There are only two "trolling motor" lines I know of, and it's my understanding they're now the same company. So you buy their product or you buy their product, or you paddle.
There are other motors, but considering their performance and price, it's comparing apples and artichokes.
--- In electricboats@yahoogroups.com, Kirk McLoren <kirkmcloren@...> wrote:
>
>
>
> Â When you look at how cheaply you can put a buck regulator together I wonder why they did that.
> Â
>
>
>
>
>
>
> ________________________________
> From: matt elder <mattelderca@...>
> To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
> Sent: Tuesday, May 28, 2013 4:30 AM
> Subject: Re: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
>
>
>
> Â
> The newer Minn Kota's with the selective 5 speed do indeed use a resistor pack.
> I have disconnected the resistors in my motors and I use a PWM golf cart controller for speed control.
> The resistors are potted into the front nose cone of the motor housing. Big coils of wire in epoxy with the metal nose of the motor as a heat sink. Very inefficient. The motors come apart easily and you can simply run better wires down directly onto the brush holders. Nice flexible 8 gauge silicone wire works great.
>
>
>
> Â
> mattelderca
>
>
> >________________________________
> > From: Arby bernt <arbybernt@...>
> >To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
> >Sent: Tuesday, May 28, 2013 12:44:07 AM
> >Subject: Re: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
> >
> >
> >
> >Â
> >Roger that Roger.
> >I've only taken one old one apart, and it had large power resistors which had fried the crimp terminals and the rest of the plastic.
> >New ones must be built better...
> >
> >
> >Arby
> >
> >
> >
> >________________________________
> > From: Roger L <rogerlov@...>
> >To: electricboats@yahoogroups.com
> >Sent: Monday, May 27, 2013 9:34 PM
> >Subject: Re: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
> >
> >
> >
> >Â
> >
> >Â
> >Just back from a fishing trip. AÂ lot of
> time was trolling with a $209 (new price) Minn Kota.
> >Â
> >Speed is selected on the handle as step changes
> from 1 thru 5. Progressing from 1 to 4 gives roughly linear increments
> in boat speed. Setting #5 makes a huge jump in boat speed from
> setting #4. At least twice the speed increase, maybe even more....I
> wonder what causes that? No, I don't know the how and what of their throttle
> control. It seems fairly efficient.
> >Â
> >A Resistor? Are you sure? That
> seems enormously inefficient, but maybe they are. Not that I know because
>  I've never taken one apart to check just how it was made. My
> assumption was that they were some combination of electrical switching along
> with activating a different number of windings.
> >Next step might be to get some VOM info and
> then look at an oscilloscope picture. The Minn Kota has 12 discrete cogging
> points per rotation. Â
> >Â Â Â Roger L.
> >....
> >............
> >Â
> >----- Original Message -----
> >From: Arby bernt
> >>To: electricboats@yahoogroups.com
> >>Sent: Monday, May 27, 2013 8:08 PM
> >>Subject: Re: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
> >>
> >>
> >>There are two kinds of trolling motors, resistor throttle and PWM (electronically switched). Resistor throttles are inexpensive and have poor efficiency at low speeds. PWM offers good efficiency over the range of operation. Both systems have similar efficiency at wide open throttle. PWM motors tend to be built better, as they serve a premium market. Salt water compatibility is another important issue, as metals designed for fresh water can corrode in the presence of salt water.
> >>My advice would be to troll garage sales for a substantial savings....
> >>
> >>
> >>Arby
> >>
> >>
> >>
> >>________________________________
> >> From: justaflsailor <sbl12@...>
> >>To: electricboats@yahoogroups.com
> >>Sent: Friday, May 24, 2013 2:20 PM
> >>Subject: [Electric Boats] Pushing a 16 ft fiberglass Whitehall
> >>
> >>
> >>
> >>Â
> >>I was curious if anybody has done this as to not reinvent the wheel.
> >>The oat is 16ft almost canoe/ kayak shaped. It weighs about 140
> lbs.
> >>I had thought about using a cut down trolling motor, but heard they
> were innefficient. If somebody has in their opinion the best set up, I would
> love to hear.
> >>
> >>
> >>
> >>
> >
> >
> >
> >
>
__._,_.___
| Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (19) |
.
__,_._,___
No comments:
Post a Comment