You do not clutter up the list... Data you have supplied is very important to
us...
I agree that it is difficult to examine Electric motors power based on the lit
being provided by marketing corps...
Your reply (below) more than answers my question of whether 52lb thrust would
be adequate for lake or bay use... Your Compaq 19 at 2000# dry and 2500# wet
is a much heavier boat than a Potter 19 at 1300# dry and 1700# wet. I am
convinced that a 52lb thrust electric is adequater for local use excluding
windy and ocean conditions... Your message, quoted below, kind of confirms
it...
" Electric motors are very good for slow runs with minimal wind or current. I
use a 47 pound thrust motor on my Com-Pac 19 (2,500 lbs cruising
displacement) almost all the time. The exception is when the Mississippi
River currents get high during the spring floods or when I have to cover long
distances. Outside of those cases, I find the electric motor to be better
than a gas engine."
IMHO: the advantages of electric power are:
Non water polluting... They do not leave an oil line on the stern of the
boat...
Quiet...
Single handle FNR
I don't have to carry a fuel tank in the cockpit...
I would be using the electric for sailing in the lake one canal over and for
cruising the local canals... Not for reaching the inlet (3.5miles) or
exiting/entering the inlet... The only problem remaining is that if I don't
use the motor enough it will get arthereosclerosis and will require repeated
carb repairs...
Your contribution is appreciated.
Solar Fry
P19#1028, "Elusive"
Pompano Beach, FL
In a message dated 98-09-13 21:49:17 EDT, you write:
<< Subj: Re: Electric motor
Date: 98-09-13 21:49:17 EDT
From: onlinenow@stlnet.com (Jobst Vandrey)
To: SolarFry@aol.com
If you don't mind, I'll throw in two cents worth directly to you since I'm
not a Potter Owner and don't want to clutter up the list.
The old adage about 15 pounds of thrust being equivalent to 1 Horsepower
comes from advertising literature. Some manufacturers even put out electric
motors with 3 or 4HP in the name of the model. This eventually resulted in
a LOT of confusion.
Electric motors are very good for slow runs with minimal wind or current. I
use a 47 pound thrust motor on my Com-Pac 19 (2,500 lbs cruising
displacement) almost all the time. The exception is when the Mississippi
River currents get high during the spring floods or when I have to cover
long distances. Outside of those cases, I find the electric motor to be
better than a gas engine.
If you have the water line length and the cruising displacement (boat,
equipment, crew, and beer) you can easily calculate the amount of power
(electric or gas) you should have to reach a certain boat speed (under ideal
water tank conditions - no wind - no current). The formulas are on the
calculations page of my web site (http://home.stlnet.com/~onlinenow).
Regards
Jobst
-----Original Message-----
From: SolarFry@aol.com <SolarFry@aol.com>
To: hlg@pacbell.net <hlg@pacbell.net>
Cc: wwpotter@tscnet.com <wwpotter@tscnet.com>
Date: Sunday, September 13, 1998 7:51 PM
Subject: Re: Electric motor
>- - - - - - - - - - - - - - - - - - - - - - - - - - -
> West Wight Potter Website at URL
> http://www.lesbois.com/wwpotter/
>- - - - - - - - - - - - - - - - - - - - - - - - - - -
>Harry:
>
>Minn Kota motor are made for trolling while fishing not for continuous use.
>Larry Brown equates 18lb thrust with each HP. I do think you are right, one
>horse has more power than 18lbs... Nevertheless, I have used my model 65T
with
>35lb thrust for 3 yrs in salt/brackish water. I am going to try it on the
20'
>powerboat this week. Will let you all know how it works out. Theres a
1-2mph
>current in my canals as tide flows out.
>
>BTW: Minn kota rates them by boat weigh. A 52lb thrust (if I recall
>correctly) is good for trolling a 2500# boat.
>
>
>Best
>SF
>
>In a message dated 98-09-12 16:34:56 EDT, you write:
>
><< Subj: Re: Electric motor
> Date: 98-09-12 16:34:56 EDT
> From: hlg@pacbell.net (Gordon)
> To: wwpotter@tscnet.com
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> West Wight Potter Website at URL
> http://www.lesbois.com/wwpotter/
> - - - - - - - - - - - - - - - - - - - - - - - - - - -
> SolarFry wrote;
>
> >I currently use a Nissan "Orphan" 8hp to get my P19 in and out of the
>inlet...
> >I am seriously considering a Minn Kota Endura 52 lb [ 3.5hp ] thrust
($189
>at
> >Wmart) electric motor to propel my P19 around canals. IMHO: if my 3.3HP
> >Mariner can push the P19 in the canals and lakes then a 52lb thrust
electric
> >can do same.... The 3.5 is INCAPABLE of going out inlet to ocean against
> >current and wind... I am trying to sell the 95' 3.3HP Mariner for 400
>bucks..
>
> _________________________________________________________
> I don't think the 52-lb-thrust motor will be equivalent to a 3.5-hp
> outboard. I don't have specs on the Endura, but a 55-lb-thrust Minn-Kota
> uses 55 A at 12 V, which is 660 W, which is less than 1 hp input. You
can't
> get more power out than you're putting in. One hp = 746 watts, according
to
> my references. Am I missing something?
>
> I just found the following in my archives relative to a 52-lb-thrust
motor:
>
> "I am using an electric motor with 52# thrust on my Capri 14.2. In most
> conditions, this has been adequate for myself and one crew (total ~450#).
In
> heavy conditions, I have had difficulty pointing directly upwind, getting
> blown to either side. It is slow going but I have always made it to my
> desired destination. "
>
> The Capri should be easier to drive than a P19. Maybe use two trolling
>motors?
>
> Minn-Kota sells a Neptune 96, which is a pair of 48-lb-thrust Neptune 48s
> with a single controller. It uses 56 A at 24 V, which is about the same
> power requirement as my RT-72/S, which I compute at approx. 1.5 hp, but it
> might be more efficient with its two propellers. That might be a good
> choice for a P19 or Joel Holberg's Catalina 22. It's not specifically a
> saltwater motor like the Minn-Kota Riptide or the MotorGuide Great White
> series, so might not be suited for saltwater use unless carefully
> maintained.
>
> There are also 2.2 hp (24 V) and 3.5 hp (36 V) electric outboards that use
> an aircooled electric motor and a regular outboard drive. They are made by
> Ray Electric <http://www.rayeo.com/ >, but I think they are quite
> expensive. .
>
> Harry Gordon
> P14 #234, Manatee
> Mountain View, CA >>
> >>