Is there a rule a thumb for sizing an auxiliary trolling outboard.

What size would be needed for a 30ft 10,000 lb boat?

On Wed, 06 Oct 2004 16:24:19 GMT, (Mike) wrote:



Is there a rule a thumb for sizing an auxiliary trolling outboard.

What size would be needed for a 30ft 10,000 lb boat?

Well, I had a 30 on a 32' Contender, but it's a waste of time. I
found that directional control was a problem and to tell the truth, I
could control the trolling speeds much better with one of the two main
engines off.

If you have any kind of draft on your boat, using the main engine(s)
would be much more efficient and you really aren't going to gain much
in the fuel department, never mind rigging a steering control system.

What kidn of boat are you trying to put this on?

Later,

Tom
-----------
"Angling may be said to be so
like the mathematics that it
can never be fully learnt..."

Izaak Walton "The Compleat Angler", 1653

On Wed, 06 Oct 2004 18:44:10 GMT, Short Wave Sportfishing
wrote:



Well, I had a 30 on a 32' Contender, but it's a waste of time. I
found that directional control was a problem and to tell the truth, I
could control the trolling speeds much better with one of the two main
engines off.

If you have any kind of draft on your boat, using the main engine(s)
would be much more efficient and you really aren't going to gain much
in the fuel department, never mind rigging a steering control system.

What kidn of boat are you trying to put this on?

Later,

Tom


I'm considering buying a Boston Whaler 305 Conquest however I looked
at the gas consumption (at boattest.com) at low rpm and I find it to
be quite high, that's why I was looking at a small aux trolling motor.

On Wed, 06 Oct 2004 12:00:47 -0700, Peter Guitzmyer
wrote:

On Wed, 06 Oct 2004 18:44:10 GMT, Short Wave Sportfishing
wrote:



Well, I had a 30 on a 32' Contender, but it's a waste of time. I
found that directional control was a problem and to tell the truth, I
could control the trolling speeds much better with one of the two main
engines off.

If you have any kind of draft on your boat, using the main engine(s)
would be much more efficient and you really aren't going to gain much
in the fuel department, never mind rigging a steering control system.

What kidn of boat are you trying to put this on?

I'm considering buying a Boston Whaler 305 Conquest however I looked
at the gas consumption (at boattest.com) at low rpm and I find it to
be quite high, that's why I was looking at a small aux trolling motor.

You mean the 295 Conquest?

At boatTEST.com, the low idle speed (Merc 225s EFI) Gph figure is 5.
That's not bad. Compared to cruise (25 Mph in the article) your fuel
flow is like 36 Gph (1.43 mpg x 25Mph). Just as a side note, I'm a
little suspicious of those article numbers based on my own experience
- they seem a little low.

Is it possible for you to change the engines over direct injected
engines?

On the other hand, mounting a kicker engine would be easy and
relatively uncomplicated. There are mounts made special for this
style of transom and you can go with different steering mechanism from
mechanical to hydraulic.

On the minus side, a boat with this much "wind sail" area will be hard
to control with a kicker engine. Just something to think about.

If you insist on a kicker, then 25 to 30 should be more can
acceptable.

Later,

Tom

On Wed, 06 Oct 2004 20:14:02 GMT, Short Wave Sportfishing
wrote:

your fuel
flow is like 36 Gph (1.43 mpg x 25Mph).

==========================

Tom, your math is backwards:

25 mph / 1.43 mpg = 17.48 gph

about right for 175 actual hp

On Wed, 06 Oct 2004 20:38:24 -0400, Wayne.B
wrote:

On Wed, 06 Oct 2004 20:14:02 GMT, Short Wave Sportfishing
wrote:

your fuel
flow is like 36 Gph (1.43 mpg x 25Mph).

==========================

Tom, your math is backwards:

25 mph / 1.43 mpg = 17.48 gph

about right for 175 actual hp

Dammit!!!

You know, mathematicians are horrible at arithmetic. :)

Thanks for the correction.

Take care.

Tom

"The beatings will stop when morale improves."
E. Teach, 1717

Is there a rule a thumb for sizing an auxiliary trolling outboard.

What size would be needed for a 30ft 10,000 lb boat?


none that you can buy will move that boat in anything other than a flat calm
and no current, except in Port Fantasy in LaLaLand.

JAXAshby wrote:
Is there a rule a thumb for sizing an auxiliary trolling outboard.

What size would be needed for a 30ft 10,000 lb boat?


none that you can buy will move that boat in anything other than a flat calm
and no current, except in Port Fantasy in LaLaLand.


Bull****. There are plenty of heavy 30 foot boats around with outboard
trolling motors that can move right along. Some of these boats have 20
or 25 hp outboards...I suspect most of them move on the outboards
faster than your crappy little sailboat.

--
"...vice president (Cheney), I'm surprised to hear him talk about
records. When he was one of 435 members of the United States House, he
was one of 10 to vote against Head Start, one of four to vote against
banning plastic weapons that can pass through metal detectors. He voted
against the Department of Education. He voted against funding for
Meals on Wheels for seniors. He voted against a holiday for Martin
Luther King. He voted against a resolution calling for the release of
Nelson Mandela in South Africa. It's amazing to hear him criticize
either my record or John Kerry's."

- Senator John Edwards, 10/05/04

electric?

hoary, trolling motors are those ****ant little electric things. Gas engines
aren't trolling motors -- even tho they may be used for trolling -- they are
gas motors.

remember hoary -- what you with your perfect score in you verbals SAT -- what
the phrase "trolling motor" means.

From: Harry Krause
Date: 10/6/2004 10:01 PM Eastern Daylight Time
Message-id:

JAXAshby wrote:
Is there a rule a thumb for sizing an auxiliary trolling outboard.

What size would be needed for a 30ft 10,000 lb boat?


none that you can buy will move that boat in anything other than a flat
calm
and no current, except in Port Fantasy in LaLaLand.


Bull****. There are plenty of heavy 30 foot boats around with outboard
trolling motors that can move right along. Some of these boats have 20
or 25 hp outboards...I suspect most of them move on the outboards
faster than your crappy little sailboat.

--
"...vice president (Cheney), I'm surprised to hear him talk about
records. When he was one of 435 members of the United States House, he
was one of 10 to vote against Head Start, one of four to vote against
banning plastic weapons that can pass through metal detectors. He voted
against the Department of Education. He voted against funding for
Meals on Wheels for seniors. He voted against a holiday for Martin
Luther King. He voted against a resolution calling for the release of
Nelson Mandela in South Africa. It's amazing to hear him criticize
either my record or John Kerry's."

- Senator John Edwards, 10/05/04

JAXAshby wrote:
electric?

hoary, trolling motors are those ****ant little electric things. Gas engines
aren't trolling motors -- even tho they may be used for trolling -- they are
gas motors.

Absurd. Trolling motors can be electric, or they can be gas outboards.
My Parker has an engine bracket with a built in mini bracket for an
outboard trolling motor. Many of the guys who troll seriously for
stripers in the Bay use outboards for trolling motors. Obviously, your
experiences are limited.

--
"...vice president (Cheney), I'm surprised to hear him talk about
records. When he was one of 435 members of the United States House, he
was one of 10 to vote against Head Start, one of four to vote against
banning plastic weapons that can pass through metal detectors. He voted
against the Department of Education. He voted against funding for
Meals on Wheels for seniors. He voted against a holiday for Martin
Luther King. He voted against a resolution calling for the release of
Nelson Mandela in South Africa. It's amazing to hear him criticize
either my record or John Kerry's."

- Senator John Edwards, 10/05/04