T-Pain Is On A Boat: Re: [Electric Boats] Re: Repower for a Bristol 27

Saturday, December 24, 2011

Re: [Electric Boats] Re: Repower for a Bristol 27

I think you would be challenged to build up enough hydrogen to have a problem, but I have removed fuel from my bilge after a plastic fuel tank holed from vibration. Propane also will collect at low points.

Marine alternators have fine screens to arrest spreading flames, 0.050 openings if memory serves. The oily air deposits grime easily on the screens, reducing cooling. If you install the same, consider adding some forced air to increase flow and provide dry air.

Over-build, and run your system hard at the dock to locate weaknesses. It affords you the luxury of an easy shutdown without being out in the tide.

Be Well,

Arby

On Dec 24, 2011, at 5:02 AM, "John Green" <v_2jgree@operamail.com> wrote:

Hi,
WOW !!! Alarm bells ring in my head upon reading this.
First, what are gasoline fumes doing in the boat, that is, what are the
sources, and if there are significant sources, why is there no bilge
blower clearing them?
Propane fumes are possibly more justifiable, but again, perhaps there
should be a bilge blower?
There should be no loose hydrogen, it is simple to pipe a lightweight
gas up out of the location, which should perhaps be basically sealed.
I believe it was Arby who advised me some time ago re commercially
available accessories to do this, but I could be wrong.
I am setting up to use brushed DC motors. They will have the spark
sources covered to marine specs.
The gasoline generator once set up will not be below decks at any time,
nor will the backup outboard.
And the inside cooking will be done using alcohol, with a propane
barbeque outside on the pulpit rail.
I don't have loose gases in my house, I see no need for it to be a risk
in a boat.
At the same time, brushless might be better for other reasons.

Seasons Greetings to All,

John

3a. Re: Repower for a Bristol 27
Posted by: "Jim" jmills500@verizon.net jmills500@verizon.net
Date: Fri Dec 23, 2011 9:49 am ((PST))

Hi again!

So, for the Bristol 27, Tartan 27, and "plastic classics" like them, a
"drive" has to be selected. Here are some notes I made to myself that
were
plagiarized/copied/edited from various knowledgeable contributors.

Notes on AC Induction Motors (ACIM), Brushless DC Motors (Permananent
Magnet
AC motors (PMAC)), and Brushed DC Motors:

I don't consider brushed DC motors because they generate sparks from the
arcing between the brushes and the armature and this is not be
acceptable to
me near flammable materials (like gasoline fumes, propane fumes, and
hydrogen gas from the outgassing of unsealed lead-acid batteries).so
that
leaves me with the ACIM versus PMAC motor choice.

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