I'm now working with the shipyard and engineers who are doing the final
design and engineering for this vessel:

http://home.maine.rr.com/rlma/UMDconcept.htm

The electrical subcontractors were at the last meeting and I asked them
about using AGM batteries in the boat. They said they wouldn't consider
using anything else. I said, "Safety?"

They said, "No, better performance. The safety is just icing on the cake."

These guys not only design the electrical systems for very sophisticated
vessels but things like remote telephone switching stations and computer
server sites. A lot of the systems they design run unattended and a
battery explosion could create damages up into the seven figure range.

I'm sure that, if you like tinkering with batteries the way Larry does, wet
cells make sense as a hobby in themselves. There also may be some
advantages for boat spending long periods in remote parts of the world. For
most of us though, this is the most knowledgable vote I've heard yet for
using AGM's.

--
Roger Long

On Jul 29, 3:55 am, "Roger Long" wrote:
I'm now working with the shipyard and engineers who are doing the final
design and engineering for this vessel:
Roger Long

Hi Roger:

I was wondering why you put the exhaust/funnels so far aft? Seems like
having them attached to the house would give better aft visiability
for the skipper and alow for easier loading deck loads at the dock or
at sea transfers with a crane.

Just wondering?

Bob

"Roger Long" wrote in message
...
I'm now working with the shipyard and engineers who are doing the
final design and engineering for this vessel:

http://home.maine.rr.com/rlma/UMDconcept.htm

The electrical subcontractors were at the last meeting and I asked
them about using AGM batteries in the boat. They said they wouldn't
consider using anything else. I said, "Safety?"

They said, "No, better performance. The safety is just icing on the
cake."

These guys not only design the electrical systems for very
sophisticated vessels but things like remote telephone switching
stations and computer server sites. A lot of the systems they design
run unattended and a battery explosion could create damages up into
the seven figure range.

I'm sure that, if you like tinkering with batteries the way Larry
does, wet cells make sense as a hobby in themselves. There also may
be some advantages for boat spending long periods in remote parts of
the world. For most of us though, this is the most knowledgable vote
I've heard yet for using AGM's.

--
Roger Long


http://home.maine.rr.com/rlma/D-137-3.pdf -------- This shows . . .

a really stupid interior design. The entire accommodation is
ill-conceived and obviously designed by a lubber. Why put the berths way
forward for the roughest ride possible? Duh! Move the berths aft as far
as you can get them in the accommodation. Put the heads up forward.

Wilbur Hubbard

"Bob" wrote in message
oups.com...
On Jul 29, 3:55 am, "Roger Long" wrote:
I'm now working with the shipyard and engineers who are doing the
final
design and engineering for this vessel:
Roger Long

Hi Roger:

I was wondering why you put the exhaust/funnels so far aft? Seems like
having them attached to the house would give better aft visiability
for the skipper and alow for easier loading deck loads at the dock or
at sea transfers with a crane.

Just wondering?

Bob


Everything about the boat screams "amateur, lubberly effort." It looks
like a toy designer drew the thing. Is it going to be built in Japan at
the Tonka factory?

Wilbur Hubbard

....
Everything about the boat screams "amateur, lubberly effort." It looks
like a toy designer drew the thing. Is it going to be built in Japan at
the Tonka factory?...

Really? With the limited plans on hand it looks like a shallow,
fairly fast day boat for science work in protected waters to me...
Boats are built to specific services. They shouldn't all look alike.
To me, the most curious bit of this design is the keel arrangement.

FWIW, I've been happy with my Lifeline (tm) AGMs, too.

-- Tom.

wrote in message
oups.com...
...
Everything about the boat screams "amateur, lubberly effort." It
looks
like a toy designer drew the thing. Is it going to be built in Japan
at
the Tonka factory?...

Really? With the limited plans on hand it looks like a shallow,
fairly fast day boat for science work in protected waters to me...
Boats are built to specific services. They shouldn't all look alike.
To me, the most curious bit of this design is the keel arrangement.

FWIW, I've been happy with my Lifeline (tm) AGMs, too.

-- Tom.


Since when does a "dayboat" need berths? You know as well as I do that
the boat can and will stay out for more than a day.

AGM batteries are good but they are overpriced by at least 4X. You
could put together a lithium ion bank for the same price that would last
longer, hold more charge and charge more quickly . . .

Wilbur Hubbard

... You know as well as I do that
the boat can and will stay out for more than a day.

It's a planning boat with jet drives. You think it's going to cross
oceans?

....
AGM batteries are good but they are overpriced by at least 4X. You
could put together a lithium ion bank for the same price that would last
longer, hold more charge and charge more quickly . . .

AGMs are about $2/AH at 12 volts. I don't think you can get lithium
ion for anything close to that. I've recently paid about an order of
magnitude more on an amp hour basis for computer batteries at deep
discount. Lithium ion batteries are tricky to charge and a fire
hazard if not very carefully controlled, but if the price were
competitive lots of folks would be using them...

-- Tom.

Sheesh. I forgot that I hadn't killfiled this nitwit on my home computer
yet.

--
Roger Long

"Wilbur Hubbard" wrote

a really stupid interior design. The entire accommodation is ill-conceived
and obviously designed by a lubber. Why put the berths way forward for the
roughest ride possible?

Because the berths are infrequently used and generally in port or while on
station (moving slowly and just maintaing position). The heads on the other
hand, are used constantly.

--
Roger Long

"Bob" wrote

I was wondering why you put the exhaust/funnels so far aft?

Look at the separate gear handling areas, one for gear that needs to go over
the side and one for gear that goes over the stern and I think you'll start
to get the idea. These boats also need windage aft to help maintain
attitude on station and the windage of those two stacks aft will help a lot.

The most critical operator view is of the wire that goes over the side
A-frame attached to perhaps a quarter million dollars worth of insturments.
That's why no uptake and stack between pilothouse and side gear handling
area.

--
Roger Long