- I forgot the model number of the Sur Flo and it is too dark to go out there and see right now but any of them will work. This one was bought from anMessage 1 of 3 , Apr 12, 2005View SourceI forgot the model number of the Sur Flo and it is too dark to go
out there and see right now but any of them will work. This one was
bought from an agricultural supply place for about fifty bucks.
They use them to pump fertilizer and herbicide spray because they
have no metal parts in the pump itself so are corrosion proof. It
isn't that they are cheaper than a Jabsco, they will run dry without
self destructing, are self priming and last for years without
attention. There are other brands of electric diaphragm pumps that
are just as good. I removed the pump from the electric motor and
machined a flange to bolt the body of the pump to the output of the
camshaft of the Kubota and mated the shaft of the pump to the stub
end of the camshaft. Once you get everything apart it is apparent
what needs to be done. I believe that rubber impeller raw water
pumps were invented by people who were in the business of trying to
sell more marine engines. They are treacherous. I won't go all
into the details but I believe that more good engines have been
destroyed by rubber impeller pumps than by any other single thing.
The copper tubing is wrapped around every branch of the manifold
with the coils as close together as possible. There are three
separate, equal length tubes going around the three exhaust branches
of the three cylinders. The three tubes are connected in parallel
to hose barbs into which the water is pumped and out of which it
flows into the black iron exhaust pipe well downhill of the manifold
output flange. Don't use copper pipe directly in contact Diesel
exhaust as the sulphur dioxide in the condensed exhaust gasses eats
copper up very quickly. Iron is better.
Another aside: Kubota makes single cylinder water cooled Diesel
engines down to 4hp and 70 pounds. They run very quiet compared to
any air cooled Diesel engine. One way to hear one run is to stop on
the interstate alonside one of those flashing arrow signs that tells
you to change lanes. Most of those signs are powered by a little
Diesel engine running all the time. Yanmar makes small water
cooled engines, too, for industrial applications. I have a 20 hp
air cooled Italian Diesel engine on my sawmill and it is so loud
that I have to wear ear muffs to work the machine. Even a slow
speed Lister air cooled engine running a generator on a commercial
boat is very loud compared to most any water cooled rig. I would
have to give a listen before I committed myself to using an air
cooled Diesel as a propulsion engine on a boat.
One other thing: I joined this group to lurk around and find out
if there is anybody who has built or knows anybody who has built any
of the Atkin Seabright tunnel boats besides Alex Hadden and me.
I'll ask that question now. Thank you all for your consideration in
- Robb, I believe that rubber impeller raw water pumps were invented by people who were in the business of trying to sell more marine engines. They areMessage 2 of 3 , Apr 12, 2005View SourceRobb,
"I believe that rubber impeller raw water
pumps were invented by people who were in the business
of trying to sell more marine engines. They are
Amen to that! I grew up on boats with larger diesel
engines, operated several, owned several, all had raw
water pumps that required rubber impellers, replaced
them every 100 hrs, even if they didn't look bad. As
we know the rubber breaks down overtime, plus it
conforms to its surroundings, hence if it spins in one
direction all the time it will fold, bend, etc
opposite of the force, which creates a negative seal
between the impeller and the housing, resulting in
less suction. Which as an end result leads to burnt
out bearings in the pump, or in a worse case scenario,
an overheated cracked up engine. About time someone
came up with something better.
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- ... any ... in ... Greetings Mr. White, I m a big fan of your writing. I m also grateful to you for actually building one of these tunnel stern boats andMessage 3 of 3 , Aug 23, 2005View Source
> One other thing: I joined this group to lurk around and find outany
> if there is anybody who has built or knows anybody who has built
> of the Atkin Seabright tunnel boats besides Alex Hadden and me.in
> I'll ask that question now. Thank you all for your consideration
> this matter.Greetings Mr. White,
I'm a big fan of your writing. I'm also grateful to you for actually
building one of these tunnel stern boats and writing about the
I have not yet built one, but I plan to. (Just finished a Bolger
Light Schooner and the wife says I have to wait a few years before
building another!) To that end I have a couple questions for you.
First, would you mind providing a list of the mechanical parts that
went into Rescue Minor with sources and approximate costs? Inboard
power, particularly at 20hp, is a new to many of us in Outboard
Wonder Land (Wisconsin). I'd particularly love to know what reverse
gear you're using, source, cost, etc.
Now on to the hull. I'm trying to decide between Rescue Minor and
What's your take on the different chine sections? To me, the Rescue
Minor looks like the better sea boat, since Shoals Runner has a point
where the chine reverses, forming a straight-up flat-bottomed skiff
for that little bit. My light schooner has that hull form and gets
the hell beaten out of it by powerboat wakes. But maybe it doesn't
matter when it's such a small area?
I'd love to hear your thoughts on that. To put this in context, I'm
thinking about the steep chop of the great lakes and these wide,
shallow puddles we have all over up here. I guess that Normandy stern
might help there.
I'm somewhat inclined toward Shoals Runner, all other things being
equal, since it seems nobody's built one. It'd be nice to see how it
But total weight counts. I don't really want to mess with trailer
brakes, so I think that limits me to 3750# for boat and trailer in
Wisconsin. Might be 2000#.
I'm pretty sure your Rescue Minor weighs pretty close to Atkin's.
Anybody got a guess on the hull weights on these two designs?
If you read Duckworks you probably know I'll be writing about the
results of whatever I build. I just can't shut up, I guess.
Many thanks in advance, folks.