Hi, there - When I lived aboard, I disliked the idea of having a gasoline
engine. For those of you who'd like to extend your surface time/range or
for battery charging while transiting, there are 6 hp diesel engines going for
around $400 to $500 (USD), 2 1/2 centimetre output shaft. Electric start,
too, with pull cord as backup. No more ka-boom.
They are out there.
----- Original Message -----
Sent: Wednesday, January 02, 2008 3:57
PM
Subject: [PSUBS-MAILIST] Outbord motor
solution.
Frank.
Believe or not - the outboard motor consept was used on UC1 FReya during
2003 and 2004. I used a 5 hk 2 stroke standard long legged outboard to propel
Freya out to sea when conditions permittet it. When on position the outborad
was taken inbord, and we dived. At 5 Hk she made some 3.5 to 4 knots.
The system suffered from three problems:
1. When i waves higher than 0.5 meters the motor would sometimes get so
high up that the propeller got into air, and sekonds later the entire outbord
would be submerged. Ultimately this ment that the system was oly function at
very nice conditions.
Solution: super long leg, better placement ( eg. a well in the aft part
of boat )
2. The engine could not be completely free of gasoline when sotored
onboad, causing problem with bad gasoline smell in the small confined space.
Solution: outside container / store on boat
3. People laughed and asked even more stupid questions.
Solution A: Give the Captian of the boat a Luger and some nine milimeter
ammo.
Solution B: Explain the consept.
With develupment its not an imposible approch. your boats speed will not
be much better with big engine, at 5 meters Freyas chritiacl hull speed was
about four knots, and that canot prectically be exceded. A light small engine
might be preffered.
Best regards,
Peter Madsen
----- Original Message -----
Sent: Wednesday, January 02, 2008 7:25
PM
Subject: Re: [PSUBS-MAILIST] Size of
pusbs.
I have taken a different approach to the surface propulsion problem
with my little sub project.
My initial design was to couple the sub with a surface craft like a
small pontoon section which would carry a compressor, generator, and
outboard motor to power the sub. Now I am adding a motor mount on the back
of the sub that can accept a small outboard like maybe 20 horsepower for
surface travel. When I get to the dive site, the small outboard will be
removed and stored on an accompanying motor boat while the sub goes
down, or possibly inside the sub. I have a sketch of the structure for the
rear ballast tank and motor mount on frappr. Here's the link to see what it
looks like.
I've got the parts for this in the shop and will start
fabrication as soon as I finish the hatch hinges and lock-down dogs. Hope to
get some pictures of that part up soon. ( Man!!! it takes a lot of grinding
to fab these parts.) Frank D.
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