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.
Rick in Vancouver, Canada
----- Original Message -----
*From:* Peter Madsen <peter@submarines.dk>
*To:* personal_submersibles@psubs.org
*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 -----
*From:* ShellyDalg@aol.com
*To:* personal_submersibles@psubs.org
*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.
http://www.frappr.com/?a=viewphoto&id=1578526&pid=8678158&myphotos=1
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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