ron @ fastlane sailing in san diego (http://www.fastlanesailing.com /) has a
hobie with a hard deck and power boat console mounted on top. they run
theirs with an outboard, but i don't know how big it is. you might contact
him for further details.
I've stashed the link for when I have an engine ready for the job. First
I need to get engine and tracking system worked out. The Hobie (spelling
corrected) will be a rental boat, so whatever I come up with will be
something I can assemble and set in place at the marina, then lift
off/disassemble when I'm done.
That'll give you a theoretical roughly 2HP. Enough to move it around,
but -not- with much speed. Think 'trolling motor'.
OTOH, if you can fit one concentrator/fluidyne, maybe you can get 2-3 of
'em on board. Now, you're approaching the capabilities of a 5HP outboard.
That should be enough to leave a wake -- at least a small one. <grin>
Two is a definite maybe - but from a practical standpoint, just one will
be an accomplishment, and a two-mile round trip on a calm, sunny day
should be enough to stir up a bit of interest. It might even be a good
thing to set a record that'd be easy for someone else to beat. :)
Here's a video showing a couple of very crude pipe oscillators being
driven with a small propane flame:
Would that be a 'solar-powered boat' record?
How about a _water-powered_ boat record? (*THAT* just might appeal to Guiness!
Or, if you *really* want to stir up interest, you find a way use something like
like carp, or catfish, for thermal mass. Then you lit it slip that the boat
is powered by a "fish/sun reactor" (best said when slurred a little). An
'inherently-safe, non-radioactive' device of your own design. Hang a pole
over the stern, and claim you've 'gone fission'.
If you're going to have fun with the idea, you may as well *REALLY* have fun
with it. <GRIN>
*LONG* time ago, there was a 'traveling science show' that went around to the
high schools. one of the things they brought was a bunch of cardboard tubes
(from mailing-tube size up to a 16' long, circa 8" ID, carpet roller). they
each had a section of metal screening in them a short distance in from one
end. Hold it carefully vertical over a high-output Bunsen burner, and let
the screen heat up, then remove it from the heat source. Fairly shortly
it would start to 'sing' -- louder, and louder, as it found it's "voice".
The carpet roller was -really- impressive; one might say profundo so. :)
Not necessarily. The control portion can be as tiny/simple/inexpensive
http://www.redrok.com/electron.htm#led3x (warning: large page!)
and small 12 VDC automotive motors with appropriate reduction gearing
driving lead screws should be adequate for positioning. I'd guess that a
marine/deep discharge battery should be enough for the test drive.
If life of device is spent around water, then steel, other than
galvanized, won't survive and brass is no good around salt water.
So it depends on how long is the install life before actually being
asked to perform task on how you approach the problem.
No problemo :o) We're sandbagging (again) in Iowa, but there's no danger
(yet) from salt water.
I'm hoping it won't take more than an hour to set up and worry over,
another hour for a two-mile round-trip, and then twenty minutes for
Here's the most probable test site (watch for wrap):
I should be able to recycle most of the materials.
Oops - I meant to point out (but forgot) that the tracking system's
primary job will be to accommodate the inertia of the collector - to
keep it in the same orientation while the boat moves under it. This
should provide minimal loading on the motors.
Tracking the apparent movement of the sun will, I think, be smallest
part of the job.
On Sat, 13 Mar 2010 01:45:55 -0600, the infamous Morris Dovey
How about air-loading some cylinders connected to the collector
system's (weighted) base to allow semi-free pivoting? It would
counteract the rocking motion of the boat to a great extent so
feedback from the position sensors would be diminished, lessening the
collector's "need to adjust" sensing. Are you using some sort of time
Perhaps the most valuable result of all education is the ability to
make yourself do the thing you have to do, when it ought to be done,
whether you like it or not; it is the first lesson that ought to be
learned; and however early a man's training begins, it is probably
the last lesson that he learns thoroughly.
-- Thomas H. Huxley
I like the idea, but am /really/ trying to avoid "scope creep" here. :)
There's another aspect - I plan on posting photos and videos of whatever
I end up with, and I don't want any of that to be easily adapted for
pickup truck mountable fire control or weapons platforms. :(
Duane Johnson's (redrok.com) little LED-based controller incorporates an
adjustable delay feature that I suspect will end up being tweaked
immediately before and during the voyage.
On Sat, 13 Mar 2010 12:36:47 -0600, the infamous Morris Dovey
No doubt _that_ has already been done six ways from Sunday. Don't
sweat it. People doing that would have lots of money to buy
sophisticated compensation units.
Yeah, prolly so.
I must study politics and war that my sons may have liberty to study
mathematics and philosophy. My sons ought to study mathematics and
philosophy, geography, natural history, naval architecture, navigation,
commerce, and agriculture, in order to give their children a right to
study painting, poetry, music, architecture, statuary, tapestry, and
-- John Adams
I'd prefer not to sweat it, but do. By way of explanation let me share a
short thread I saved (OP had a middle-eastern name and was posting via
Google Groups from the UK):
comp.lang.c - 2006 July 20-21
Subject: Center of Contour
<start of thread>
Could you please tell me what is the most efficient way of finding the
center of mass of the area enclosed by a closed contour.
I have a considerable circular region with streaks coming out of it in
either direction. Basically i want to find the center of the circular
region but it is getting offset due to the presence of connected
I am working with binary images only.
It's not really a difficult problem; but the answer would depend on what
you mean by "efficiency". Are you looking for the smallest code
footprint - or are you looking for fastest execution time?
I am working with a 120x160 binary edge image and by efficient I mean -
mostlly speed of execution.
I thought it might be an interesting exercise. Including some #defines
to parameterize the problem, the solution took fewer than 2 dozen
statements. It was compact _and_ fast.
Pleased with myself, I leaned back and thought about possible/probable
uses for the code...
...and then deleted the files.
Sometimes life just sucks.
<End of thread>
Interesting. I'm not sure which tracker you're going to use, but
there's a pretty wide choice.
My concern, again, would be the combination of speed and power
needed to orient the collector. IMHO, it would go up considerably
with requirements for accuracy. If a fairly wide range of "almost
OK" would be acceptable, then a slower actuator and less power
would be needed. When the Hobie bobs in a wave or turns sharply,
it's going to put one heck of a load on the actuators, I think.
BTW, if I was planning something that required tracking, I'd
consider an X-shaped baffle inside a coffee can with solar cells
located on each of the 4 corners where the X comes together.
Then, any pointing away from the sun would create more voltage on
one or two of the cells. Two relays- one for horizontal and one
for vertical movement could be used, with two coils per relay
moving a center contact. As one coil would get more power from
the solar cell, it would draw the contactor toward it and thus
make an electrical contact. With no light or with a balanced
"shadow," from the X-shaped baffle, the pull on either side of the
contactor would be equal, and thus no current to an actuator. I'm
sure that this has been done many times by others.
On Wed, 10 Mar 2010 16:01:09 -0500, the infamous Pat Barber
If you thought that was a sharp bow profile (which I feel is pretty
much standard for destroyers and other navy ships) check this out:
http://tinyurl.com/yeurjz6 The HSV-2 Swift, a 323-foot U.S. Navy
high-speed vessel with a real knife-edge bow and outriggers.
I wonder how much wood they burn in her boilers. (lame attempt to
bring it back on topic)
There is no such thing as limits to growth, because there are no limits
to the human capacity for intelligence, imagination, and wonder.
-- Ronald Reagan
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