[757labs] New Project Idea - Mini Wave Glider
757labs at oneross.com
Mon Oct 17 15:57:57 EDT 2011
Steve: Sorry, didn't really know what phrase to use, I was trying to say
"hunk of metal moving back and forth between coils to generate electricity".
The weighted fin idea is what I was heading towards with the 'Salter's
Duck" thing (Salter was a guy who wanted to use big honking weighted fins to
do what you described to described during the oil crisis in the '70s).
Trevor: I'm not too sure on the physics, but I think the forward motion
relies on the rising float pulling up on the submerged platform, forcing
water down across the vanes and towards the back... If you have too much
play with a flywheel you'll loose most of your ability to move forward.
Same basic concept as the linear generator (up/down motion of tether =>
voltage/current) but better communicated and probably more efficient. I
think that'd just leave either finding the right amount of tether movement
to still generate forward motion while creating useful amount of electrical
power, or some way of switching between a fixed tether for moving and a
moving tether for power generation.
http://www.icrepq.com/icrepq-08/380-leao.pdf has a bunch of different
wave-power conversion technologies that might inspire something useful (but
if we trailed pelamis tentacles it might look like a sea creature and get
Also, I just took a second look at the WaveGlider pdf and noticed the vanes
switch position on the upward and downward motion, which I'd missed before.
Does anyone know if they just do that naturally because of their shape or
if they're actuated somehow?
On Mon, Oct 17, 2011 at 2:25 PM, Trevor Lewis <trevorl.salad at gmail.com>wrote:
> I'm not familiar with Salter's ducks, but according to good 'ol wikipedia
> (and correct me if I'm wrong, I just did a quick skim) it generates power
> based on the impact of a wave. It looks like the glider uses the rise and
> fall of the wave to pull the float forward. Wouldn't a simple
> dynamo/flywheel combination be an easier way to generate power? The
> upward rise of the wave extends the tether, causing the flywheel to spin,
> and generating current. The downard fall of the wave retracts the tether,
> resetting the system. I think we would end up generating more power than we
> could reasonably use, even in relatively calm seas.
> On Mon, Oct 17, 2011 at 1:17 PM, Michael Ross <757labs at oneross.com> wrote:
>> It might be possible to generate electrical power from wave motion when
>> reserves get low (maybe dual-purpose the blades on the underwater platform
>> to act as Salter's Ducks for a few hours on cloudy days with high seas, or
>> maybe just a simple plunger core linear generator). It would increase
>> complexity (and probably be some pretty tough engineering to have veins that
>> would operate efficiently in both mechanical-locomotion/steerage mode and
>> Salter-Duck mode) but provide a second source of electrical power.
>> On Mon, Oct 17, 2011 at 12:42 PM, Trevor Lewis <trevorl.salad at gmail.com>wrote:
>>> That is a damn cool project. Really graceful design. I wonder if it would
>>> be possible to print all the components for a 1/4 scale version of the
>>> glider, that would certainly make it affordable. At smaller scales the
>>> design might have to be tweaked to increase its odds of survival in heavy
>>> At 1/4 scale the float is 52x15cm, the glider is 10x47.75cm and the wings
>>> are 26.75cm. Still actually a pretty respectable size.
>>> Of course a scale version will also reduce the surface area for the solar
>>> panels. Think there would be enough juice to power an APRS system, GPS, and
>>> brain? I would love to be able to fit an acoustic recorder in the system,
>>> bet we could get some interesting stuff.
>>> On Sat, Oct 15, 2011 at 7:52 PM, Almost_There at COX.Net <
>>> Almost_There at cox.net> wrote:
>>>> 757 Labs - Mini Wave Glider;
>>>> We should make a Mini Wave Glider; a scaled down version of Liquid
>>>> Robotics Autonomous Wave Glider (there's is roughly surfboard size, we
>>>> should make one 1/4 to 1/2 that size.) Simply put, it converts the up/down
>>>> motion of waves to forward thrust (free locomotion.) Liquid Robotics has
>>>> demonstrated long duration missions of over 2500 miles and over 400 days
>>>> without any intervention. We could start small and work our way up, but
>>>> ultimately have it autonomously cruse up & down the east coast (or if we're
>>>> really brave, cross the Atlantic.)
>>>> * Solar power recharges batteries
>>>> * Guided by GPS
>>>> * Reports location and sensor data by APRS
>>>> http://LiquidR.com/ <http://liquidr.com/>
>>>> (You can copy patents, as long as you don't profit from it i.e. free for
>>>> personal use.)
>>>> 757labs mailing list
>>>> 757labs at 757labs.org
>>>> If we knew what we were doing it wouldn't be research.
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>>> If we knew what we were doing it wouldn't be research.
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