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Fluidyne (and solar powered!) Engines

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Posted by Morris Dovey on April 5, 2009, 5:59 pm

For anyone interested in these things, I've just added photos of two
small fluidyne (liquid-piston Stirling cycle) engines built in France to


The first engine incorporates a working pump, and the second is
solar-powered using a parabolic reflector.

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by mpate on April 15, 2009, 12:47 am

Hi Morris:

Very cool, thanks for the update and the new page with videos.

I built the very small plastic one and will take some photos and send
them to you.

Do you know why the solar one didnt work?  It would be good to read
abou the issues that each of them had or suspect what worked and what
didnt so we can all progress in our knowledge and experiments.  Now
that the northern hemisphere is hitting spring we can all gear up
again and get going.


Posted by Morris Dovey on April 15, 2009, 3:05 am
 mpate@oscintl.com wrote:

Thank you - it's way too much fun not to share. The videos make it all
"come alive", but now I know that short, small-format videos do that
best. :)

I suspect that I'm going to need to find a video format converter and
re-sizing tool, and something that will let me trim and select scenes.
It takes me about ten minutes to download Simon's video (I've tried not
to think of what it must be like for anyone with a dial-up connection)
and I've been waiting for my ISP to squawk about all the bandwidth I'm
chewing up.

Yes! Please do - and please include measurements (including hot and cold
head temperatures, if possible) along with the photos so that others can
follow in your footsteps.

Also - please include permission to include your photos on the web site,
along with your name and location - I'd like to continue to provide
credits for everyone who contributes. If you're not too shy, send along
a photo of yourself - it's always good to be able to associate a face
with the work.

Entries will be added in the order that I receive photos/videos of
working machines - except that pride of place will go to whoever builds
the first solar-powered pump capable of 1000 (or more) gallons/hour.

I'm waiting for Simon's own conclusions, but since that engine worked
with heat applied from a torch (shown in his video) I suspect that the
reflector had too many ripples to focus enough radiation on the hot head.

There's a real need for development of a simple (preferably
non-electric, but electric will do for a start) mount/tracking system
for these these things. I'll be really happy to make another web page
for those if people send photos of what they have working!

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by Curbie on April 15, 2009, 4:09 am

Where's the link to the videos?

I think $9.00 (US) will un-lock any of their programs, which include
a video converter which I use, and a video editor, I use Pinnacle
Studio Plus, but have and have looked at AVS, and it looks fine.


Solar Tracker. I think $9.00 (US). Plus he got full schematics &
parts list for free.


Maybe something here will work?


Posted by Morris Dovey on April 15, 2009, 4:45 am
 Curbie wrote:


has (as of right now) two videos, and further down the page is a link to
Simon Popy's video (warning: LARGE file) showing his high-temperature
engine in preliminary testing. I've set it up so that you can watch the
small videos while the larger one is downloading.

Thanks! I'll take a look - and I should probably also wander over to
sourceforge to see if there's anything that looks good.

If you download Simon's video you'll understand where I'm coming from. :)

I'll probably order one of Duane's boards, but that's only one component
of what's needed - and his lead times have produced major discomforts
for his customers.

The ideal solution will something than can be built and maintained by
any farmer anywhere in the world who has a bit of mechanical ability.
It's a real design challenge...

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

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