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'[EE] Stirling Engine - V twin Outboard motor'
2006\01\31@053324 by Russell McMahon

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Fishing with a Vee-Twin Alpha Stiling engine.
I so far haven't worked out WHY (although I can think of any number of
reasons) but it's a work of art.

______

Going fishing with a Vee Twin Alpha Stirling powered outboard. Two
Alpha Stirling engines mounted at 90 deg. to each other, sharing a
common vertical crankshaft. 340cc effective swept volume, 160watts
atmospheric, 1800 revs under load, 3100 revs free speed, engine 10kg,
total outboard 15kg, 350gm LPG / hour. ENG; Bore 70mm, Stroke 36mm
(hot cyls.), 30mm (cold cyls.)

   http://www.innerlodge.com/TechLine/Harry&ElaineDiers/

       http://www.innerlodge.com/TechLine/Harry&ElaineDiers/journal.htm

Power per sewpt volume is "low" by IC standards. Other measures of
goodness are more appropriate - who cares about the volume inside the
cylinders per se - in a production environment (which this certainly
isn't) it's the cost of doing it that matters, plus many other things.

2006\01\31@062032 by Michael Rigby-Jones

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{Quote hidden}

Very neat, having a virtualy 'infinte' cold sink must help efficiency a great deal.
I have to wonder if 160Watts is really sufficient to propel a boat with 4 people in under any condtions other than a mirror like surface with no breeze and certainly no currents.

Regards

Mike

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2006\01\31@071227 by Russell McMahon

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>>Going fishing with a Vee Twin Alpha Stirling powered outboard. Two
>>Alpha Stirling engines mounted at 90 deg. to each other, sharing a
>>common vertical crankshaft. 340cc effective swept volume, 160watts
>>atmospheric, 1800 revs under load, 3100 revs free speed, engine
>>10kg,
>>total outboard 15kg, 350gm LPG / hour. ENG; Bore 70mm, Stroke 36mm
>>(hot cyls.), 30mm (cold cyls.)
>>
>>    http://www.innerlodge.com/TechLine/Harry&ElaineDiers/

> Very neat, having a virtualy 'infinte' cold sink must help
> efficiency a great deal.
> I have to wonder if 160Watts is really sufficient to propel a boat
> with 4 people in under any condtions other than a mirror like
> surface with no breeze and certainly no currents.

It's smack in the range of electric trolling motors.
And probably about as quiet as an electric motor.

350 gm LPG/hour doesn't sound marvellous though.
That's about 1 kg/kWH.
As LPG ~~= 14 kWh/kg that's about 7% efficient end to end.
Bearable but poor.

Obviously "how much power is enough" is a very variable .
And how fast you go for X power and Y hull length also depends on many
factors.

Target top speeds for electric trolling motors appears to be about 5
mph.
FWIW 5 mph is enough to handle most ocean situations. (AFAIR "Half
Safe" - an ex US Army amphibious Jeep that swam the Atlantic and then
later much of the rest of the world, made under 5 mph tops. If you
have never read the story, track it down and read it NOW! :-)

But, I digress:  -

Google
           boat trolling electric volt amp motor
to enter a whole new world

Thrust per hull length and much more
12 feet / 30 lbf, 22 feet /  100 lbf - approx square law.

       http://www.outdoorcanada.ca/fish/control_power.shtml

12 v 40 Amp 40 pound thrust

       http://www.outdoorcanada.ca/gear/power_play4.shtml

FAQ of sorts. Interesting.

       http://www.minnkotamotors.com/support/faq.asp

This suggests that 360 W is a but slower than above

   http://www.electricboats.co.uk/boatype.html

Choosing the right trolling motor

       http://outdoorstore.espn.com/servlet/catalog.CFPage?hvarAID=espnsite&mode=article&objectID=29748

The electric trolling motor for the birding Jonboat

       http://www.birdwatching.com/tips/boat_birding/trolling%20motor.html


2006\01\31@072751 by Luis.Moreira

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Hi Russell,
This Stirling engine business seems very interesting. What I am trying
to find is info about theory of operation and easy to build engines with
no complicated machining. Do you recommend any sites?
Best regards
               Luis


Luis Moreira
luis.moreiraspamKILLspamjet.uk
tel. 01235464615
JET PSU Department
UKAEA Culham Division
J20/1/55, Culham Science Centre
Abingdon
Oxfordshire
OX14 3DB


{Original Message removed}

2006\01\31@074920 by Michael Rigby-Jones

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>-----Original Message-----
>From: .....piclist-bouncesKILLspamspam.....mit.edu [EraseMEpiclist-bouncesspam_OUTspamTakeThisOuTmit.edu]
>Sent: 31 January 2006 12:28
>To: Microcontroller discussion list - Public.
>Subject: RE: [EE] Stirling Engine - V twin Outboard motor
>
>
>Hi Russell,
>This Stirling engine business seems very interesting. What I
>am trying to find is info about theory of operation and easy
>to build engines with no complicated machining. Do you
>recommend any sites? Best regards
>                Luis

How about our very own Bob Blicks design? http://www.bobblick.com/techref/projects/stirling/stirling.html

They don't come much simpler than that!

Regards

Mike

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2006\01\31@091414 by Russell McMahon

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> This Stirling engine business seems very interesting. What I am trying
> to find is info about theory of operation and easy to build engines with
> no complicated machining. Do you recommend any sites?

There are a large number.
Michael mentoned Bob's "Prayer Engine" site, and Bob in turn mentions Koichi
Hirata's superb site

       http://www.bekkoame.ne.jp/~khirata/

which is the one I was going to refer you to as a starting point.
Once there, if you look at the bottom of the home page you find it is a
member of a web-ring and you can visit the other sites from there. There are
27 sites in the ring, covering many aspects of Stirling Engine design. One
of the most rewarding amateur areas is arguably "LDT" (low temperature
differential) Stirling engines. These aren't much good for anything
practical BUT will run on a cup of coffee or an ice cube and intrigue many
people. Googling on

       ltd "stirling engine"

will find many such devices. (46000 hits)



           RM


________

Just some of the sites on the web ring:
There's one LTD Stirling there (but not a simple one) and there are many
more via Google.
Bailey Craftsman Supply
Contains a variety of Stirling Engine Related Materials as well as Model
Metal Working Items.

Boyd's Tin Can Stirlings
Hot Air Stirling Engine Web Page. Build a Tin Can Stirling Engine. Free
Plans!!! New Computerized Stirling Engine! Tin Can Stirling "Hall of
Flames". How the Stirling Works Demo.....and MORE!

Luis Iturriaga's Model Engineering page
Site devoted to Model Engineering through 3D Computer Modeling mainly of
Steam and Stirling engines.

Dale Holt's Stirling Engines
Purchased and home-built Stirling engines. Other alternative energy items.

Moteurs a air chaud Stirling
comment construire un moteur avec des materiaux simples

The Little Engine Pages
A site devoted to Stirling and other Hot Air engines, model engineering in
general, and to showing other engine builders models. Be sure to visit our
companion site, http://www.stirlingsouth.com, which is also a member of this ring

Boehm Stirlingmotors
Boehm Stirlingmotors - Best quality for you! We have delivered over hundreds
of stirling motors recent years. Customers become enthusiastic about the
high quality. It's our passion to provide you with the best quality you can
get.

Laengle's Model Engine Home Page
A site with a variety of Stirling engines - from a simple to built engine up
to replica of Robert Stirling Engines.

Stirling South
The successor to The Little Engine Pages, but still devoted primarily to
Stirling and other hot air engines, with an occasional diversion to other
subjects.

Coffee Table Stirling Engines
Contains some animated computer models of Stirling engines and also a few
real stirling engines.

Build a soup can Stirling engine
Build a soup can Stirling engine Manual and kit of parts for sale. This is
an ideal first project for getting started in model engineering It requires
no specialist tools or skills.

Genoa Stirling
The designing and making of a Stirling cycle engine at the DICHEP, Faculty
of Engineering, University of Genoa ( Italy )

SNAPpro - Stirling Numerical Analysis Program
SNAPpro now simulates and optimizes free-piston and kinematic engines using
a built in genetic algorithm. Clearance and lip seals are now modeled. A
completely new GUI and vastly expanded graphing routines allow much easier
understanding of results on the fly. Sensitivity studies and optimizations
run an order of magnitude faster than on the previous version.

Stirling Engines and Energy Independence
Focused on Stirling Power Generation, Use of Sustainable fuels, and
engineering consultation in these areas.

Hobbies and Stirling engines
Mainly made for Stirling engines : models and explanation but also show my
others hobbies.

Development of a Selfstarting LTD Stirling Engine
Development of a selfstarting and twice double Acting Alpha-Type LTD
Stirling Engine for Use with Heatsources of Low to Medium Temperatures.
STMOT2: A Computer Programm for the Simulation of the Heat-Process and the
Dynamic of Alpha-Type Stirling Engines.

Hot Air Engines - Home Hobby Kits - E. Jones, Australia
A Website featuring Hot Air Engine Kits for the home hobbyist. All materials
and plans provided for easy installation and operation.

Heat Wave Stirling-powered wood stove fan
The Thermal Engine Corporation is the manufacturer of the Heat Wave Stirling
engine powered wood stove fan.

StirlingInfo.com - news, forum, organized directory
Stirling Cycle Engine Information. Current news, forum, well organized
directory of links, resources, and more!

Leif's Home Page
Personal home page about a hobby interest called model engineering. Mostly
Stirling, steam and internal combustion engines.

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2006\01\31@093500 by Luis.Moreira

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Thanks Russell, I will investigate...
                               
                                       Luis

Luis Moreira
luis.moreiraspamspam_OUTjet.uk
tel. 01235464615
JET PSU Department
UKAEA Culham Division
J20/1/55, Culham Science Centre
Abingdon
Oxfordshire
OX14 3DB


{Original Message removed}

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