Stirling Engine

[BOB BLACKSHAW 1Participant @bobblackshaw1]

Hello,

I have found the plans for this Stirling engine on the net but four pre made parts are not shown, 16, 21, 25, 45, has anyone got the sizes of these parts. I think that a guess to the size would be good enough, but on these type of engines is the hot piston any different to the cold piston in diameter

Thanks for any replies.

[BOB BLACKSHAW 1Participant @bobblackshaw1]

GRIZZLY H8101

[Ian S CParticipant @iansc]

Hi Bob, could you give some indication of what these parts might be? I imagine the motor is a Gama type, with parallel hot and cold cylinders, if so and the cylinders are the same bore, the displacer stroke is made longer, or if the stroke is the same, the bore is increased. Which ever way the ratio between the two is 1.5 :1.

Ian S C

[Michael GilliganParticipant @michaelgilligan61133]

Ian,

This appears to be the beast in question:

**LINK**

and the Owner's Manual

MichaelG.

 

Edited By Michael Gilligan on 14/02/2016 10:22:48

[Michael GilliganParticipant @michaelgilligan61133]

As an aside, for the amusement of grammar/punctuation enthusiasts:

[quote]

Note: Some parts have been pre-machined at the factory and are identified as such below. Also, there are some common fasteners and a wood base that are not required but are included with this kit.

[steamdaveParticipant @steamdave]

This style of Stirling engine has seen several variations on the theme.

For a set of plans and a few notes have a look at
http://www.homemodelenginemachinist.com/showthread.php?t=8937&highlight=stirling

Dave
The Emerald Isle

 

Edited By steamdave on 14/02/2016 11:23:25

[Ian S CParticipant @iansc]

Thanks Michael, I'v just come off the Grizzly web site. #16 is the power piston, it is brass 13 mmD x22 mmL this gives you enough to grab it in the lathe chuck. #21 is the displacer cylinder, this should be about 2 mm greater in diameter than the displacer which is #45 listed as aluminium heating piston, and the 15 mm x 40 mm size quoted would be it's finished size. #25 wick holder, I'll leave that to your imagination.I,d bore the power cylinder to about 12.5 mm, it is a nominal size, then make the power piston to fit, it should just slide through, and if you put your finger over the end the suction of it sliding should almost stop it, the clearance will probably be about 0.0125 mm/0.0005".

This is a similar type, although it is smaller with a 3/8" bore power piston, built from the scrap bin, and bits found around the workshop. This motor has ball bearing races for the main bearings on the crankshaft, and the big ends, crankshaft end.  The timing can be adjusted by sliding the vertical column to the left, or right, you can see the brass locking screw on the foot of the column.     Ian S C

Edited By Ian S C on 14/02/2016 11:50:13

[AjohnwParticipant @ajohnw51620]

There are plenty of free plans about on the web. Just search Stirling engine plans. Also some cheap ones. The quality of the drawings varies though.

Noticing Ian's comment about ratio's I have been slowly digesting this

**LINK**

It's possible to request 2 free plans from the many he has elsewhere on the site. They are pretty good but I always wonder why many people who provide plans for models don't number parts in the GA as well as naming them.

I have the plans for his low temperature engine and am likely to give it a go wondering if I can do better. No ice bucket.

John

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Edited By Ajohnw on 14/02/2016 12:17:07

[BOB BLACKSHAW 1Participant @bobblackshaw1]

Hello,

Thanks for these replies , and now have the information I need

Bob.

[Ian S CParticipant @iansc]

Bob, a good substitute for the solid aluminium displacer would be the steel case from an AA size NiCad, metal hydride, or alkaline battery would do nicely, it's 14 mm diameter x 50 mm long, in this case the displacer chamber should be bored out to16 mm. It just needs a little aluminium plug made to fit in the displacer rod.

It's not altogether helpful that the Grizzly instructions are in Chinglish, but as long as you know the conventional terms for the parts of the motor, it's easy enough to sort them out.

The hot cap on the wee motor in the photo is made from the case of a AA size NiCad. I'v got lots of dead AA Nicads from solar garden lights.

[AjohnwParticipant @ajohnw51620]

Those plans that Dave mentioned can be found on the web. Some of the links that are about are dead.

**LINK**

There are video's of it on his youtube channel.

John

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