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by Ian S C
Tue Nov 14, 2017 2:20 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Trying to build beta stirling engine
Replies: 2
Views: 124

Re: Trying to build beta stirling engine

As the bore for the displacer and power piston is the same, the stroke of the displacer must be increased to obtain the ratio of 1.5 : 1, ie 20 mm stroke for the power piston, 30 mm stroke for the displacer. This is the second motor that I built in 1994, its still going strong. Its based on Dyna, a ...
by Ian S C
Tue Nov 14, 2017 1:57 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Very clever Siemens style 8 cylinder engine
Replies: 1
Views: 97

Re: Very clever Siemens style 8 cylinder engine

The Whispergen has a 4 cylinder engine of this type with their own patented Z drive to the alternator, On talking to Dr Don Clucus(the designer/builder), he reckoned it was the most efficient, and compact design he could come up with.
Ian S C
by Ian S C
Mon Nov 13, 2017 2:00 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Pressurization
Replies: 20
Views: 2728

Re: Pressurization

With the early "pressurized" engines the basic idea of the pump was to replace lost air. to keep the internal pressure at, or just above atmospheric pressure.
Ian S C
by Ian S C
Fri Nov 10, 2017 1:37 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Thermo like propane engine
Replies: 2
Views: 122

Re: Thermo like propane engine

CBStirling, at that price it would be almost worth the gamble, a number of the motors on that site are really cheap, about a 1/3 the price similar motors sell here retail.
Ian S C
by Ian S C
Thu Nov 09, 2017 2:35 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Help me with my LTD.
Replies: 6
Views: 187

Re: Help me with my LTD.

The clearance in the displacer is not critical (I suppose it might be if you need every thing 100% perfect). I'm not sure what the top and bottom clearance is on mine, its probably about 3 mm. My one has ball bearing races on the big ends of the con rods as well as the main bearings on the crank sha...
by Ian S C
Wed Nov 08, 2017 5:53 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Help me with my LTD.
Replies: 6
Views: 187

Re: Help me with my LTD.

For a LTD motor the displacer looks ok, could perhaps have a little less clearance on the diameter, my one has about 1/4"/6 mm clearance, the bore of the displacer is about 160 mm. The flywheel is a ring cut from the edge of the top plate of the motor, the spokes are made of bicycle spokes glue...
by Ian S C
Wed Nov 08, 2017 2:33 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Help me with my LTD.
Replies: 6
Views: 187

Re: Help me with my LTD.

old-ocker, you might try another one or two CDs on the flywheel. Are you sure that all the angles are ok, ie the crankshaft is square to the piston, and the crank pins to the con rods, the thing that really kills thes motors is friction. Get it all right and it will work, just that they can be a bit...
by Ian S C
Sun Nov 05, 2017 6:40 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Imploding displacer - make it leaky?
Replies: 3
Views: 181

Re: Imploding displacer - make it leaky?

The engine that has made the most use of the hollow rod hasa a bore of 1 3/3", and the rod is made of 5 mm stainless steel tube, its disassembled at the moment, but in its life since 1994 it has probably put in over 2000 hours of use. the busf through the piston is made of Teflon and that shows...
by Ian S C
Thu Nov 02, 2017 3:00 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Imploding displacer - make it leaky?
Replies: 3
Views: 181

Re: Imploding displacer - make it leaky?

What is the displacer made of? No you don't want any sized hole in the displacer inside the motor, with an atmospheric motor I have used a hollow guide rod venting the displacer to atmospheric pressure. This is the result of using aluminium for a displacer, the third displacer was made of stainless ...
by Ian S C
Mon Oct 30, 2017 1:33 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Are LTD Stirlings Suitable for power generation?
Replies: 12
Views: 2053

Re: Are LTD Stirlings Suitable for power generation?

Here's what you get in old style Robinson hot air engine, not sure of the weight, must be getting on toward a ton, it's got a 10 inch bore, and produces about 1/3 hp.
Ian S C
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by Ian S C
Sun Oct 29, 2017 4:30 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: First Sterling Finally Running
Replies: 12
Views: 510

Re: First Sterling Finally Running

I wouldn't exactly say beautiful, it usually works, but not really fast enough, the maximum speed is about 1000 hz, and I would like 3000 hz, it does generate a little power, enough to run the radio, but the low frequency AC current takes a fair bit of smoothing to get a DC current without too much ...
by Ian S C
Sat Oct 28, 2017 5:45 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: First Sterling Finally Running
Replies: 12
Views: 510

Re: First Sterling Finally Running

With a ring burner with the motor vertical with the hot end up, the heat rises, easier to keep the cold end cool.
This is my free piston motor, it's a bit rough, it's been modified a number of times. Burner at the top.
Ian S C
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by Ian S C
Sat Oct 28, 2017 5:14 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: New to Stirling Engines...where to start?!
Replies: 7
Views: 992

Re: New to Stirling Engines...where to start?!

The reason I asked what gear you have is that I build my motors from solid, using a lathe, milling machine, and a gas torch for brazing, but you don't need all that rubbish if you build one of the many tin can motors, and these can be most satisfying to run, and if well made, quite(for a Stirling En...
by Ian S C
Sat Oct 28, 2017 5:01 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: MY FINISHED MODEL Robert Stirling's Famous Hot Ait Engine
Replies: 8
Views: 233

Re: MY FINISHED MODEL Robert Stirling's Famous Hot Ait Engine

On the motor with the bell crank/Ross Yoke is symmetrical, as the motor is an ALPHA type, with equal bore and stroke in both the hot and cold cylinders. This type of linkage can be used in a GAMMER motor, and if the bores are the same the yoke is made with a ratio of 1.5 (displacer): 1 (power piston...
by Ian S C
Fri Oct 27, 2017 4:05 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: MY FINISHED MODEL Robert Stirling's Famous Hot Ait Engine
Replies: 8
Views: 233

Re: MY FINISHED MODEL Robert Stirling's Famous Hot Ait Engine

I think what I would do with that flywheel is wind some copper wire in the grove until nearly full, then use some body filler to bring it up to flush, smooth it off, then paint it. You would be surprised how little flywheel is needed to get one of these things running. One of my bigger motors will r...

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