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by Ian S C
Tue Feb 20, 2018 2:18 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Blechspielzeug engines
Replies: 1
Views: 32

Re: Blechspielzeug engines

I would say it's still moderately small. Although the don't look as pretty as store bought engines, I prefer to build my own. For someone without a machine shop it looks quite nice. I have a little Bohm HB7, it is often difficult to get going, each time I have to remove the piston, and clean the bor...
by Ian S C
Sun Feb 18, 2018 1:21 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: More volume on the hot side?
Replies: 7
Views: 206

Re: More volume on the hot side?

The cold piston should have as little bulk as possible to enhance the rate of cooling, the crown is only effective on the hot cylinder.
Ian S C
by Ian S C
Sun Feb 18, 2018 1:16 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Making a stirling engine 5 kw generator
Replies: 8
Views: 263

Re: Making a stirling engine 5 kw generator

The fuel you use depends on what you have, gas is easiest, then comes liquid fuel that could be a number of things, alcohol, petrol, oil (mineral, or vegetable), kerosene/paraffin, hand wash gel. Then comes solid fuel, coal, or wood, dried animal manure/dung. One design for a 5hp Stirling Engine for...
by Ian S C
Sat Feb 17, 2018 4:03 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: New flame eater with homemade gear
Replies: 8
Views: 192

Re: New flame eater with homemade gear

The fins are ok, but to be more effective the gap could be wider unless forced air is used. Just my idea, might not be correct in practice.
Ian S C
by Ian S C
Fri Feb 16, 2018 2:20 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Making Stirling engine with glass syringe
Replies: 2
Views: 80

Re: Making Stirling engine with glass syringe

Have a look on Google for a Japanese chap called Koichi Hirata and Stirling Engines, you will find plans there.
Ian S C
by Ian S C
Wed Feb 14, 2018 2:58 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: New flame eater with homemade gear
Replies: 8
Views: 192

Re: New flame eater with homemade gear

That runs very well, good work.
Ian S C
by Ian S C
Tue Feb 13, 2018 4:16 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Expansion on the hot end
Replies: 4
Views: 116

Re: Expansion on the hot end

AnonAustria, On my Ross Yoke ALPHA motor I have cast iron pistons in cast iron cylinders. When first built both cylinders and pistons were the same size, having the same clearance, but the engine seized on the first run, so it was stripped and the hot piston polished down about .0005" to allow ...
by Ian S C
Fri Feb 09, 2018 3:21 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Gamma Fan #2
Replies: 5
Views: 309

Re: Gamma Fan #2

Yes a square motor would be good(stroke = bore). A number of my motors will run without a flywheel, lots of revs, no power, but I think its quite a good test of a free running motor.
Ian S C
by Ian S C
Thu Feb 08, 2018 1:57 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Gamma Fan #2
Replies: 5
Views: 309

Re: Gamma Fan #2

I just pick a number and build, well not quite, I wanted a fairly small angle on the con rod, so the 20 mm stroke, this also allows reasonably high revs, and I think a short stroking motor does not need a very large flywheel, this motor uses the fan as it's flywheel, and the blades on that are quite...
by Ian S C
Thu Feb 08, 2018 1:34 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: More volume on the hot side?
Replies: 7
Views: 206

Re: More volume on the hot side?

Not really, you have to have some thing to heat, and having a short hot end would get the heated area too close to the cold side, you just need a hot cap similar to a GAMMA, or BETA motor. I'm no sure if there is an ideal length for the Heylandt Crown, but some where about 1 to 1.5 times the diamete...
by Ian S C
Wed Feb 07, 2018 3:22 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: More volume on the hot side?
Replies: 7
Views: 206

Re: More volume on the hot side?

The hot side has the bit that "sticks out" so it can be heated, the hot piston has an extension on it similar to a displacer in other motors, this is called a Heylandt Crown, this fits in the hot cap with a gap same as a displacer, it does keep the direct heat off the top of the piston. He...
by Ian S C
Tue Feb 06, 2018 2:37 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Using air cylinder for power piston?
Replies: 3
Views: 114

Re: Using air cylinder for power piston?

Mm interesting, that's quite a big cylinder.
Ian S C
by Ian S C
Tue Feb 06, 2018 2:24 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Temperature/preessure change while running?
Replies: 8
Views: 196

Re: Temperature/preessure change while running?

I think you should aim at a crankshaft speed of 500 to 1000 rpm, the advantage of gearing up the flywheel is that you can reduce the mass of it, you'll have to do the maths, but if you double the speed the flywheel can be about 1/4 the mass, or something like that.
Ian S C
by Ian S C
Tue Feb 06, 2018 2:17 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Making a stirling engine 5 kw generator
Replies: 8
Views: 263

Re: Making a stirling engine 5 kw generator

I would go for a multi cylinder ALPHA motor, maybe 6 or 8 cylinders, that would keep the weight of the moving parts down, another thing that would help reduce size is pressurization. It's still going to be quite large when you consider that the Philips Bungalow generator produced about 200 Watts. Ia...
by Ian S C
Mon Feb 05, 2018 3:04 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Using air cylinder for power piston?
Replies: 3
Views: 114

Re: Using air cylinder for power piston?

I presume you mean the Airpot glass cylinders with a graphite piston, have not tried them, but would if I could. At one time you could get free samples, maybe you still can, but it maybe only for those in the USA.
Ian S C

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