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by Ian S C
Fri Jan 19, 2018 2:29 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Heavy or lightweight displaser for more horsepower?
Replies: 4
Views: 59

Re: Heavy or lightweight displaser for more horsepower?

Wellington, yes use light weight steel, or stainless steel. Weight just causes extra friction, also the thicker metal conducts heat along it faster than thin metal. The thin metal acts as a regenerator picking up and dropping heat as the air goes past. As Trev says, don't use aluminium if you want a...
by Ian S C
Fri Jan 19, 2018 2:15 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Horse power figures of some historic engines
Replies: 3
Views: 90

Re: Horse power figures of some historic engines

Also a modern motor made to do work will be pressurized, even the Philips motor with very moderate pressure show a significant power increase over weight.
Ian S C
by Ian S C
Fri Jan 19, 2018 2:10 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Help needed: stirling engine cocktail shaker
Replies: 2
Views: 34

Re: Help needed: stirling engine cocktail shaker

The first motor is a flame licker, and if built to the right size would power the butter churn, or the tumbler. Forget the little Stirling, it won't do any more than drive the wee bloke with the axe. The Last motor is the one if you must buy rather than build your own. Ian S C [img] Test%20011%20(64...
by Ian S C
Thu Jan 18, 2018 2:29 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: water jacket for hot end
Replies: 4
Views: 70

Re: water jacket for hot end

There is two ways to get the right ratio , (1) if the power piston and the displacer are the same diameter, the stroke of the power piston must be reduced, meaning that either a two throw crank with different crank throws, or a bell crank with different length arms to give the same effect, this way ...
by Ian S C
Thu Jan 18, 2018 2:09 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Horse power figures of some historic engines
Replies: 3
Views: 90

Re: Horse power figures of some historic engines

Another way of looking at these motors is about one ton per HP. When quoting the power of each motor it can be useful to list the weight of the motor, they were heavy.
Philips MP 1002 CA: Wt without fuel 30kg, power output at generator, 180W, 220V 50Hz AC, engine speed 1500 rpm.
Ian S C
by Ian S C
Wed Jan 17, 2018 2:32 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engines with an internal spring question
Replies: 16
Views: 306

Re: Stirling engines with an internal spring question

Yes it will work, but anything over 1 mm is getting a bit heavy, the 2 mm thickness could be reduced by fitting it on a mandrel, and reducing the thickness by turning it in the lathe, you might have trouble with the welded seam, this is sometimes a bit hard.
Ian S C
by Ian S C
Wed Jan 17, 2018 2:27 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: water jacket for hot end
Replies: 4
Views: 70

Re: water jacket for hot end

It would have no comparison with an engine heated by a meths burner, the water jacket would have a maximum temperature of 100*C unless it was a pressure vessel like a boiler, in which case there would be a slight increase in temperature. If you made the water jacket a pressure vessel that would take...
by Ian S C
Sun Jan 14, 2018 2:36 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Assistance needed: Stirling model accessory- how heavy can it be?
Replies: 2
Views: 83

Re: Assistance needed: Stirling model accessory- how heavy can it be?

Hi Cocktail, what is it you want to drive? My engines drive a number of things, generators/alternators, a water pump, a power hacksaw, and fans. Once you have your motor, you can build a Prony Brake, and test the torque of your motor, and if you also use a tacho, you can check the revs. Ian S C [img...
by Ian S C
Sun Jan 14, 2018 2:21 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: First Sterling Finally Running
Replies: 24
Views: 1412

Re: First Sterling Finally Running

Depending on your heat source, you should be aiming at getting nearer to the 1.5 : 1 ratio that is considered the optimum ratio as used by Robert Stirling over 200 years ago.
Ian S C
by Ian S C
Sat Jan 13, 2018 2:59 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Tesla's "Ambient Heat Engine" Experiment
Replies: 22
Views: 5701

Re: Tesla's "Ambient Heat Engine" Experiment

I only have one thing to say on this type of technology, build it, and demonstrate the proof.
Ian S C
by Ian S C
Thu Jan 11, 2018 1:14 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: First Sterling Finally Running
Replies: 24
Views: 1412

Re: First Sterling Finally Running

With the twenty to one ratio, the motor will run on a lower temperature. I stick mine on the electric stove evert now and then while I cook my lunch, or put the LTD motor on top of the pot of vegetables while they cook.
Ian S C
by Ian S C
Tue Jan 09, 2018 3:17 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: First Sterling Finally Running
Replies: 24
Views: 1412

Re: First Sterling Finally Running

Another thing you can try, drive the motor in it's normal direction , you can use a rubber tired wheel in an electric drill against the flywheel, get it going about as fast as it normally goes, or faster if you feel its ok, after a few minutes feel the end of the hot cap, it should be getting quite ...
by Ian S C
Tue Jan 09, 2018 3:00 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Silver soldering stainless steel hot end
Replies: 12
Views: 207

Re: Silver soldering stainless steel hot end

I think the reported explosion was in a development engine at Philips in Holland. It was a pressurized motor, and it got oil in the wrong place, oil, heat, high pressure, Bang, just look at a diesel engine, that's how it works. I think someone was killed in that case. You are more likely to hurt you...
by Ian S C
Tue Jan 09, 2018 2:52 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Stirling engines with an internal spring question
Replies: 16
Views: 306

Re: Stirling engines with an internal spring question

The magnets I use came from an old micro wave oven, I just use magnets on the power piston, the displacer works as a Ringbom motor type and the springs on that act as bumpers to stop the displacer hitting the ends of the hot chamber. Here's another view of the power piston and magnets. The motor in ...
by Ian S C
Mon Jan 08, 2018 1:48 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Silver soldering stainless steel hot end
Replies: 12
Views: 207

Re: Silver soldering stainless steel hot end

Sorry don't know what they are made of, they don't seem to rust, the silver solder, or braze easily, I actually use brass, usually brass sheet cut in thin strips. Materials (for me) is a case of what I can find, I do buy some bits of aluminium off cuts. The only bought in piece in the photo of the l...

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