Search found 2214 matches

by Ian S C
Fri Jun 21, 2019 3:14 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Robinson Hot Air Engine
Replies: 13
Views: 362

Re: Robinson Hot Air Engine

Little hot air motors aren't quite useless, here is my ALPHA motor, 20 mm stroke x 30 mm bore, free running max revs 1800 rpm, best working speed 600 rpm - 800 rpm, and here it has a mini power hacksaw, that with a new blade, and a bit of luck it will cut through a bit of 10 mm rebar (steel) in abou...
by Ian S C
Fri Jun 21, 2019 3:03 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Proposed Air Cooling Tower
Replies: 7
Views: 146

Re: Proposed Air Cooling Tower

How long is a bit of string? Length of run depends on a number of things, And small hot air motors will run for quite a while after the water is all gone. To overcome the problem you could have a water tank to feed water to the cooling tower with a float valve to control the water level. Also if you...
by Ian S C
Thu Jun 20, 2019 2:08 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Proposed Air Cooling Tower
Replies: 7
Views: 146

Re: Proposed Air Cooling Tower

Without any maths, my guess is that it looks ok as is, for a bit more air through it a little fan might just get the air moving. My old motor in your Robinson thread has a 12V fan from a computer driven by the generator which also will power a transistor radio. The radiator has 3 rows ot flat tubes ...
by Ian S C
Wed Jun 19, 2019 3:33 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Proposed Air Cooling Tower
Replies: 7
Views: 146

Re: Proposed Air Cooling Tower

Trevor, this is similar to a cooling system used on some old hit and miss "barn engines", that system (comparing to yours), starts with the water reservoir, through the engine, the outlet is then released over a tent like structure of wire mesh on top of the reservoir. The main thing against this ty...
by Ian S C
Mon Jun 17, 2019 5:57 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Robinson Hot Air Engine
Replies: 13
Views: 362

Re: Robinson Hot Air Engine

It seems that there are a few 'model engineers" in the Cairns area, there is a couple on the Model Engineer web site, Hopper, and Brian, the former an experienced modeler, and the latter a newby. My second motor used a sewing machine wheel for many years until I needed it for another motor, so I mad...
by Ian S C
Sun Jun 16, 2019 3:08 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Robinson Hot Air Engine
Replies: 13
Views: 362

Re: Robinson Hot Air Engine

Trev, it's a good feeling when you get a motor that you built your self going. I build my motors to be developed, so I don't do much painting, usually just the flywheel. Have known people that have got their motor going, then stripped it down and painted it, then had trouble getting it going again. ...
by Ian S C
Fri Jun 14, 2019 5:50 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Robinson Hot Air Engine
Replies: 13
Views: 362

Re: Robinson Hot Air Engine

Qn the full size motor the vertical rectangle between the crank and the flywheel is the water tank. The piston on the motor in the photo is 10" dia, and the axe is to chop the wood for the fire, the owner didn't have any fire wood at home, so he got some bags of fire wood at the petrol station on hi...
by Ian S C
Thu Jun 13, 2019 2:46 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Robinson Hot Air Engine
Replies: 13
Views: 362

Re: Robinson Hot Air Engine

With the Robinson the displacer is short and fat, and in full size has an internal regenerator. At a glance I would say that you are going in the right direction. Here's a photo of a mates Robinson a the local A&P Show the day after it arrived in New Zealand from Australia. Ian S C DSC00729 (640x480...
by Ian S C
Mon Jun 03, 2019 2:15 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: 2 KWh LTD Stirling Engine
Replies: 28
Views: 17197

Re: 2 KWh LTD Stirling Engine

I'm looking at a thermos flask, and a hot air motor, do you think it's worth combining the two to see how they go. Maybe I'll wait a while until the temperature goes up a bit, and we get out of mid winter. tew, try putting a lighter motor on the LTD, or find a brushless permanent magnet motor and ru...
by Ian S C
Mon May 06, 2019 4:10 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The new member with first engine
Replies: 18
Views: 6973

Re: The new member with first engine

Is the bore of the cylinder highly polished? The preferred cylinder for graphite pistons seems to be precision ground glass, stainless steel would be second on the list, followed by cast iron and carbon steel(mild steel is OK), bronze and brass would be good. Aluminium unless treated comes in way do...
by Ian S C
Sat May 04, 2019 3:33 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: The new member with first engine
Replies: 18
Views: 6973

Re: The new member with first engine

What is the power piston and cylinder made of, and how far under the hot cap do you put the flame? What is the fly wheel made of?
Ian S C
by Ian S C
Sat May 04, 2019 3:24 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Melvin Engine
Replies: 16
Views: 1344

Re: Melvin Engine

Mmm, your not going to find a cast iron cylinder liner that size are you, unless you find a medium size marine diesel, the bore was a little larger than what I was thinking, I'v got a 5 1/2" liner out in the workshop, and I thought that was fairly large, I was thinking of cutting it in half to make ...
by Ian S C
Fri May 03, 2019 3:49 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: oil
Replies: 7
Views: 3260

Re: oil

Every now and then I spray a little brake cleaner fluid down the cylinder, and wash the oil, and any gummy deposits out. The main thing I try for is minimum oil.
Ian S C
by Ian S C
Thu May 02, 2019 2:33 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: oil
Replies: 7
Views: 3260

Re: oil

Don't use WD-40, that and similar stuff is OK when first put on, but when the lighter liquids evaporate it leaves a thin film (this is what protects the metal from rust), maybe you'll get away with this a couple of times, then the build up just stops every thing until you strip the motor and clean i...
by Ian S C
Wed Apr 24, 2019 3:45 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Square pistons/cylinders
Replies: 8
Views: 919

Re: Square pistons/cylinders

With the L shape ALPHA, what you loose to dead space you gain on less mechanical parts, although with the ALPHA motor there is less friction on the pistons as there is virtually no side movement with the con rods not moving side to side as they do with a crank. I changed the bell crank guide to a ca...