Search found 2214 matches

by Ian S C
Thu Feb 21, 2019 1:50 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: What type of Stirling Engine
Replies: 7
Views: 1228

Re: What type of Stirling Engine

The use of solar heat depends a lot on geography, the nearer the equator the better, so it will work in the temperate regions. one important thing with any hot air motor is cooling.

Ian S C
by Ian S C
Tue Feb 12, 2019 3:21 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: "Hi...We are new here!" First posts here (or anywhere is OK)
Replies: 438
Views: 153105

Re: "Hi...We are new here!" First posts here (or anywhere is OK)

Hi Vandee, +30*C here today. I have only built two free piston motors, the first a BETA type didn't work too well, I found later that it was all my fault, too much steel around the magnets I had on the piston to generate power. The second one , a GAMMA motor goes quite well, plenty of aluminium, and...
by Ian S C
Tue Feb 05, 2019 1:15 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Whispergen mk4
Replies: 22
Views: 4919

Re: Whispergen mk4

You can soak some cloth in vinegar, and mask off the cast iron with some grease.

Ian S C
by Ian S C
Mon Feb 04, 2019 2:59 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Whispergen mk4
Replies: 22
Views: 4919

Re: Whispergen mk4

Vinegar, then a bristle brush, don't use a steel wire brush or steel wool, the aluminium will go rusty! There are aluminium treatment schemes used by the aviation industry. A system similar to sand blasting that uses crushed walnut shells called prunus blasting is what we used for cleaning carbon of...
by Ian S C
Sat Feb 02, 2019 2:39 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: cold acceptor in cold head for cryocooler
Replies: 3
Views: 706

Re: cold acceptor in cold head for cryocooler

Trev, Back in the 1990s there was a bit in Model Engineer very similar problem with the gas container on a STIRLING ENGINE freezing, also the cooling system was not quite keeping up. The cure was to part submerge the gas tank in the cooling water, then getting the balance between hot and cold, the w...
by Ian S C
Thu Jan 31, 2019 3:24 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: What type of Stirling Engine
Replies: 7
Views: 1228

Re: What type of Stirling Engine

I think the ALPHA type STIRLING engine is the most efficient. The TMG ( Thermo Mechanical Generator) Might be suitable. You will waste a lot of energy by heating another medium rather than heating the engine directly. I have used solar heating on a motor that normally is heated with LPG, and got mor...
by Ian S C
Wed Jan 30, 2019 2:22 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: cold acceptor in cold head for cryocooler
Replies: 3
Views: 706

Re: cold acceptor in cold head for cryocooler

The coldest part is the area that in a hot air engine would be the heated part, you need to take care of the cooling area too, because this gets quite hot. Good luck, it's fun trying.
Ian S C
by Ian S C
Tue Jan 29, 2019 2:38 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine school project
Replies: 28
Views: 2946

Re: My stirling engine school project

The V motor is more simple to build as you only need one pin on the crankshaft without extra links. I have only built one ALPHA motor, the one in the photos with the Ross Yoke, one advantage this type has is the elimination of side thrust on the pistons, this gets rid of a source of friction. Ian S C
by Ian S C
Sat Jan 26, 2019 2:58 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Registering, and Deactivated...PLEASE READ!
Replies: 12
Views: 11564

Re: Registering, and Deactivated...PLEASE READ!

Welcome to the gang Ron. These motors tend to be a bit addictive, and when you make them (the way I do) they get better(usually) with each new one. I'v been building since about 1990, have not done much except modify old ones for the last couple of years.

Ian S C
by Ian S C
Sat Jan 26, 2019 2:45 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Oddball theoretical question - ammonia absorption
Replies: 14
Views: 7772

Re: Oddball theoretical question - ammonia absorption

After I built my Ross Yoke ALPHA motor, I coupled it to my horizontal BETA motor via belt and pulleys, and after 20 minutes the temperature of the hot cap on the ALPHA motor dropped 40*C, from + 20*C to - 20*C, the motor driving produces about 5 Watts at the crankshaft. If a jacket of some sort was ...
by Ian S C
Sat Jan 26, 2019 2:20 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine school project
Replies: 28
Views: 2946

Re: My stirling engine school project

User1, spot on. Remember to down load Andy Ross's book.
Ian S C
by Ian S C
Thu Jan 24, 2019 1:35 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine school project
Replies: 28
Views: 2946

Re: My stirling engine school project

Yes, but you need to add the Heylandt Crown on top of the hot piston. Give it 1 mm to 1.5 mm clearance on the diameter, and 2 mm on the end, the crown should be as light as possible, mild steel is OK, but thin stainless steel is better. Make the bore of the cylinder and hot cap the same. If you use ...
by Ian S C
Wed Jan 23, 2019 4:24 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine school project
Replies: 28
Views: 2946

Re: My stirling engine school project

Here's a rough(very)sketch of an ALPHA hot end, note where the air transfer port is. The piston in any Stirling Engine should fit very well, if you place the piston in the open (at each end) cylinder it should slide through under it's own weight, and if you block one end the piston should stop slidi...
by Ian S C
Tue Jan 22, 2019 3:07 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine school project
Replies: 28
Views: 2946

Re: My stirling engine school project

The same motor before I changed it to air cooling, with the little power hacksaw that sometimes replaces the generator. It will actually cut a 13 mm steel bar in a bit over 20 minutes, not too bad for about 5Watts of power.
Ian S C

Image
by Ian S C
Sat Jan 19, 2019 3:46 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine school project
Replies: 28
Views: 2946

Re: My stirling engine school project

Hi User1, If you are building an ALPHA motor, it"s worth down loading Andy Ross's book "Making Stirling Engines", it's a free download, if you print it out it's 68 pages. No, steel wool won't work, you must have 2 well fitting pistons in proper cylinders, one the hot cylinder has an extension, the h...