Search found 10 matches

by jorgealdobr
Fri Jan 24, 2014 2:44 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine project
Replies: 21
Views: 11554

Re: My stirling engine project

Even if not required, would it make the engine worse ?

Its very convenient to wrap a coil around it...
by jorgealdobr
Thu Jan 23, 2014 4:50 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine project
Replies: 21
Views: 11554

Re: My stirling engine project

I've found out that dropbox can make printscreens go to the web automagically... The results are in my gallery : http://stirlingengineforum.com/gallery/album.php?album_id=35 Orange things are made of bronze (two kinds : the cylinder cups are pure bronze with a high enough melting point and the pisto...
by jorgealdobr
Wed Jan 22, 2014 5:56 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine project
Replies: 21
Views: 11554

Re: My stirling engine project

I am having problems with converting FreeCAD models to images, that why i dont have images of the engine.

The engine is yet purely hypothetical, i cant build until i get to the project class of the mechatronics course (and the teacher approves the project).
by jorgealdobr
Mon Jan 20, 2014 7:37 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine project
Replies: 21
Views: 11554

Re: My stirling engine project

Its on the first post : FreeCAD

its a free cad ::eek:
by jorgealdobr
Mon Jan 13, 2014 7:37 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine project
Replies: 21
Views: 11554

Re: My stirling engine project

this is the machine, on dropbox.

V-Stirling mk2
by jorgealdobr
Fri Jan 10, 2014 7:54 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine project
Replies: 21
Views: 11554

Re: My stirling engine project

The part exposed to fire should be made out of brass, a specific alloy of brass that has 1200ºC melting point and has good thermal conductivity.

I dont know if the cylinder block will reach 600º to melt aluminum, but you are right, even if it doesnt melt, the heat is enough to modify its structure...
by jorgealdobr
Fri Jan 10, 2014 6:56 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine project
Replies: 21
Views: 11554

Re: My stirling engine project

The idea was that aluminum is cheap to work with (i can use a homebrew crucible o cast it, while steel is out of hope for home). Having the graphite-brass as a "ring" means that the bearing is aluminum vs graphite-brass, not aluminum vs aluminum. Even if the aluminum is not all that hard, ...
by jorgealdobr
Thu Jan 09, 2014 9:24 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine project
Replies: 21
Views: 11554

Re: My stirling engine project

Its an V-Alpha, with square cylinders and heylandt crowns on both pistons. I calculated it using the beale formula : 0,15 = 412,5 / (0,5 * 25 * V) 0,15 = beale number 412,2 = power produced after efficiency correction (W_engine = W_burner * Nc). 0,5 = half mega pascal (or 5 ATM). the engine stopped ...
by jorgealdobr
Wed Jan 08, 2014 4:30 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: My stirling engine project
Replies: 21
Views: 11554

My stirling engine project

This is my latest attempt at designing a stirling engine. I use the free software FreeCAD. The engine is a square cylinder (heigth = diameter) with 220cc Calculation was done using beale fomula. I expect it to generate 80W of eletrical power (from 150W of mechanical power) when coupled with a genera...
by jorgealdobr
Wed Jan 08, 2014 3:59 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: New Members PLEASE read! - OR, having problems registering, being deactivated
Replies: 511
Views: 520933

Re: "Hi" We are new here!

Hi ! I am there !

My name is Jorge Aldo and i am from Brazil.

I study mechatronics at a local technical school.