Search found 24 matches

by tomostre
Tue May 19, 2015 2:49 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: another soda can water pump
Replies: 1
Views: 2819

another soda can water pump

[youtube]https://youtu.be/feaVOUooXbY[/youtube]
https://youtu.be/d2SCL07b-DM

same everything, different flywheels. The bigger one is a rotor from a pedal bike diskbrake. Everything recycled, (except glue)
by tomostre
Tue Apr 15, 2014 7:24 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Antartica Extreme Cold Stirling,4C Hot water,-60C Cold Air
Replies: 13
Views: 6817

Re: Antartica Extreme Cold Stirling,4C Hot water,-60C Cold A

more on the subject of cold air outside and dwelling ambient temperature: I think the main downfall of this idea is that you will be using energy to heat your camp, and your stirling wil literally pump that heat outside. However, I would like to challenge Ian (and all) that 60-something degrees celc...
by tomostre
Tue Apr 15, 2014 7:10 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Making it airtight
Replies: 3
Views: 3576

Re: Making it airtight

Hey, I am with Ian on this, length is the savior here, although I think you can get away with shorter than 25 mm, maybe even half of that. I found that a bicycle spoke makes an ok rod, with the bonus of threads on one side to attach it to something. The nut that goes on the spoke, once you file/dril...
by tomostre
Tue Apr 01, 2014 5:30 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: HELP! STIRLING ENGINE PROJECT
Replies: 6
Views: 4825

Re: HELP! STIRLING ENGINE PROJECT

find a free online copy of Andy Ross Building Stirling Engines; it will not have a solution in a box, but it will help you make your own CADs as you will have a good understanding of the thing. It is not quite 100 pages, read it in two hours.
by tomostre
Sun Mar 30, 2014 7:34 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Solar Powered LTD Twin Stirling Engine Generator (Gamma)
Replies: 26
Views: 15610

Re: Solar Powered LTD Twin Stirling Engine Generator (Gamma)

Hey guys,

I saw this earlier, its pretty hard to beat I think... Twin LTD Solar stirling
by tomostre
Sun Mar 30, 2014 7:25 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Displacer gap too big?,now with 2 cylinder building
Replies: 17
Views: 10320

Re: Displacer gap too big?

Hey Lars, how much empty space is there under the power membrane? Just a thought. Someone here said if you want RPM, go after power. Another thought, is the function of displacer is to displace air from hot to cold and back; the function of steel wool is regenerator, i.e. allow the cold air travelin...
by tomostre
Sat Mar 08, 2014 7:47 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Big problems getting my first stirling to work..Help
Replies: 11
Views: 6725

Re: Big problems getting my first stirling to work..Help

Great, go in the direction your gut takes you. Your first stirling is running, right? As a reference point, there are many variables that can make it more efficient, from density / weight /size of displacer, to length of tube (volume of dead air), bearings, flywheel design, crank throw, membrane mat...
by tomostre
Sat Mar 08, 2014 5:38 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Big problems getting my first stirling to work..Help
Replies: 11
Views: 6725

Re: Big problems getting my first stirling to work..Help

generally, nylon fishing wire going through a piece of inner tube will leak less then other heavier metal shafts. I would think of different gland designs, i guess the fun is testing one design vs another. Friction is the biggest enemy there, more then the leaks. As far as your pushrod - yes it can ...
by tomostre
Sat Mar 08, 2014 3:25 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: What percentage of the Ideal Stirling Cycle Can Be Harnessed
Replies: 2
Views: 3115

Re: What percentage of the Ideal Stirling Cycle Can Be Harne

you saw them videos suggesting a rotary displacer? also running a search for ideal stirling cycle showed a rotary sine slotted "cam", that might be pertinent to your question. Also, the ross yoke provides greater movement of piston then the crankthrow, making the whole thing perhaps more e...
by tomostre
Sat Mar 08, 2014 3:08 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: 2-cylinder Gamma - project
Replies: 69
Views: 36682

Re: 2-cylinder Gamma - project

displacer friction is easy to test - disconnect one from the crank, lift it and see if it drops under its own weight. When you say it does not run, does it "try" to run? (i.e. turn a couple of turns and stop) I would think something is leaking air - something that dried and shrunk during y...
by tomostre
Sat Mar 08, 2014 12:41 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Big problems getting my first stirling to work..Help
Replies: 11
Views: 6725

Re: Big problems getting my first stirling to work..Help

the stroke (up and down movement of the membrane) should be sufficient for the crank to make a full turn, so yes. A consideration though, is that smaller crank throw will give less leverage - to lift up the displacer, once the whole thing is connected.
by tomostre
Sat Mar 08, 2014 11:20 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Big problems getting my first stirling to work..Help
Replies: 11
Views: 6725

Re: Big problems getting my first stirling to work..Help

check seal: press lightly against the walls of pressure vessel. Does membrane react? if so, good. Check that it is not too tight - if the membrane is too tight, the pressure is insufficient to stretch it to make a 12x2mm stroke - heat the pressure vessel and move displacer by hand, does the membrane...
by tomostre
Sat Mar 08, 2014 6:25 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: pls help understand LTD free-piston
Replies: 1
Views: 2260

pls help understand LTD free-piston

Hi, I am not sure if this would be called free piston or ringbom type; I cant make it from the video how the displacer disk is connected to membrane(s). The comments in the video are useless, but i like the idea of not having friction or more then one hole in the pressure vessel. Please help me reve...
by tomostre
Wed Mar 05, 2014 7:58 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: 2-cylinder Gamma - project
Replies: 69
Views: 36682

Re: 2-cylinder Gamma - project

Hey guys, post the video please! You promised!