Search found 2219 matches

by Ian S C
Sun Oct 02, 2011 4:50 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Smaller walking beam
Replies: 13
Views: 7950

Re: Smaller walking beam

picnic, one thing I would suggest is that the displacer rod bush should be made longer, 20 mm would be some were near what I would think of, a little more or less, no matter. In a short bush the rod can tend to move sideways, and sort of wedge its self a bit, longer the better, also better as sealin...
by Ian S C
Sat Oct 01, 2011 6:48 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Output power of alpha stirling.
Replies: 5
Views: 5458

Re: Output power of alpha stirling.

Hi, found a bit more, go to google and put in Thermodynamic analysis of a stirling engine, theres quite a bit there, all the best Ian S C
by Ian S C
Sat Oct 01, 2011 2:28 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Output power of alpha stirling.
Replies: 5
Views: 5458

Re: Output power of alpha stirling.

Aviator168, there is a site that gives a fomula, it may be on the links section of this site, I'll look around a bit and see what comes up. Any formula will only give a theoretic power reading, but I suppose it gives an idea. I just work on the Idea that if your lucky 1 watt per cc is about what you...
by Ian S C
Sat Oct 01, 2011 2:19 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Smaller walking beam
Replies: 13
Views: 7950

Re: Smaller walking beam

picnic, 50 mm length will work, 60 mm would be better, and 1.5 to 2 mm would be a better gap, erring on the small size. The length of the cylinder is the length of the displacer, plus the stroke, plus the gap at each end. As far as the thirds go, the one third gets heated the one at the other end ge...
by Ian S C
Fri Sep 30, 2011 4:51 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: First run of beam engine
Replies: 8
Views: 6693

Re: First run of beam engine

At the moment its a bit arthritic, but with a bit bigger flywheel, even if you leave the existing flywheel in place will help. Give it a run regularily, I seem to use gallons of meths, and heaps of LPG. My second motor did 2000hrs before its first overhaul, I did'nt count how many times I filled the...
by Ian S C
Fri Sep 30, 2011 4:32 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Output power of alpha stirling.
Replies: 5
Views: 5458

Re: Output power of alpha stirling.

I suppose you can easily get the pressure/ area measurement, ie., pounds per sq inch, grams per sq cm, that does not take into account friction. To calculate the power of my engines, I fit a brake to measure torque, and a tacho to measure the revs, when I checked my Ross Yoke motor it came to 5 watt...
by Ian S C
Thu Sep 29, 2011 3:07 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Smaller walking beam
Replies: 13
Views: 7950

Re: Smaller walking beam

What is the full size engine? Ian S C
by Ian S C
Wed Sep 28, 2011 7:14 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Smaller walking beam
Replies: 13
Views: 7950

Re: Smaller walking beam

Yes you'v got the ratio right. I imagine that the 9.5 mm is the outside dia of the power cylinder. If the two- power and displacer have the same stroke, I think (my maths is a bit weak) that the bore of the power cylinder should be about 11/16". It would be possible to use the 7.5 mm dia but th...
by Ian S C
Tue Sep 27, 2011 9:27 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Smaller walking beam
Replies: 13
Views: 7950

Re: Smaller walking beam

Hi Picnic, that size should work OK, a 1" dia displacer should be about 3" long, and the displacer cylinder the legth of the stroke longer, plus the gap at each end. The ratio of volume between the displacer and the power cylinder should be someware about 1.5:1, thats fairly univesal for h...
by Ian S C
Sat Sep 24, 2011 5:27 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: 10 kW Ringbom-Stirling with generator for sale
Replies: 20
Views: 29986

Re: 10 kW Ringbom-Stirling with generator for sale

According to the info,the shaft power is 11.7Kw, the generator is 95% efficient, the motor uses 900 W driving fans pumps and controls, sounds about right. Ian S C
by Ian S C
Sat Sep 24, 2011 4:52 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Some questions for my first engine
Replies: 5
Views: 4076

Re: Some questions for my first engine

Dyna is on page 145 of the first "Sirling Engine Manual", also page 165 in "Modelling Stirling and Hot Air Engines" by James G. Rizzo (a paper back, my first book on hot air engines), maybe you have the second Stirling engine manual. Ian S C
by Ian S C
Fri Sep 23, 2011 5:13 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: problems with link area
Replies: 2
Views: 3411

Re: problems with link area

Ditto, I have the same problem! Ian S C
by Ian S C
Wed Sep 21, 2011 5:23 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Some questions for my first engine
Replies: 5
Views: 4076

Re: Some questions for my first engine

DavMecha, The only thing with freznel lensses,is thatthe heat is only consentrated on a very small spot, I'v tried it on the end, and side of the displacer cylinder, with no noticable difference, on a good sunny day, i think it was about 28 deg C (about 82 F), I was getting more power than I normall...
by Ian S C
Wed Sep 21, 2011 1:10 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: 5000 W atmosferic engine
Replies: 13
Views: 7658

Re: 5000 W atmosferic engine

skunkworks, sorry I'v been away for a couple of days, yes atmopheric = unpressurised. As the pressure goes up, the power goes with it, not a mathimatition, so i can't say the comparasin between the two. Ian S C
by Ian S C
Sun Sep 18, 2011 10:02 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: 5000 W atmosferic engine
Replies: 13
Views: 7658

Re: 5000 W atmosferic engine

Please note that an ALPHA motor doe's not have a displacer, the hot piston may have aHeylandt crown, a light weight (stainless steel) cap on top of the piston to insulate the piston from the heat of the hot cylinder. Its construction is similar to a displacer, but is attached to a compressive piston...