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2020 Had my full size flash steam engine running

2020 Had my full size flash steam engine running

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Windy05/01/2020 15:56:32
790 forum posts
153 photos

Had my full size flash steam engine running yesterday on compressed air unfortunately have not got too much pressure and quantity for high rpm so just a pop, pop at low rpm.

Had to retard inlet poppet valve and use compression release valve to enable it to run with my limited compressor also added temporally extra mass to crankshaft for this test a lathe chuck.

Would run on about 90psi with this setup but need a lot more pressure to run on the proper valve settings..

Neil Wyatt05/01/2020 18:39:35
18099 forum posts
713 photos
77 articles

Crikey folks, clear the runway.... Windy's coming through....

Big milestone, when does it go in a frame?


Windy05/01/2020 23:08:29
790 forum posts
153 photos

Another test running on compressed air.


Windy08/01/2020 14:19:24
790 forum posts
153 photos

Not sure if my link worked on my slow speed test runs so will try this.


Howard Lewis08/01/2020 14:42:40
3536 forum posts
2 photos

Very Good. Obviously expanding nicely, judged by the condensate in the exhaust.

Wondered why the Tacho case was in the swarf tray of the Myford, but found out towards the end of the video.

Should be quite something after fine tuning!


duncan webster08/01/2020 15:33:08
2732 forum posts
40 photos

Wonderful! Is the poppet valve pressure balanced in any way, or does it just open against HP steam?

Windy08/01/2020 17:28:57
790 forum posts
153 photos
Posted by duncan webster on 08/01/2020 15:33:08:

Wonderful! Is the poppet valve pressure balanced in any way, or does it just open against HP steam?

Afraid not I played about with them in my early days with the model but have high rpm to contend with.

Discussing this with my steam rocket drag motorcycle friend when his poppet valves went wrong against tons of water pressure.

We came up with a very simple nearly balanced poppet valves they would probably be ok at slow speed openings.

He decided on a butterfly type valve instead from America that their water, steam rocket people use successfully.

The successfully Canyon jump machine jets were similar to his rocket motorcycle power unit.

graham sykes force of nature steam machine.jpg


Edited By Windy on 08/01/2020 17:31:52

Windy14/01/2020 01:28:35
790 forum posts
153 photos

Have been looking at full size water pump pulsation dampeners the industrial ones would make a hole in my wallet.

Been thinking of certain paint ball and aqua diving bottles that might be a possibility.

They are available in many sizes and pressures to 45000 psi they are aluminium or carbon fibre.

Any thoughts and designs that members might know of.

Would prefer to buy one that is certificated otherwise might make one.


Jeff Dayman14/01/2020 07:01:47
1848 forum posts
45 photos

For a DIY pulsation damper, could you maybe use a piston in a cylinder, working against a spring? (Like a safety valve, but without vents)

Maybe a pneumatic cylinder off the shelf , with a beefier spring? I've seen such cylinders in surplus places going quite cheaply. Many are good for 400 psi plus. Just food for thought.

DiogenesII14/01/2020 07:56:52
128 forum posts
50 photos

Bottles for recharging air rifles come in at least 3,4,5,7 litre, & larger sizes, usually rated 300bar. They like lightweight ones to carry in the field..


Edited By DiogenesII on 14/01/2020 07:57:38

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