Recent Posts

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11
Other / Re: Steam Engine!!!
« Last post by hiker on January 16, 2018, 08:31:26 PM »
Nice vid..looks like a old  Hit and Miss ..engine.....
12
Other / Re: Steam Engine!!!
« Last post by JW on January 16, 2018, 07:01:21 PM »
I remember long ago that I would rather build something when I was young, than to have regretted not building it when I was older.

Flash steam is what is produced when water is under pressure is injected into a piston cylinder under high temps. Water can expand 1700 to 1 as steam from liquid to steam.

The flash steam systems are under from 3000psi to 5000psi before injection. The water expands in the engine cylinder to steam.

These are inherently high pressure injections but since the tube is seamless with good wall thickness there is no large dangerous reserves or boilers/drum. Its all 3/8in tubing.

Anyone who has one of the injectors can make an engine run several possible ways.   
13
Other / Re: Steam Engine!!!
« Last post by JW on January 16, 2018, 04:02:17 PM »
These are some videos of the engine running, were ready to make the transition to "flash steam"

You'll have to excuse my mess in the second video.

ACB R&D 2002 L.mp4
https://www.youtube.com/watch?v=D-5UIxJ11iY

ACB R&D 2004
https://www.youtube.com/watch?v=jZasy9XNbYU

I still have a few things to complete before I can make the transition to steam. On all the engines I run the condenser open to atmosphere. 
14
Other / Re: Steam Engine!!!
« Last post by JW on January 16, 2018, 03:44:37 PM »
When I build and calculate things I have to assign a trend of positive pressure. When im buying parts I cant say 0psi. The exhaust has pressure pulses. I installed a bore at the top of the piston bottom at dead center. There's pressure there at that moment the pressure is about 40psi, then its gone as the piston moves up and the exhaust valve opens. I know this because I have done dynamic testing using 2400psi it will run all the way down to 600psi feeding the injector valve. Its remarkable how well the injection valve works especially throttling.

I sent my metal hose out to get some ends fitted it for the burner today.   
15
Controls / New power point heater near testing
« Last post by OperaHouse on January 16, 2018, 01:24:36 PM »
If I could just get some sun I could test this. 3525 inverter based board, not ideal, just a concept for non micro based power pv point water heating.  Slowed down to about 1.2ms it is 50% 0N and 50% OFF with enough OFF time to extinguish arc. Dead time is not easily changed with this board. With only half power max, it is targeted for higher voltage operation and mechanical switches.  Latching shutdown is disabled which allows on board opto isolator tobe used with electronic temperature control.  Then two FET can be paralleled for nearly 100% duty cycle for lower voltage elements.  A TL494 design will be tried in about three weeks. Everything except power FET easily fits on a convenient NANO breakout board with screw terminals for a nice look.

Attachments: 3825mod1.JPG * 3825mod1.JPG ( - downloaded times.)
3525MOD66uf.jpg * 3525MOD66uf.jpg ( - downloaded times.)

16
Wind / Re: Active Pitchcontrol
« Last post by mbouwer on January 16, 2018, 12:36:09 PM »
Especially at stormy weather pitch contol promotes a good night sleep.
How can we improve the components?

Attachments: pitch control.jpg * pitch control.jpg ( - downloaded times.)

17
Hydro / Re: Hey all
« Last post by vimes1984 on January 16, 2018, 12:28:08 PM »
Can i ask why you need to go for a waterwheel first? building a water wheel to make use of 10m head of water is a BIG project - much harder (and more expensive) than using a turbine i would think?
Because it needs to be aesthetically pleasing to my better half and half a ton of concrete is not  :D
18
Hydro / Re: Hey all
« Last post by mab on January 16, 2018, 11:57:50 AM »
Can i ask why you need to go for a waterwheel first? building a water wheel to make use of 10m head of water is a BIG project - much harder (and more expensive) than using a turbine i would think?
19
Hydro / Re: Hey all
« Last post by electrondady1 on January 16, 2018, 10:38:57 AM »
there are a lot of videos about these vortex types of water wheels https://youtu.be/XiefORPamLU
20
Wind / Re: The Zubbly files
« Last post by BruceDownunder on January 15, 2018, 11:16:36 PM »
Wow,

   Came across this topic ju now , it,s like a late Christmas gift to me -takes me back to Zubbly,s days of him and his red lattice tower beside the swimming pool in his backyard.


  His Son, ? is he carrying on Dads work? He was interested ,back then!.

 Anyhow , hello to all the guys that remember me from downunder and you probably still have my album of related stuff ,,welcome to use any of it - Zubbly and I posted topic often . He fell off that tower once , then such a sad day ,I still remember it way back , when I heard he had sadly passed away ..

Thanks for the memories ,

Rest in peace , dear Zubbly .

 Bruce
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