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Concept for twin flame licker..

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John Hill:

--- Quote from: NickG on September 16, 2010, 09:23:36 AM ---I can't see the pic but wouldn't the air just take the easiest route and go out of the port rather than open the ball valve though?

Nick

--- End quote ---

In this type of valve the piston coming up compresses the air slightly which moves the valve piston and so opens the valve, the trick would be to have an exhaust valve that opened at less pressure than it takes to move the valve piston. :scratch:

Bogstandard:
John,

I don't think you realise how fickle and low powered these types of engines are, just farting near them will stop some of them dead.

Jan does do plans like your original concept of the swing bar at the back, but like I said with mine, he uses two burners on the outside as well.

http://heetgasmodelbouw.ridders.nu/Webpaginas/pagina_happer_inw_schuif_2cilinder/inw_schuif_frameset.htm


John

John Hill:

--- Quote from: bogstandard on September 16, 2010, 06:18:03 PM ---John,

I don't think you realise how fickle and low powered these types of engines are, just farting near them will stop some of them dead.

Jan does do plans like your original concept of the swing bar at the back, but like I said with mine, he uses two burners on the outside as well.

http://heetgasmodelbouw.ridders.nu/Webpaginas/pagina_happer_inw_schuif_2cilinder/inw_schuif_frameset.htm


John

--- End quote ---

Frankly John I am suprised that any can run at all and some run really fast! :scratch:

I have had enough comments to make me think maybe I should leave these well enough alone, but then on the other hand! :med:

My biggest challenge at this time is still working to very small sizes but if I try to make a bigger one I will need a Primus or small nuclear reactor to make it run.... :beer:

NickG:
John,

Having built one of these also I have to agree with Bogs - this particular design is extremely fickle! Not wishing to put you off, I think it's a good idea and I have seen some flame lickers which have such a valve to release pressure as the piston nears TDC, but those were engines that had the valve driven by a cam.

In this one, as you rightly say it's opened partially by pressure on this one but that pressure is a tiny tiny pressure, due to the necessary low friction of the system it opens as soon as the pressure rises above atmospheric - remember there is no spring holding the valve shut, and there can't be one otherwise it won't be open long enough to draw in the hot gas.

I ran mine again the other day for the first time in ages and every time I am surprised how critical flame position and steadiness is. To give you an idea, 1mm in flame position can mean the difference between doing a few hundred RPM and not running at all, somebody moving in the room or opening a door can disturb the flame enough to stop the engine - they are a nightmare to get running but a joy to watch once they are!

Nick

Bogstandard:
John,

I have seen larger versions of these engines made, about the same size as a small compressor pump (and vertical), about 12" high, and they seem less prone to the variations encountered with the smaller ones, as the wick was in like a long groove sitting directly under the horizontal inlet. Jan also does a vertical one that I think might take well to scaling up. If you don't want to go thru Jan, I have a copy of his free plans.

Even the commercial ones had very little power, a big engine to drive one sewing machine. So they were lost as prime candidates as a power source very early on.


John

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