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Uncle Tom's Coffee Cup Engine

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sbwhart:
I've just built a similar engine loosely using the plans on John Tom, they are a bit temperamental to say the least, they have to run perfectly free no tight spots, I made mine with a CD fly wheel, a brass cylinder and a ally piston, I would like to use a glass cylinder and a graphite piston but I can't find a supply of glass tube with an accurate bore(no ovality and parallel). Making the displacer piston was a bit of a challenge I used polystyrene loft insulation I turned it up by making a wooden face place and sticking the piston to it with two way tape.

I used 3/8" thick ally for the top, cold plate: and 1/8" copper thinned down in the middle to 1/6" for the bottom, hot plate, these have to be sealed to the displacer cylinder I used gasket card held in place with Hematite blue.

http://www.youtube.com/watch?v=VOWRpk_17TA

<iframe width="560" height="315" src="//www.youtube.com/embed/VOWRpk_17TA" frameborder="0" allowfullscreen></iframe>

It will run for about 20min on one cup of tea,:- milk no sugar  :Jester:

Stew

mklotz:

--- Quote --- these have to be sealed to the displacer cylinder I used gasket card held in place with Hematite blue.

--- End quote ---

Remember these are extremely low pressure engines.  I "sealed" my plates to the perspex displacer chamber with a thin coat of Vaseline.  The engine is many years old and still performs perfectly.

sbwhart:
Hi Marv

I did toy with the idea of using that method but I have a tendency to over engineer/complicate things, its just my way, but it good to know that it works next time I strip it down to tinker I'll use that method.

Cheers

Stew

Ian S C:
Stew, I don't know what the story is in UK, but those who are in the USA can send an E-mail to the Airpot coy. and get a free sample of glass cylinder, and graphite piston.
         My LTD motor has the top and bottom made from the base of two aluminium fry pans, the  Larger of the two I cut a ring from, that forms the rim of the fly wheel, this is attached to the hub with six spokes made from bike spokes. The cast iron power piston runs in a cast iron cylinder.   Must get it going again.     Ian S C

fcheslop:
For decent glass tubing in the UK try Pyrex it tends to vary slightly in dia from tube to tube but is true and round or at least good enough for a Laminar style engine.
cheers

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