Huff & Puff

[Doc]

Well I picked my next engine build.

[Ye-Ole Steam Dude]

Hello Doc,

This will be an interesting build to follow.

Have a great day,
Thomas

[Jasonb]

I hope you will have enough puff

[b.lindsey]

I love it Doc. Great project for small lathe and mill as well. Where are the plans available for it? One of the Duclos books from Vintage Press?

Bill

[mklotz]

Some inspiration for you.  This is one of my most popular models.  At the grade school presentations I do I let the kids power the engine and they love it.  While walking around engine shows, pull it out of your shirt pocket and impress the guys building stuff with valves bigger than your engine.

I suggest you make a longer blowpipe (mine is six inches) so you can see the engine operating when blowing it yourself.  I've never found an oil light enough and so lubricate it with kerosene which, upon evaporation, leaves behind the mere hint of an oily surface.  (Old timers lubricated their pocket watches by putting a drop of kero on the inside of the back cover.)

Don't forget to add the power takeoff pulley as I did on mine.  I've led several people down the path convincing them that I actually power miniature machines with that pulley. :-)

[kvom]

George will be along to shrink it any minute.   

[Roger B]

Excellent Marv, are the drawings available?

[Doc]

They are available here.
Shop Wisdom Of Philip Duclos

[Doc]

Well here is what I have so far today
I have the cylinder done and the cylinder head.
Also got a goo start on the base.

[b.lindsey]

Nice start Doc. I take it you are making two of them.

Bill

[yogi]

Very cool Doc!
I'm looking forward to see it come together. 

[Doc]

Yes making 2 and am not going to use the NC for any of it. I need to brush up on my manual skills. LOL
Just wanted to try and make it through this build and do it only on the lathe and conventional mill. So far so good on that account. One I am going to try and make a cylinder with a weighted piston that you can pull up and gravity and the weighted piston will supply the air. That one will go to my Father in law at 97 I don't think I want him trying to blow hard enough to run it. LOL Anyway thats the plan right now.

[crueby]

Cool idea for the gravity 'boiler' on one!


 

[gbritnell]

I've seen quite a few oscillators that size but I don't think I've seen a valved engine that small. Nice work so far Doc.
gbritnell

[jadge]

Looking great, but not what I was expecting! To me huff and puff is a technique for stabilising an LC oscillator to give close to phase locked loop (PLL) performance without the complexity. It was invented by a Dutch amateur radio enthusiast in the 1970s. Of course that was long before digital PLLs became available on a single chip.

Andrew