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model steam engine: Comments on the design I have in mind?

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bogstandard:
Jon,


--- Quote ---So when its returning to the bottom of the stroke
--- End quote ---

I was getting slightly confused, then realised you had made a slight mistake, actually, when the piston is moving towards the head, it is classed as moving to the top of it's stroke.

So now, as the piston is going towards the top of its stroke, there should be an exhaust valve in the head to relieve the pressure of the air being compressed on top of the piston. When it reaches TDC, the exhaust is then closed and the inlet fires, forcing the piston to the bottom of it's stroke. The cycle then repeats.

John

jonogt:
I see what you're saying John, thanks for the terminology correction.  If it's not yet obvious, I have very little experience with engines.  I understand in general how they convert heat/chemical energy to movement, but a lot of the details about how all the parts physically function to make the whole system work right are new to me.  The oscillating engine makes perfect sense to me now, but I like the locomotive style a lot more.  Do you guys think I should atleast do a successful rough draft oscillator before trying the locomotive one?

We'll be doing milling and lathe work in the next couple weeks in my manufacturing processes lab, so I should be a bit more with the program after that.  Today we did basic stick, MIG, and TIG welding... MIG is the only of these I'd done before.  I've been interested in building a stick welder out of microwave transformers (lots of talk online about it), but after actually using one I'm definately over the idea  :bang:.  TIG was excellent and sophisticated... my unrivaled favorite now.

well I'm gonna quit ranting now... if anyone has an opinion about if I should build an oscillator before trying a locomotive, your 2 cents is welcome

-Jon

jonogt:


^new design possibility i'm considering.  what do you guys think?  let me know if the drawing isnt enough to follow the idea, but it should be (this isnt exactly a group of dimwits here  :smart: )

bogstandard:
John,

Yes, it is very easy to follow you design, but all I ever seem to do is shoot you down in flames, and that is one thing I don't really want to do because it might discourage you from carrying on designing your own.

I saw this on another site, and I thought it would be a good thing for you to see.


--- Quote ---Don't try to be as good as the people here. Try to be as good as YOU can, and use the folks here for inspiration.
--- End quote ---

I have been making my own designed enginres for a long time, and I have no qualms about using another persons idea to achieve the results I want. Whatever you can come up with, I can almost guarantee someone has tried it before
This is the post where I built the engine above, and as you can see by going down the page a bit, Chuck gave me some very good pointers, and I used it to design my own system. The one shown would work perfectly for your engine.

http://www.homemodelenginemachinist.com/index.php?topic=612.0

The major problem with you system would be trying to seal it. You would also only need one hole in the shuttle plate, and using a cam on the crank, you would be able to align that hole for the correct durations.

John

sbwhart:
Hi Jon

Thanks for asking the engine questions,

It' led to a very interesting and informative answer from John, I've never thought about poppet engine, and a found Johns link exsteamly interesting.

Thank you and Keep the question coming

Cheers
 :wave:
Stew

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