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It occurs to me that if the inner channels are grooves instead of holes, my idea won't work.

Hi Brian, I joined the forum so I could watch your builds. I had emailed you a couple of times before that. I have no machining experience to speak of...

[brian Rupnow]

Two 25 tooth gear blanks turned and that's all she wrote for today. O.D. and hubs are turned to size from 1144 stress proof steel. Center hole has been...

[brian Rupnow]

Just finished the big three hour "clean-up, slick-up, put all my tools away in the correct place" dance. I try and put my tools away as I use...

[brian Rupnow]

RB211 ---All of those men were giants. At the beginning of the 1800's, when nobody had done these things before, they did the equivalent of the moon...

[brian Rupnow]

Dr Mike- I'm sorry if I rattled your chain a bit.--No foul intended. I build a lot, and I post a lot, and there are some people who enjoy jumping on me...

[brian Rupnow]

Doctor Mike--You have it right. Most of my 40 engines "look like something visually but aren't technically the same". I have no shame in doing...

[brian Rupnow]

Boys, we're going to start down a new path today. I'm very disappointed that I didn't get this engine to run with the 4 way valve and I really, truly...

[brian Rupnow]

John--I don't really know. In all of the research I have done on this engine, I have only seen two successful models, one made in Atlanta Georgia one...

[brian Rupnow]

Sparky--It has a 3/4" diameter piston. At 60 psi the piston generates 26.5 pounds of linear force.

[brian Rupnow]

I've tried all of the tricks in the "Rupnow Magic Hat" and I am not able to get this thing to run using the 4 way valve. It is one of those...

[brian Rupnow]

https://www.youtube.com/watch?v=Wco5RXN3cXc
This is my Trevithick engine doing something I haven't seen before. It has a unique 4 way valve mounted...

[brian Rupnow]

No, yesterday I did make a much heavier plain plate flywheel, and although it helps it's not quite there yet. This morning I frigged around with different...

[brian Rupnow]

Bah!! Humbug!!--The easy fix (repositioning the valve actuators) didn't work. I have never had an engine so close to running that didn't actually take...

[brian Rupnow]

After a full day of fixing disconnected tubing and taking things apart and then putting the parts all back together again, it was time for some analysis...

[brian Rupnow]

Sparky--I know there is a hobby shop in Barrie. I go there every time I'm out and about looking for parts. I go to Ideal Hobbies, Busybee Tools, Princess...

[brian Rupnow]

Sparky--I know that the world is full of incredibly innovative and useful stuff. However, when I need something I need it right now. Not 3 day shipping,...

[brian Rupnow]

It looks neat Sid, but what is it and what does it do?---Brian

[brian Rupnow]

I learned three new things today. #1--There is a type of crazy glue that doesn't dry instantly--it gives you about 15 seconds between when it is applied...

[brian Rupnow]

-Big changes with the heavier flywheel. The flywheel is rocking back and forth like crazy between top dead center and bottom dead center under air pressure....