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Here is an 11cc Rhombic drive engine made from an article in Model Engineer Magazine. It turns at 3000+ RPM.

Dennis, Your fan looks great. If you find that it is too aggressive, it may pull the flames out and the burners wont stay lit. You many need to adjust the voltage or damper it down a bit. The idea of the fan for this tractor does not take much draft to keep the flames going in the right...

I have a set of Reico Uni-Flow steam engine castings to sell. These were made in Grafton, Ohio in the 1970's and 1980's. They are no longer available. 1 1/4" bore, 2 1/2" stroke. 7 1/2" dia. flywheel. Overall dimensions 18 1/2 x 11" Aluminum cast base. Cast Iron and brass castings. Cylinder is...

I have a set of Paul Breisch Full size Popcorn Steam engine castings to sell. Aluminum base. Cast iron and brass engine castings. 1 1/2" bore 2 1/2" stroke 8 3/8" dia. flywheel. Governor castings included. Drawings included. Asking $350.00 Doug

I have various parts of engines to get rid of in this lot. There are some Weeden # 14 parts. Stuart Turner Twin Launch. Antique Vertical Steam engine Governor Bar Stock Horizontal frame and cylinder Bar Stock twin vertical launch Two Cylinder casting engine, unknown make Two horizontal engine...

Dennis, More great work. My tractor was a two + year project. Doug

Very nice Dennis. Another thought about my tractor, I placed a double wall inside my firebox area. This has maybe 1/8" insulation between the inside and outside wrappers. This also helped control the heat and helps keep paint on the firebox side sections. Doug

Your boiler looks great Dennis. I knew you would do a good job on it. Can't wait to see the hydro test results amd see it steaming. Doug

Dennis, Everything looks great! My tractor has some wicking material that was available years ago that my contain asbestos. It was put in and run for hours and I've not had to disturb it any at all. The wicking sticks about 1/8" above the burners. I don't recall the size of the flame but I'm...

Another thought. Make sure you are heating the end of the glass tube that is closest to the piston. Heating the far end will not work. Doug

No Problem, I'll get the dimensions for you later this weekend. My bearings I got from the hobby shop, they had a nice selection of bearings for RC car wheels. My engine does have a nice amount of compression. They also suggested putting a screw into the cylinder connector to releave compression...

I made one of these engines and it is a mystery to many. Sometimes it runs quite well and fast, sometimes not so fast. It is hard to find others that know about these engines, and even at model shows you don't see them. Mine ran better after I made sure there was no extra friction anywhere. My...

Thanks Zee. It was a fun quick project.

[img]A recently completed project, as a Christmas gift. Non firing of course.

Another tip. I found at a flea market an old worn out ream with a Morse taper shank that fit into my tail stick. It has a shaft of about 9/16" dia. I cut off the flutes and made die holders and a tap holder with a Jacobs chuck to slide over the round shaft. Any reasonable size would work...

Harry, I too have built the Stuart James Coombes Table engine. As I recall, there were no issues and it is a nice running model. It always draws attention at a show. Doug

Dennis, Your work looks great. Keep the updates coming Doug

Here is a Rhombic drive Stirling. I'll take some video and post too. The hot cap will glow bright orange. Cool end has a water jacket and a water pump to circulate cooling water/ It has been strobed at over 3000 RPM. Lots of fun. Doug

Dennis, Your work looks great! I agree with using graphite yard packing. If it is too large, you can use an Exacto knife to slit it into thinner strips to fit your packing gland. Also, the current issue of Home Shop Machinist has an article about this same tractor. Doug

Very Good Congrats. One more thought. It does not like lots of oil. You may find that you need to take the cylinder head off and the piston out and clean the gummy old oil out every once in a while. These are lots of fun little engiens. Doug