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How much for the SPI co=ax indicator?

Running. Seems it likes about 240 RPM with that amount of heat. I haven't tried messing with displacer timing to see if small changes will change the speed.

Completed engine, left and right sides.

I had a nice piece of aluminum to machine the finned cooler out of and it was much larger diameter than the drawing so I made it 2-5/8 rather than 2-7/32". I figured a little more cooling wouldn't hurt and I hated to see it go away as chips.

Original design called for round spaces under the main bearings, I choose to replace them with a solid brass block. I thought about drilling the block to give it a better look but have not done so yet. I also replaced the round spacers under the cylinder base plate as well.

I wasn't pleased with the original design using 2-56 flat head screww holding the cylinder base plate on so I added 2 each 5-40 allen headed screws and it felt much more stout.

Machining one con-rod.

Forced to take time to replace some injectors in my pickup so machining has slowed to a stop. I should be back at in a few days.

As stated in the "General Engine Discussion" I started building Cole's Hot Air Betsy from prints that I received from them a long time ago. Life sort of got in the way and I just recently came upon some of the completed parts and eventually found the prints. After lurking around the forum for...

Well, I guess I'll start a build thread in the "A work in progress" for the Hot Air Betsy. I'm really new to this forum posting so we'll see how it goes.

I don't know about everybody else but I do my best thinking when I should be sleeping at night... I may just make the cylinder base out of one piece of brass and make it 1/2" thick negating the need for standoffs, I'll have to see what I have for materials. I'm still wondering if there may be...

Thanks Dave. Since I don't have the castings I have looked at changing the design of the cylinder base as I don't like the stand offs either. I just finished roughing out the cylinder base, I may make a spacer the same size as the cylinder base instead of the stand offs. The only thing that...

was digging through my tool box the other day and found parts I had started in making Sterling engine from a set of two prints from Cole's for the Hot Air Betsy. Then as luck wood have it there was the set of prints for that engine, it was karma. Now I'm back on the road to manufacturing the...

Hi to all from central Wyoming. Have made a couple small engines, one the Cole's Economy from casting kit, another Stuart from some od castings my uncle had and I am presently building a Sterling engine from scratch. Looking forward to interacting with the group and learning lots of intersting...