"Those are some really fine-grained gray iron castings.
I wonder if they are ductile iron?
Sort of a lost-wax process look to them, since the detail is so fine and clear."
yes, the vise castings are lost wax,
1” Jaws Wilton Copy Miniature Baby Bullet Vise By DeVerna, Morrison & Marvin NOS
just sold for
i made the lost wax molds for this bench vise and the model Kurt machine vise :)
i have built 1/10th(.800), 1", 2" and 3" Ericsson models, the 3 larger from Meyers kits.
the key for all hot air models is close fits with no friction. i hone and polish the bore and then fit the pistons with .0005 clearance and no rings.
i used a Farmall A tractor wet sleeve for the 3"...
per your pic, the Phoenix tracks with the flat sprockets thru the grousers give resistance to side sliding.
dozer tracks with the sprockets in the rails(chain) with the grousers bolted on
will "skate" sideways down a frozen hill when traversing.
i'm waiting to see your model, it will be neat...
aluminum cigar covers can be drawn to a smaller diameter by pushing them thru a sizing ring with a wood push stick with a rounded end. i did that to build a 1/10th size Erickson engine with a .800" bore. (back when i still had a dark beard :-)
1/2 size- I measured an original engine, made the patterns and built the engine.
the 1/4 was built by Jon Gingrich by measuring the original engine at Coolspring.
the 1/10th engine was built by Armin Devries in Germany
Wayne Grenning built the 1/14 Otto-Langden in 1991.
my models at Rollag 2021
1/2 size 2 hp Deutz-Otto slide valve flame ignition, runs on hydrogen
1/4 size of a 2 hp Schliecher-Shumm Otto slide valve, runs on acetylene
1/10 size of a 8 hp Deutz, runs on butane-propane camp fuel
1/14 th Otto-Langden