Hot Air Engine
(Size- 8 Inch Bore)
This is one of those
waiting for a ton of inspiration to complete. Start with one 8"
Rider-Ericsson base, water pump and cylinder and go make the rest...
I got this one from a friend about 5 years ago and it needed,
as you can see, a lot of parts. I tried calling all over the country
trying to find parts...nada...zip...goose egg! I am lucky that
I have the really critical parts to complete this engine, good
woodworking/patternmaking skills, and a foundry about an hour
away. So over the 2001 holidays I will try to make most of them. The
engine came from SE PA .
The cylinder is in excellent shape ! Some
light surface rust, a little crud in the water jacket and the
water pump needs new leather seals. First thing to make is a flywheel
I have a lot of photos and a set of quarter
scale model drawings. I was able to locate the points and radaii
to get the nice spoke shape. The cardboard template is used to
get exact copies of all 4 pieces. The center spokes are two thicknesses
of 1/2 plywood with radiussed edges. The outer rims are 3/4 plywood.
The pattern will be split into 2 mirror-image halves to go into
the cope and drag. This still needs more work but I was really
jazzed to get this done and I am pleased with the look. I still
need to make the center hubs, pin the halves and put the draft
in it. Some thin masonite will make the raised rim OD area and
get the proper dimensions. Bondo will be used to develop all the
Fixture I made to use the router to true
up the OD and develop the draft angle needed to get the pattern
out of the sand. Getting the center hubs on correctly was critical
to having both draft angles meet along the parting line. Now just
lots of rasping and sanding to get the spokes shaped correctly.
Patterns for the beam pivot (blue modelling
wax) , the rocking beam, and the flywheel bearing support just
beginning. Time for more filling corners with Bondo which worked
well. The blue rocker support will be split down the center on
a bandsaw, pinned and it ready for the foundry.
Almost finished flywheel pattern.
Just need to final sand and apply polyurethane.
Patterm for flywheel support ~80% done.
Lots of cutting and fitting on the engine cylinder and base to
get it to fit... Buster Brown has helped me out immensely by mailing
pix of his 8" engine which is apart plus communicating critical
dimensions by phone and e-mail.
Walking beam nearing completion. Had to
add side ribs per pictures from Buster. Little more sanding and
filling to do.
Finished Flywheel without machine work
Finished castings from foundry.
The rocker arm support finished.
The piston pattern and finished piston. I made the tower screw into the
piston. I used the DRO on the mill and triged out the coordinates to
get the 10 bolt circle.
Finished piston and tower. Remember- 8" bore; big hunk of iron!
11/13/2003- Well here it is! I had it running last weekend. Still
some odds and ends to do. I have to make a better cart for it and
install water hopper and plumbing; WHEW. All the links are cast brass
like originals. The stove is made from 1/16" Stainless sheet (needs
Picture of the stove. Check out the 15 little bunsen burners which heat
the bottom end. All made from 1/2" stainless tubing . Will post
some final pix by the end of 2003. Some cosmetics with the bolts; have
to put on old style. Hope to do a writeup in GEM. I wish to thank
Buster Brown for his immense help with dimensions on this project;
couldn'a done it without him. Also- George Coates Sr. (stuff which
would not fit in my lathe), Dave Reed (helped me broach the flywheel
and sundry odds and ends) and John Rex for his helping me get pix
of the burner and stove. Thanks guys- this is what makes this hobby so
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