This engine is a model, but that is not to
say it could not power a canoe. This photo shows the engine
with major parts erected; it stands 12 inches
tall (13 inches from bedplate webs to cylinder
top covers) and 12 inches end to end of
shaft. It has a surface condenser and airpump cast itegrally
with its back columns, like the full size
500-1000 hp engine it precisely models. Its dimensions are
HP 1.75, LP 3.00; stroke 2.00; piston valve
HP slide LP. Kit
includes twelve castings, six 24" x
38" fully dimensioned drawings, and a narrative of how to build
the engine by its designer seventy-five years
ago. Price $1150;
This engine is similar in size to the Coventry Compound and the Stuart No. 3 Compound, but it is precisely to perfect scale detail where these other engines were lacking. Drawings of the engine were serialized bi-weekly in The Model Engineer & Electrician(London) March 8 through April 12, 1923. We know not how many were built by individuals but we do know that a patternmaker for the Southern Pacific Railroad's foundry in Portland, Oregon made complete working drawings (India ink on vellum), then patterns in lacquered mahogany. According to the author of the serialized article: "It is modeled after the compound engine type usually installed in coasting steamers of the 13 + 26 x 20 size. At 100 psi, the model's maximum pressure, it is also large enough to actually do 'work.'" Its detail is superior to any other model marine engine produced since the steam age....Cores are used to cast the cylinder block, bedplate, and condenser so that prototype details and functional passageways are retained in the model.
We cannot speak more highly about this engine to the modelbuilder who wishes to build an exact authentic replica of a Victorian era small ship engine. According to Bill Durham who has seen the engine in our shop, "It is for the builder to make a "rare antique" in his very own shop....it would be comparable to museumpiece engines that are so highly valued." Indeed, it is more realistic than the "Firedrake" engine model that was auctioned in 1997. Its patterns--and especially its coreboxes--are so well executed that the sandcastings seem like investment castings. In fact, I had the model on my desk when I worked at Precision Castparts Corp. (the inverstment casting house) where aerospace engineers would argue that it had to be investment cast. It shows the high art of sand casting at its best. These castings have the potential to be no less than exquisite in the hands of an experienced modelbuilder. We will add more photos of it showing progress.
As the "fitting" progresses, more machined parts now waiting in cigar boxes will find their way on the engine; the photo shows the progress of fitting the machined parts: the columns and cylinder block are erected; next step is to dismantle, then fit the main bearings in the boxes and scrape the bearings for the shaft parallel to the guides. Design, pattern drawings, pattern & core making, molding and pouring, machining drawings, machining, fitting...the process is a long one.
Send $20.00 for the STUDY DRAWINGS packet that
includes one-sheet drawings of these engines and hulls, boilers,
propellers, and accessories. You can order via the ORDER FORM
on this website, but unfortunately the drawings simply do not send
well via the Internet; we will send them via US Mail. If you
buy a set of drawings for any engine, and if you later buy the castings, your
cost of the drawings will be deducted.
We hasten to add that we do not recommend
you build your own engine if your immediate goal is to have a steam launch. We
can supply you with a ready-made single cylinder engine for the present
and you and you can upgrade later with one of these.