Seidel Prototype Radial Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 283
Catalog #: 2011.32.5
Contributor: Paul Knapp
This pre-production model, built in the early 1980s, is one of Mr. Seidel’s first prototypes intended to introduce his engines at trade fairs and model airplane shows.
Seidel ST 1426 14-Cylinder Radial Model Aircraft Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 56
Catalog #: 2008.10.16
Contributor: Paul Knapp
The ST 1426 is the largest engine in the series, and perhaps the largest model airplane engine commercially sold.
Seidel ST 525 5-Cylinder Radial Model Airplane Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 70
Catalog #: 2008.10.22
Contributor: Paul Knapp
The Seidel ST 525 radial airplane engine is among the largest 5-cylinder model airplane engines built to date.
Seidel ST 540 5-Cylinder Radial Model Aircraft Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 14
Catalog #: 2008.10.5
Contributor: Paul Knapp
The Seidel ST540 has a speed range of 1,100 to 6,800 revolutions per minute, using a 22-6 propeller.
Seidel ST 726 7-Cylinder Radial Model Aircraft Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 55
Catalog #: 2008.10.15
Contributor: Paul Knapp
The ST 726 weighs approximately 16 pounds. It burns methanol with castor oil mixed in for lubrication, and swings a 32-12 propeller at 4,500 rpm.
Seidel ST 770 7-Cylinder Radial Model Aircraft Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 15
Catalog #: 2008.10.6
Contributor: Paul Knapp
The Seidel ST 770 has a speed range or 1,000 to 6, 000 revolutions per minute (rpm), using a 26-10 propeller.
Seidel ST 996 9-Cylinder Radial Model Aircraft Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 16
Catalog #: 2008.10.7
Contributor: Paul Knapp
The ST 996 9-cylinder 96 cc (5.9 cubic inches) is the largest of three in this series of engines.
Shovelnose Hydro Tether Boat With 2-Cylinder Engine
Craftsman: Unknown
Knapp Collection #: 416
Catalog #: 2016.8.12
Contributor: Paul Knapp
This sleek looking hydro measures 11″-wide, 30.5″-long, and sports a custom built two-cylinder, two-cycle, alternate firing twin with a double throw crank.
Silver Angel Gas Engine
Craftsman: Birk Petersen
Catalog #: 2016.15.49
Donor: Mark Petersen
Birk’s rendition of the single-cylinder “Silver Angel” gas engine designed by Bob Shores.
Silver Angel Hit-N-Miss Engine
Craftsman: Jack Randall
Catalog #: 2018.18.4
Donor: Katherine Randall
This single-cylinder, 4-cycle, air-cooled hit-n-miss engine was built by Jack Randall and designed by Bob Shores.
Silver Angel Hit-or-Miss Engine
Craftsman: Pamela Weiss
Catalog #: 2018.24.1
Contributor: Pamela Weiss
This Silver Angel hit-or-miss engine was built by Pamela Weiss.
Silver Angel Vertical Stationary Engine
Craftsman: Ramon Hoagland
Knapp Collection #: 613
Catalog #: 2019.33.10
Contributor: Paul Knapp
This Silver Angel vertical stationary engine was built by Ramon Hoagland, of Colorado, in 2017.
Silver Dollar Oscillating Steam Engine
Craftsman: Unknown
Catalog #: 2011.4.14
Donor: Les Cade
This “Silver Dollar” oscillating steam engine is unusual in that the flywheel is made from a bicentennial Eisenhower silver dollar.
Silver Dollar Steam Engine
Craftsman: Les Cade
Catalog #: 2012.31.3
Donor: Owen Cade
This Silver Dollar steam engine was originally made to be handheld over a flame for boiling water.
Single-Cylinder .60 Model Airplane Engine
Craftsman: Unknown
Knapp Collection #: 346
Catalog #: 2016.8.3
Contributor: Paul Knapp
This single-cylinder air-cooled .60 size engine was machined from aluminum and steel bar stock and designed to burn methanol on spark ignition.
Single-Cylinder Brass Steam Engine
Craftsman: Les Cade
Catalog #: 2011.4.23
Donor: Les Cade
This single-cylinder brass engine was the first steam project produced by Les Cade.
Single-Cylinder Hit N’ Miss Engine
Craftsman: Unknown Canadian Manual Arts Class
Catalog #: 2011.4.4
Donor: Les Cade
In the 1930s in Canada, this single-cylinder hit n’ miss engine was reportedly built by manual arts students as a class project.
Single-Cylinder Horizontal Gas Hit N’ Miss Engine
Craftsman: Mr. Hallock
Catalog #: 2011.4.5
Donor: Les Cade
This single-cylinder horizontal gas hit n’ miss engine is ungoverned and features a chain driven water pump, model airplane carburetor, and twin cams.
Single-Cylinder Horizontal Steam Engine
Craftsman: William "Scotty" Hewitt
Catalog #: 2008.17.4
Donor: William "Scotty" Hewitt
This miniature single-cylinder steam engine was built by Scotty Hewitt.
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