Schindele Walking Beam Stirling Engine
Craftsman: Ron Schindele
Knapp Collection #: 565
Catalog #: 2019.9.5
Contributor: Paul Knapp
As a fill-in project, Ron Schindele turned to this little walking beam Stirling engine that was available as a bar-stock kit from the Grizzly Machine Company.
Schroeder Display of Multi-Cylinder Cox Engines
Craftsman: Roger Schroeder
Knapp Collection #: 377, 378, 379, 380
Catalog #: 2013.53.7
Contributor: Paul Knapp
Mr. Schroeder was well known for his innovative multi-cylinder engines that utilized Cox .020 and .049 engine parts.
Seidel 770 Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 15
Catalog #: 2022.8.1
Contributor: Paul Knapp
This Seidel ST770 engine is a 7-cylinder 70cc (4.17 cubic inch) radial engine with a speed range or 1,000 to 6,000 revolutions per minute (rpm), using a 26-10 propeller.
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 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.
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 OHC Air-Cooled Demonstration Engine
Craftsman: ELWE Educational Products
Knapp Collection #: 347
Catalog #: 2013.53.1
Contributor: Paul Knapp
This. single-cylinder OHC air-cooled demonstration engine was made in Germany in the 1990s. The engine is 8”-long, 16”-wide, 8”-high, and weighs 8 oz.
Single-Cylinder, 4-Cycle Air-Cooled Engine
Craftsman: Unknown
Knapp Collection #: 285
Catalog #: 2011.27.41
Contributor: Paul Knapp
This model engine was almost completely machined from aluminum and steel bar stock. The cylinder is a modified 2-cycle cylinder that was converted to operate on this 4-cycle engine.
Single-Cylinder, 4-Cycle Model Airplane Engine
Craftsman: Unknown
Knapp Collection #: 210
Catalog #: 2011.27.17
Contributor: Paul Knapp
This single-cylinder, 4-cycle model airplane engine has a 3/4-inch bore, a 1.0-inch stroke, and it burns methanol on glow ignition.
Single-Cylinder, Air-Cooled, Four-Cycle OHV Engine
Craftsman: Unknown
Knapp Collection #: 174
Catalog #: 2008.16.27
Contributor: Paul Knapp
The most striking features of this engine are the complexity of the carburetor, and the use of only one threaded stud to mount both the intake and exhaust manifold.
Sir William Horizontal Twin Pumping Engine
Craftsman: Ramon Hoagland
Knapp Collection #: 665
Catalog #: 2021.9.3
Contributor: Paul Knapp
This Sir William horizontal twin pumping engine was made by Ramon Hoagland of Colorado.
SJ-10 Turbojet Engine
Craftsman: Mike Early
Knapp Collection #: 588
Catalog #: 2019.11.1
Contributor: Paul Knapp
This SJ-10 Turbojet engine was made from a turbocharger with a combustion system added and it runs on propane. Mike provided plans to jet engine enthusiasts worldwide.
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