Powerhouse Stationary Engine
Craftsman: Michael Gombert
Knapp Collection #: 530
Catalog #: 2017.27.5
Contributor: Paul Knapp
This Powerhouse stationary engine was designed by Jerry Howell and built by Michael Gombert. Mr. Howell provided the plans and Mike machined it from aluminum and steel bar stock.
Pratt & Whitney 28-Cylinder 4-Row Radial Engine
Craftsman: Dennis Fadden
Knapp Collection #: 344
Catalog #: 2012.33.17
Contributor: Paul Knapp
This Pratt & Whitney 28-cylinder 4-row radial engine is 17”-long, 17”-wide, and 17”-high. It was designed to operate on gasoline and spark ignition, and sports a 12-inch, 3-blade adjustable pitch propeller.
Profi “DOHC 50” 4-Cylinder Inline Racing Engine
Craftsman: Profi M. E.
Knapp Collection #: 237
Catalog #: 2011.27.20
Contributor: Paul Knapp
This 50cc engine burns methanol on glow ignition and sports a pressure lubrication system. It measures 10″-long, 6″-wide, 6″-high, and weighs 2 lbs.
Profi Water-Cooled V-Twin Engine Display
Craftsman: Dr. Bob Kradjian; Profi M. E.
Knapp Collection #: 575
Catalog #: 2019.10.3
Contributor: Paul Knapp
This Profi water-cooled V-twin engine display was put together by Dr. Bob Kradjian. It’s an early water-cooled Profi V-twin (circa 2000) that burns methanol on glow ignition.
Quatrocycle Made From Watch Parts
Craftsman: Dmitriy Khristenko
Knapp Collection #: 332
Catalog #: 2012.33.7
Contributor: Paul Knapp
Dmitriy Khristenko recycles parts from old wrist watches, pocket watches and eyeglasses to produce miniature motorcycles, quads, bicycles and tricycles.
R/C Model Steamboat
Craftsman: Roger Butzen
Knapp Collection #: 761
Catalog #: 2024.5.7
Contributor: Paul Knapp
This R/C model steamboat was built by Roger Butzen of Texas.
Racing Thunderbird Model Airplane Engine
Craftsman: Scott Motors, Inc.
Knapp Collection #: 142
Catalog #: 2008.16.22
Contributor: Paul Knapp
A Racing Thunderbird (Hayward-Connelly) engine, manufactured by Scott Motors, Inc. The engine is 5”-long, 4”-wide, and 6”-high.
Rat Rod Tether Truck
Craftsman: Doug Parker
Knapp Collection #: 495
Catalog #: 2016.47.1
Contributor: Paul Knapp
The Rat Rod tether truck measures 7-3/4″-long, 2-5/8″-high, and 3″-wide at the rear tires. It was machined from aluminum and steel bar stock.
RCS 400 5-Cylinder Radial Airplane Engine
Craftsman: Moki, Inc.
Knapp Collection #: 201
Catalog #: 2008.16.43
Contributor: Paul Knapp
This RCS 400cc radial burns a gasoline/oil mixture on spark ignition. The unique electronic ignition utilizes a miniature high tension coil located at each spark plug.
RCV 60 Sleeve Valve Cutaway Engine
Craftsman: RCV Engines
Knapp Collection #: 271
Catalog #: 2011.27.39
Contributor: Paul Knapp
This RCV 60 sleeve valve cutaway engine was designed and built by RCV Engines. The cylinder liner rotates one time for every four strokes of the crankshaft.
Red Wing Stationary Engine
Craftsman: Harold Beckett
Knapp Collection #: 64
Catalog #: 2009.9.07
Contributor: Paul Knapp
Harold Beckett built this 1/4 scale model Red Wing stationary engine from a casting kit in the mid-1990s. It has a bore of 1.125″, a 2″ stroke and burns gasoline on spark ignition.
Rider Ericsson Hot Air Engine
Craftsman: Roger Butzen
Knapp Collection #: 754
Catalog #: 2024.5.1
Contributor: Paul Knapp
This Rider Ericsson hot air engine was built by Roger Butzen of Texas.
Riggle 1/4 Scale Midget Race Car
Craftsman: Jim Riggle
Knapp Collection #: 238
Catalog #: 2011.27.21
Contributor: Paul Knapp
This 1/4 scale Riggle midget race car was designed and built by Jim Riggle. Jim made the patterns and molds for the 4-cylinder, water-cooled, DOHC mono-block engine.
Riggle 4-Cylinder Inline Engine
Craftsman: Jim Riggle
Knapp Collection #: 695
Catalog #: 2022.8.6
Contributor: Paul Knapp
This Riggle 4-cylinder inline engine is 9.5″-long, 7″-wide, 7.5″-inches tall, and is mounted on a running stand that houses all necessary accessories to run and monitor the engine.
Riggle NOVI DOHC 1/4 Scale Sprint Car
Craftsman: Jim Riggle
Knapp Collection #: 300
Catalog #: 2011.32.14
Contributor: Paul Knapp
This 1/4 scale Novi V8 sprint car was designed and built by Jim Riggle, of North Dakota, in the mid-1980s. The model car is 37″-long, 16″-wide, and 12″-high. Jim used this sprint car as the test platform for his new model of the NOVI V8 engine.
Rimfire Spark Plug Prototypes
Craftsman: Paul Knapp
Knapp Collection #: 296
Catalog #: 2011.27.44
Contributor: Paul Knapp
These Rimfire spark plug prototypes were built by Paul Knapp in 1993. The first prototype is the surface-gap plug responsible for the “Rimfire” name and logo.
Robarts R780 7-Cylinder Radial Engine
Craftsman: Bob Walker
Knapp Collection #: 13
Catalog #: 2011.27.3
Contributor: Paul Knapp
This Robarts R780 7-cylinder radial engine has a bore of 1.125 inches and stroke of 1.125 inches for a total displacement of 7.8 cubic inches.
Ross 2-Cylinder, 2-Cycle Target Drone Engine
Craftsman: Lou Ross
Knapp Collection #: 196
Catalog #: 2008.16.39
Contributor: Paul Knapp
Lou Ross designed and developed this large 3.5 cubic inch opposed twin for possible use as a target drone engine for military applications.
Ross 4-Cylinder, 2-Cycle Target Drone Engine
Craftsman: Lou Ross
Knapp Collection #: 197
Catalog #: 2008.16.40
Contributor: Paul Knapp
This is a 7.0 cubic inch opposed four-cylinder, two-cycle engine designed to power a target drone. It burns methanol on glow ignition.
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