Craftsman: Gerald Smith
Knapp Collection #: 301
Catalog #: 2011.35.8
Contributor: Paul Knapp
The Skylark 2-cycle marine engine was designed and built by Gerald Smith, of the UK. Mr. Smith manufactured over 300 engines from 1922 to the mid-1980s.
Craftsman: Doug Parker
Knapp Collection #: 404
Catalog #: 2016.8.7
Contributor: Paul Knapp
The “Slipper” Cox .049 tether car measures about 7-inches long with a wheelbase of 4-inches. It was hand crafted from billet 6061 aluminum and steel.
Craftsman: Ramon Hoagland
Knapp Collection #: 691
Catalog #: 2022.8.2
Contributor: Paul Knapp
This Snow gas pumping engine was built by Ramon Hoagland. The original engine was designed by Doug Kelley.
Craftsman: Col. James Sorrel
Knapp Collection #: 275
Catalog #: 2011.27.40
Contributor: Paul Knapp
Col. James Sorrel utilized commercial piston and cylinder assemblies to produce his custom-built 2-cylinder racing engines.
Craftsman: Doug Parker
Knapp Collection #: 606
Catalog #: 2019.33.6
Contributor: Paul Knapp
This “Sports Racer” tether car measures 7-7/8-inches long, 2-3/4-inches wide, 2-1/2-inches high, and weighs 19 ounces.
Craftsman: Roy E. McAdams
Knapp Collection #: 208
Catalog #: 2008.16.50
Contributor: Paul Knapp
Roy McAdams offered the Springfield A.1 engine (circa 1919) in kit form or completely assembled and ready to run.
Craftsman: Doug Parker
Knapp Collection #: 414
Catalog #: 2016.8.10
Contributor: Paul Knapp
The “Sprinter” Cox .049 tether car measures about 3-1/4″-wide and 7-1/4″-long with a 4-3/4″ wheelbase. It weighs 13.8 ounces.
Craftsman: American Edelstaal
Knapp Collection #: 298
Catalog #: 2011.27.46
Contributor: Paul Knapp
American Edelstaal provided beginner’s kits like this steam powered pickup truck model, which is about 4.5-inches long.
Craftsman: Gary Conley
Knapp Collection #: 290
Catalog #: 2011.32.10
Contributor: Paul Knapp
This “Stinger 609″ supercharged V8 engine is about 10″-tall. The bore is 1.00″ with a .970” stroke. The engine even has a user replaceable oil filter.
Craftsman: Roger Butzen
Knapp Collection #: 765
Catalog #: 2024.5.11
Contributor: Paul Knapp
This polished Stirling hot air engine was built by Roger Butzen.
Craftsman: George Luhrs
Knapp Collection #: 109
Catalog #: 2008.10.30
Contributor: Paul Knapp
This miniature Stover was machined from bar stock and utilizes no castings. The engine is 5″-long, 3″-wide, and 4″-high.
Craftsman: Roger Butzen
Knapp Collection #: 766
Catalog #: 2024.5.12
Contributor: Paul Knapp
This Stuart single-cylinder steam engine was built by Roger Butzen.
Craftsman: Larry Jenno
Knapp Collection #: 222
Catalog #: 2009.9.32
Contributor: Paul Knapp
This Super Cyclone 60 model airplane engine is in the original box. It was reproduced by Larry Jenno of Nevada.
Craftsman: Robert Lester
Knapp Collection #: 453
Catalog #: 2016.8.29
Contributor: Paul Knapp
The “Super Cyclone” wooden tether boat is powered by a 1940 style Super Cyclone 60. The boat measures 8″-wide, 6-1/2″-tall, 32″-long, and weighs 3.5 pounds.
Craftsman: Scott Motors, Inc.
Knapp Collection #: 121
Catalog #: 2008.16.18
Contributor: Paul Knapp
In 1946, the Thunderbird was advertised as the only miniature engine with a genuine supercharger. The engine is 6”-long, 3”-wide, and 6”-high.
Craftsman: James Weber
Knapp Collection #: 168
Catalog #: 2008.16.25
Contributor: Paul Knapp
Closely resembling the Chrysler 300 Hemi, this 1/3 scale model has a 1-inch bore and .900-inch stroke for a total displacement of 5.65 cubic inches.
Craftsman: Wally Warner
Knapp Collection #: 184
Catalog #: 2009.9.26
Contributor: Paul Knapp
This prototype marked the beginning of a new line of 1/4 scale engines to power large model aircraft. The engine is about 13″ in diameter with a bore of 1.100″ and a stroke of 1.00″.
Craftsman: Technopower Engines
Knapp Collection #: 170
Catalog #: 2011.27.13
Contributor: Paul Knapp
This Technopower 7-cylinder radial engine (SN B7-151) is 7″-long, 8″-wide, 7″-high, and weighs 2 lbs. 8 oz.
Craftsman: John V. Thompson
Knapp Collection #: 146
Catalog #: 2008.10.44
Contributor: Paul Knapp
“9-engine” is not a typo. This engine consists of nine individual Cox .049 1-cylinder model airplane engines geared together in an aluminum crankcase.
Craftsman: John V. Thompson
Knapp Collection #: 147
Catalog #: 2008.10.45
Contributor: Paul Knapp
John Thompson used the cylinder assemblies from Honda weed-eater engines to produce this flat four aero engine. His custom crankcase holds the oil for lubrication and the engine runs gasoline with spark ignition.
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