Boxer 2-Cylinder Opposed Aircraft Engine
Craftsman: Unknown
Knapp Collection #: 154
Catalog #: 2008.16.23
Contributor: Paul Knapp
The maker of this Boxer 2-cylinder opposed aircraft engine is unknown, but it came from Germany. The engine is 9”-long, 9”-wide, and 7”-high.
British MK IV Battle Tank
Craftsman: Stephen J. King
Knapp Collection #: 243
Catalog #: 2011.27.24
Contributor: Paul Knapp
This 1/16 scale model British MK IV battle tank was built from 1/16 steel sheet, and over 1,200 steel rivets were made and set by hand.
Brodbeck Side Port .60 Tether Car Engines
Craftsman: John Brodbeck
Knapp Collection #: 638, 639, 640
Catalog #: 2021.9.1
Contributor: Paul Knapp
These Brodbeck side port .60 tether car engines are presumed to have been built by John Brodbeck in the mid-1940s.
Bruce Macbeth Inline Four Engine
Craftsman: Ramon Hoagland
Knapp Collection #: 740
Catalog #: 2023.2.6
Contributor: Paul Knapp
This Bruce Macbeth inline four engine is 13.5″-long, 12″-wide, 11″-high, and weighs about 20 lbs.
BUSTER K&B Powered Model Airplane
Craftsman: K&B Manufacturing; Premium Manufacturing
Knapp Collection #: 616-2
Catalog #: 2019.33.14
Contributor: Paul Knapp
A special version of the Torpedo Jr. was created for a promotional model airplane produced for the LA Times Newspaper, circa 1951.
Challenger Flathead V8
Craftsman: Ron Bement
Knapp Collection #: 496
Catalog #: 2016.44.7
Contributor: Paul Knapp
This Challenger flathead V8 was custom built by Ron Bement. Ron’s version includes several innovations and modifications not found in conventional Challenger engines.
Challenger Flathead V8
Craftsman: Dick Pretel
Knapp Collection #: 589
Catalog #: 2019.11.2
Contributor: Paul Knapp
The only part of this engine typical of the Challenger V8 is the crankcase; everything else was machined from 7075 aluminum, steel, and stainless steel bar stock.
Challenger Flathead V8
Craftsman: Ed Miller, Mike Gombert
Knapp Collection #: 593
Catalog #: 2019.11.6
Contributor: Paul Knapp
This Challenger flathead V8 engine was built by Ed Miller (WY) and Mike Gombert (CO). Typical of Ed’s engines, this Challenger is designed to burn methanol on spark ignition.
Challenger V8 Prototype Engine
Craftsman: Bachtold, Thoms, and Dettrick
Knapp Collection #: 08
Catalog #: 2011.27.1
Contributor: Paul Knapp
This Challenger V8 prototype engine is 12″-long, 12″-wide, 14″-high, and weighs 25 lbs. The engine was finished in the mid-1960s.
Cirrus 4-Cylinder Inline Aero Engine
Craftsman: Merritt Zimmerman
Knapp Collection #: 34
Catalog #: 2008.10.9
Contributor: Paul Knapp
Merritt Zimmerman produced his own castings to build 75 of these 1/6-scale Cirrus engines (glow ignition).
Cirrus 4-Cylinder Inline Aero Engine
Craftsman: Merritt Zimmerman
Knapp Collection #: 10
Catalog #: 2008.10.4
Contributor: Paul Knapp
1/4 scale model built by Merritt Zimmerman, circa 1989, L=19″, W=8″, H=10″
Cirrus 4-Cylinder Water-Cooled Inline Model Airplane Engine
Craftsman: Merritt Zimmerman
Knapp Collection #: 35
Catalog #: 2009.9.02
Contributor: Paul Knapp
Merritt Zimmerman produced his own castings to build (75) 1/6 scale Cirrus engines (glow ignition) between about 1980 and 1994.
Clarke 1-Cylinder Trolling Boat Motor
Craftsman: Profi M. E.
Knapp Collection #: 91
Catalog #: 2008.10.27
Contributor: Paul Knapp
A 1/3 scale Clarke 1-cylinder trolling boat motor. The propeller is mounted directly to the crankshaft and the entire engine is submerged under water for cooling.
Clarke 2-Cylinder Trolling Boat Motor
Craftsman: Profi M. E.
Knapp Collection #: 92
Catalog #: 2008.10.28
Contributor: Paul Knapp
Like the 1/3 scale Clarke 1-cylinder engine, the full-size version of this motor, a Clarke 2-cylinder, was originally manufactured in Michigan in the 1930s. It operates in the same manner, with the entire motor operating underwater to keep it cool while air is ducted down through the cast case.
Coholic 3-Cylinder Radial Engine
Craftsman: Andrew Coholic
Knapp Collection #: 37
Catalog #: 2008.16.05
Contributor: Paul Knapp
Andrew Coholic designed and built this tiny 2-cycle radial engine by mounting three Cox .049 engines into a common crankcase. The engines are geared together with a common propeller shaft.
Conley “427” V8
Craftsman: Gary Conley
Knapp Collection #: 315
Catalog #: 2011.35.10
Contributor: Paul Knapp
In 1988-89, Gary Conley fabricated the molds and patterns to produce a casting kit for this 4.27 cubic inch V8 and made it available in several variations.
Conley Small-Block V8 Engine
Craftsman: Paul Knapp
Knapp Collection #: 07
Catalog #: 2008.10.3
Contributor: Paul Knapp
A methanol-burning supercharged small-block V8.
Conley V8 Engine
Craftsman: Gary Conley
Knapp Collection #: 48
Catalog #: 2008.10.14
Contributor: Paul Knapp
Gary Conley built several machined V8 engines. In 1988-89, he fabricated the molds and patterns to produce a casting kit for his V8.
Continental C-85 Opposed Aircraft Engine
Craftsman: Dennis Fadden
Knapp Collection #: 54
Catalog #: 2008.16.08
Contributor: Paul Knapp
Dennis Fadden’s 1/4 scale Continental C-85 is a “true-to-scale” model of the full-size version that was commonly used in light aircraft during the post-World War II period—most notably in the Piper Cub.
Showing 20 of 375 exhibits.