Loyal Cycle Engine
Craftsman: Ron Schindele
Knapp Collection #: 629
Catalog #: 2020.4.2
Contributor: Paul Knapp
This Loyal Cycle engine runs on gasoline vapor or propane with electronic spark ignition, and it has only three moving parts.
Luhrs Mini Single-Cylinder 4-Cycle Engine
Craftsman: George Luhrs
Knapp Collection #: 93
Catalog #: 2008.10.29
Contributor: Paul Knapp
George Luhrs’ mini single-cylinder engine has a bore and stroke of just 1/8 of an inch. The engine is 6″-long, 3″-wide, and 6″-high.
Magnum 182 V-Twin Model Airplane Engine
Craftsman: Peter Roffe and Brian Stammer
Knapp Collection #: 137
Catalog #: 2009.9.22
Contributor: Paul Knapp
Peter Roffe and Brian Stammer combined two-cylinder assemblies from their single-cylinder 91S to make this 90° V-twin 182.
Magnum 273 3-Cylinder Radial Engine
Craftsman: Peter Roffe and Brian Stammer
Knapp Collection #: 138
Catalog #: 2009.9.23
Contributor: Paul Knapp
This Magnum 273 3-cylinder radial model airplane engine is 20”-long, 9”-wide, and 9”-high. Three 91S cylinder assemblies were adapted to a common crankcase to produce this 3-cylinder radial 273.
Magpie 2-Cycle Marine Engine
Craftsman: Gerald Smith
Knapp Collection #: 302
Catalog #: 2011.35.9
Contributor: Paul Knapp
The Magpie 2-cycle marine engine is a ducted fan air-cooled marine engine. It is a 15cc spark ignition engine developed for model boats.
Manx 250IL 2-Cylinder Inline Model Airplane Engine
Craftsman: Robert Hoskins
Knapp Collection #: 140
Catalog #: 2008.10.40
Contributor: Paul Knapp
This engine turned 7,500 revolutions per minute with a 20-6 propeller on glow ignition, and flew a 35-pound airplane with ease.
Mason “Mastiff” 4-Cylinder Opposed Engine
Craftsman: T.E. Murphy
Knapp Collection #: 11
Catalog #: 2008.16.03
Contributor: Paul Knapp
This engine burns gasoline on spark ignition. it has a 19 mm bore with a 22.2 mm stroke. The Mastiff is 13”-long, 8”-wide, 9”-high, and weighs 13 lbs.
Maverick Hit-n-Miss Engine
Craftsman: Phillip Duclos
Catalog #: 2013.50.9
Donor: George and Dorlene Root
Phillip Duclos’ Maverick hit-n-miss engine was featured in a series of issues of The Home Shop Machinist magazine.
Maytag Wash Machine Engine
Craftsman: Birk Petersen
Catalog #: 2016.15.93
Donor: Mark Petersen
Birk Petersen built this miniature 2-cylinder Maytag wash machine engine.
McCulloch 2-Cylinder Opposed Drone Engine
Craftsman: McCulloch Motors Corporation
Catalog #: 2011.24.1
Donor: Joe Martin
This Righter-designed two-stroke cycle engine was built to power WWII target drones.
Mercury EFI Model Outboard With K&B .45 engine
Craftsman: AMPS
Catalog #: 2013.49.8
Contributor: Daniel "Buzz" Brunkow
Included here are a Johnson F1 with a .65 OS engine (left), an Evinrude F1 with a .45 OS engine (center), and a Mercury EFI F1 with a .45 K&B powerplant (right).
Micro 4-Cycle Single-Cylinder Model Airplane Engine
Craftsman: Ronald Valentine
Knapp Collection #: 244
Catalog #: 2011.32.2
Contributor: Paul Knapp
This air-cooled single-cylinder model airplane engine runs on methanol with glow ignition using custom made glow plugs.
Micro Cirrus 4-Cylinder Inline Engine
Craftsman: Merritt Zimmerman
Knapp Collection #: 60
Catalog #: 2008.10.18
Contributor: Paul Knapp
This Micro Cirrus inline engine runs on methanol with glow ignition, and is among the smallest multi-cylinder 4-cycle engines in the world.
Micro Cirrus 4-Cylinder Inline Engine
Craftsman: Profi M. E.
Knapp Collection #: 61
Catalog #: 2011.35.2
Contributor: Paul Knapp
The Micro Cirrus 4-cylinder inline engine (water-cooled) was built at 1/12 scale. The engine is 5″-long, 6″-wide, and 4″-high.
Micro Cirrus V8 Engine
Craftsman: Merritt Zimmerman
Knapp Collection #: 113
Catalog #: 2011.35.6
Contributor: Paul Knapp
There are two variations of the model Cirrus engine from Ukraine. They run on methanol with glow ignition and are among the smallest multi-cylinder 4-cycle engines in the world.
Micro Dooling 61
Craftsman: John D. Ellis
Knapp Collection #: 153
Catalog #: 2011.27.11
Contributor: Paul Knapp
This miniature Micro Dooling is exactly 1/3-scale, burns methanol on spark ignition, and turns 38,200 revolutions per minute.
Midget Gas Engine
Craftsman: Unknown
Knapp Collection #: 340
Catalog #: 2012.33.15
Contributor: Paul Knapp
The builder of this midget gas engine is unknown. The engine is 9”-long, 6”-wide, and 8.5”-high.
Mike GR6-120 6-Cylinder 2-Cycle Radial Engine
Craftsman: Mike Goldowsky
Knapp Collection #: 111
Catalog #: 2011.35.5
Contributor: Paul Knapp
Mike Goldowsky designed this 6-cylinder 2-cycle engine in an attempt to make a powerful radial engine that would be economically attractive to the average modeler.
Miller 2-Cylinder DOHC Race Engine
Craftsman: Ed Miller
Knapp Collection #: 479
Catalog #: 2016.8.31
Contributor: Paul Knapp
Ed Miller’s second engine is an inline twin DOHC with 1″ bore, 1.25″ stroke, and burns methanol (via his custom carburetors) on spark ignition.
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