“KEN” Single-Cylinder, Air-Cooled Marine Engine

“KEN” Single-Cylinder, Air-Cooled Marine Engine

Craftsman: Dick Pretel

Knapp Collection #: 181

Catalog #: 2008.16.32

Contributor: Paul Knapp

From approximately six sets of castings made by Ken Brennerman in the mid 1930s, this is the only known surviving engine.

“Sea Lion” 4-Cylinder Water-Cooled Marine Engine

“Sea Lion” 4-Cylinder Water-Cooled Marine Engine

Craftsman: Jim Hawk

Knapp Collection #: 124

Catalog #: 2008.10.35

Contributor: Paul Knapp

This tiny marine engine was designed and sold as a casting kit. Jim Hawk made several modifications to the original design to improve efficiency and performance.

“Eldon I 2636” 6-Cylinder Inline Model Boat Engine

“Eldon I 2636” 6-Cylinder Inline Model Boat Engine

Craftsman: Jim Hawk

Knapp Collection #: 189

Catalog #: 2008.10.52

Contributor: Paul Knapp

This engine is water-cooled (including the exhaust), sports a 120-degree crankshaft, and burns methanol on glow ignition. It measures 13″- long, 7″-wide, and 7″-high.

“Gannet” Single-Cylinder, Water-Cooled Marine Engine

“Gannet” Single-Cylinder, Water-Cooled Marine Engine

Craftsman: Gannet Engines; Modified by Dick Pretel

Knapp Collection #: 180

Catalog #: 2008.16.31

Contributor: Paul Knapp

Dick Pretel modified the popular Gannet marine engine to suit his performance demands. His newly designed head included four valves and an extra exhaust pipe for better breathing.

“Water Witch” Single-Cylinder Marine Engine

“Water Witch” Single-Cylinder Marine Engine

Craftsman: Dick Pretel

Knapp Collection #: 179

Catalog #: 2008.16.30

Donor: Paul Knapp

Dick Pretel modified the original “Water Witch” castings to create this custom machined version. The engine burns gasoline on spark ignition.

1-Cylinder, 4-Cycle Model Boat Motor

1-Cylinder, 4-Cycle Model Boat Motor

Craftsman: Henry Parohl

Knapp Collection #: 106

Catalog #: 2008.16.17

Contributor: Paul Knapp

This 1-cylinder, 4-cycle model boat motor is 5”-long, 4”-wide, and 4”-high.

2-Cylinder Reversible Marine Steam Engine

2-Cylinder Reversible Marine Steam Engine

Craftsman: Jack Randall

Catalog #: 2018.18.2

Donor: Katherine Randall

This 2-cylinder reversible marine steam engine is capable of running in either direction. It was built from a casting kit.

4-Cylinder, Water-Cooled Inline Boat Engine

4-Cylinder, Water-Cooled Inline Boat Engine

Craftsman: Unknown

Knapp Collection #: 255

Catalog #: 2011.27.31

Contributor: Paul Knapp 

This 4-cycle water-cooled marine engine burns methanol or gasoline on glow ignition and sports an electric starter.

Allyn “Sea Fury” Model Outboard Motor

Allyn “Sea Fury” Model Outboard Motor

Craftsman: Allyn

Catalog #: 2012.29.1

Contributor: Andy Moore

This tiny outboard motor has a cylinder size of about .049. Like the real engines of this vintage, it was pull-started with a cord around the exposed flywheel.

Alterscale Model Outboard Mercury 2.5 liter EFI

Alterscale Model Outboard Mercury 2.5 liter EFI

Craftsman: Alterscale

Catalog #: 2013.49.4

Contributor: Daniel "Buzz" Brunkow

Alterscale makes detailed diecast models of selected outboard motors. This pair includes a 1/9 scale black 1997 Mercury 2.5 liter electronic fuel injected model (left).

Alterscale Model Outboard Mercury 4

Alterscale Model Outboard Mercury 4

Craftsman: Alterscale

Catalog #: 2013.49.5

Contributor: Daniel "Buzz" Brunkow

Alterscale makes detailed diecast models of selected outboard motors. This pair includes a 1/8 scale 1957 Mercury Mark 4 in light blue (right).

AMPS Custom Twin-Prop Outdrive

AMPS Custom Twin-Prop Outdrive

Craftsman: AMPS and Daniel "Buzz" Brunkow

Catalog #: 2013.49.12

Contributor: Daniel "Buzz" Brunkow

A unique AMPS outdrive with twin propellers. Powered by a motor mounted inside the boat, this geared outdrive has an R/C controlled tilt mechanism to trim the prop angle.

Atwood .051 Model Outboard Boat Engine

Atwood .051 Model Outboard Boat Engine

Craftsman: Atwood

Catalog #: 2013.48.3

Contributor: Daniel "Buzz" Brunkow

This Atwood .051 model boat engine is a rare twin-cylinder gas powered outboard with large, polished front gas tank.

Bennett Water-Cooled Opposed Twin Engine

Bennett Water-Cooled Opposed Twin Engine

Craftsman: Paul Bennett 

Knapp Collection #: 247

Catalog #: 2011.27.25

Contributor: Paul Knapp 

This opposed water-cooled twin engine has a 1-inch bore with a 3/4-inch stroke, double throw crank, and runs on gasoline with spark ignition.

Clarke 1-Cylinder Trolling Boat Motor

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

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.

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Presented by The Joe Martin Foundation for Exceptional Craftsmanship