“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
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
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
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
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
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
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” 2-Cylinder Model Inboard/Outboard Motor
Craftsman: Allyn
Catalog #: 2013.48.7
Contributor: Daniel "Buzz" Brunkow
Probably the most interesting of the Sea Fury motors is this inboard/outboard design. They came two ways, single and twin-cylinder.
Allyn “Sea Fury” 2-Cylinder Model Outboard Boat Engine
Craftsman: Allyn
Catalog #: 2013.48.2
Contributor: Daniel "Buzz" Brunkow
This “Sea Fury” 2-cylinder model outboard boat engine was made by Allyn. It is probably the most popular engine used on model boats over the years.
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
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
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
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
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
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
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.
Custom Twin K&B Model Boat Engine
Craftsman: Daniel "Buzz" Brunkow
Catalog #: 2013.49.13
Contributor: Daniel "Buzz" Brunkow
This two-cylinder boat engine was custom built by Buzz by combining two K&B .40’s driving a single propeller shaft.
Eldon I 2636 6-Cylinder Model Boat Engine
Craftsman: Eldon Dwyer
Knapp Collection #: 75
Catalog #: 2008.10.23
Contributor: Paul Knapp
After building a prototype from bar stock, Eldon Dwyer made the patterns and castings to produce this 6-cylinder model boat engine.
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