![“Sea Lion” 4-Cylinder Water-Cooled Marine Engine](https://craftsmanshipmuseum.com/wp-content/uploads/2022/12/PK124a-125x125.jpg)
“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](https://craftsmanshipmuseum.com/wp-content/uploads/2022/12/PK189a-125x125.jpg)
“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](https://craftsmanshipmuseum.com/wp-content/uploads/2022/12/Knapp180a-125x125.jpg)
“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](https://craftsmanshipmuseum.com/wp-content/uploads/2022/12/Knapp179a-125x125.jpg)
“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](https://craftsmanshipmuseum.com/wp-content/uploads/2022/12/Knapp106a-125x125.jpg)
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.
![1/12 Scale Model Trojan Runabout Wooden Boat](https://craftsmanshipmuseum.com/wp-content/uploads/2022/04/Trojan14i-125x125.jpg)
1/12 Scale Model Trojan Runabout Wooden Boat
Craftsman: Robert Rattazzi
Catalog #: 2014.12.1
Contributor: Robert Rattazzi Jr.
This 1/12 scale wooden Trojan runabout with Mercury outboard motor was built by Robert Rattazzi, who modeled it after his own full-size Trojan.
![1/4 Scale 4-Engine Model Offshore Powerboat Racer](https://craftsmanshipmuseum.com/wp-content/uploads/2024/01/2014.32.1-125x125.png)
1/4 Scale 4-Engine Model Offshore Powerboat Racer
Craftsman: Bob Gregory
Catalog #: 2014.32.1
Contributor: David James
Appropriately named, “Ultimate,” this twin-cockpit boat was built as a concept model by Bob Gregory.
![1/6 Scale Gar Wood 33-50 Runabout With V-12 Liberty Engine](https://craftsmanshipmuseum.com/wp-content/uploads/2024/03/2024.2.1c-125x125.png)
1/6 Scale Gar Wood 33-50 Runabout With V-12 Liberty Engine
Craftsman: Louis Chenot
Catalog #: 2024.2.1
Donor: Louis Chenot
After six years of labor, Louis Chenot completed his scratch-built 1/6 scale Gar Wood 33-50 Runabout with V-12 Liberty marinized aircraft engine.
![2-Cylinder Reversible Marine Steam Engine](https://craftsmanshipmuseum.com/wp-content/uploads/2023/02/Randall2014.17.2a-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2022/12/Knapp11-255-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2023/02/Brunk48.7a-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2023/02/Brunk48.2a-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2023/02/Moore02b-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2023/02/Brunk49.4.5-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2023/02/Brunk49.4.5-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2023/02/Brunk49.12a-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2023/02/Brunk48.3a-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2022/12/Knapp11-247-Bennett-125x125.jpg)
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](https://craftsmanshipmuseum.com/wp-content/uploads/2022/12/PK91b-125x125.jpg)
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.
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