Nash 25 HP Vertical Twin Engine
Craftsman: Ramon Hoagland
Knapp Collection #: 583
Catalog #: 2019.10.6
Contributor: Paul Knapp
Ramon Hoagland used Doug Kelley’s plans to build this 1/18 scale model of the NASH 25 HP vertical twin. It is a water-cooled single throw, alternate firing two-cylinder.
Neptune AA1 Outboard Boat Motor
Craftsman: Muncie Gear Works
Knapp Collection #: 352
Catalog #: 2012.33.19
Contributor: Paul Knapp
The Neptune AA1 outboard boat motor is a 1.7 HP model. It’s a water-cooled, two-cycle gas burner that measures barely 23-inches tall.
O.S. FS-91 Cutaway Model Airplane Engine
Craftsmen: Shigeo Ogawa, O.S.
Knapp Collection #: 264
Catalog #: 2011.27.35
Contributor: Paul Knapp
This four-stroke O.S. FS-91 model airplane engine has a partial cutaway of the cylinder block to expose the piston, crankshaft, and camshaft.
Odd Ball Twin Engine
Craftsman: Ron Schindele
Knapp Collection #: 697
Catalog #: 2022.8.8
Contributor: Paul Knapp
This Odd Ball twin engine is a 2-cylinder, 4-stroke air-cooled overhead valve engine with a bore of .687 and stroke of .708.
Offy 270 Racing Engine
Craftsman: Roger Butzen
Knapp Collection #: 782
Catalog #: 2024.5.18
Contributor: Paul Knapp
This impressive Offy 270 racing engine was built by Roger Butzen in 2000.
OHV Inline Slant 4-Cylinder Engine
Craftsman: Dick Pretel
Knapp Collection #: 591
Catalog #: 2019.11.4
Contributor: Paul Knapp
This overhead valve inline slant 4-cylinder engine is tilted 30 degrees to resemble the Pontiac Tempest and Chrysler engines used in the early 1960s.
OLDS Stationary Engine
Craftsman: Ron Schindele
Knapp Collection #: 610
Catalog #: 2019.33.7
Contributor: Paul Knapp
This 1/4 scale OLDS stationary engine measures 7-1/2-inches long, 6-inches wide, 5-3/8-inches high, and weighs 7 pounds on the cart.
Open Crank 6 Inline Engine
Craftsman: Randall Cox
Knapp Collection #: 586
Catalog #: 2019.10.9
Contributor: Paul Knapp
This Open crank 6 inline engine was designed by Randall Cox, and built by Ramon Hoagland in 2018.
Opposed Piston 2-Cylinder Engine
Craftsman: Ramon Hoagland
Knapp Collection #: 738
Catalog #: 2023.2.4
Contributor: Paul Knapp
This opposed piston 2-cylinder engine is 16″-long, 10″-wide, 9″-high, and weighs about 15 lbs.
Otter 30 Inline 4-Cylinder Boat Engine
Craftsman: Dr. Haydock
Knapp Collection #: 42
Catalog #: 2009.9.04
Contributor: Paul Knapp
Dr. Haydock designed single-cylinder, 2-cylinder and 4-cylinder engines for model boats. He built a handful of these Otter 30 cc engines from his own patterns and castings.
Otto-Langen Atmospheric Engine
Craftsman: Ramon Hoagland
Knapp Collection #: 547
Catalog #: 2017.27.1
Contributor: Paul Knapp
This Otto-Langen atmospheric engine was built at 1/7 scale and measures about 11” in diameter by 24”-high. It is a model of the world’s first production combustion engine.
Pacifier V4 Water-Cooled Engine
Craftsman: Bob Shores
Knapp Collection #: 438
Catalog #: 2016.8.22
Contributor: Paul Knapp
This “Pacifier” V4 water-cooled model engine is a mere 5.5″-wide, 6.5″-long, 6″-high, and weighs about 3 pounds. It has a bore and stroke of .625″ and burns gasoline on spark ignition.
Panther Pup 4-Cylinder Engine
Craftsman: Steve Myers
Knapp Collection #: 351
Catalog #: 2012.33.18
Contributor: Paul Knapp
The Panther Pup engine is an air-cooled, four-cylinder, four-cycle designed to burn gasoline on spark ignition.
Parohl 3-Cylinder Radial Aircraft Engine
Craftsman: Henry Parohl
Knapp Collection #: 80
Catalog #: 2009.9.10
Contributor: Paul Knapp
This 3-cylinder radial is a one-of-a-kind custom design that runs on regular gasoline and has a spark ignition. The engine is 9”-long, 12”-wide, and 9”-high.
Parohl Single-Cylinder OHV Model Boat Engine
Craftsman: Henry Parohl
Knapp Collection #: 125
Catalog #: 2008.16.20
Contributor: Paul Knapp
To gain efficiency and performance Henry Parohl installed 4 valves in the head of this model boat engine. The engine is 9”-long, 9”-wide, and 10”-high.
Parsell & Weed Hit N’ Miss Engine
Craftsman: Ron Schindele
Knapp Collection #: 599
Catalog #: 2019.33.3
Contributor: Paul Knapp
This 1/3 scale model Parsell & Weed hit n’ miss engine measures 13.5-inches long, 5.5-inches wide, and 8-inches tall on the skid.
Pegasus R9-2800 Radial Engine
Craftsman: Authentic Scale
Knapp Collection #: 420
Catalog #: 2016.8.15
Contributor: Paul Knapp
The Pegasus R9-2800 radial aircraft engine was made by Authentic Scale, of the US, in 2014. This 1/5-scale engine measures about 11 inches in diameter and resembles the front half of a Pratt & Whitney R2800 Double Wasp radial engine.
Pingstone Tether Boat
Craftsman: Harry A. Pingstone
Knapp Collection #: 485
Catalog #: 2016.44.1
Contributor: Paul Knapp
This Pingstone tether boat measures 12″-wide by 40″-long and is powered by Mr. Pingstone’s custom made 30cc air-cooled overhead cam engine.
Plunket Atmospheric Gas Engine
Craftsman: Roger Butzen
Knapp Collection #: 756
Catalog #: 2024.5.3
Contributor: Paul Knapp
This Plunket atmospheric gas engine was built by Roger Butzen of Texas.
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