
Orwick .64 Model Airplane Engine
Craftsman: Henry Orwick
Catalog #: 2011.19.8
Contributor: Cheryl Martin
An Orwick .64 model airplane engine built between 1946-1948. This engine is serial No. 64469.

Oscillating Cylinder Steam Engine
Craftsman: Rudy Kouhoupt
Donor: Susan Alvaro
Rudy’s miniature oscillating steam engine captures the solid construction and smooth running characteristics of its full-size counterparts.

Oscillating Steam Engine
Craftsman: Rudy Kouhoupt
Donor: Susan Alvaro
This oscillating steam engine, designed and built by Rudy Kouhoupt, has served as a great beginner project for eager model engineers.

Oscillating Steam Engine
Craftsman: Rudy Kouhoupt
Donor: Susan Alvaro
This small oscillating steam engine is another illustration of the variety of different configurations built by Rudy Kouhoupt.

Oscillating Steam Engine
Craftsman: Rudy Kouhoupt
Donor: Susan Alvaro
This tiny oscillating steam engine isn’t much larger than a US quarter.

Oscillating Steam Engine
Craftsman: Rudy Kouhoupt
Donor: Susan Alvaro
This small oscillating steam engine is yet another simple and functional design by Rudy Kouhoupt.

Oseberg Viking Burial Ship
Craftsman: Michael Titone
Catalog #: 2011.34.4
Contributor: Michael Titone
This 1/25 scale plank-on-frame model of an Oseberg Viking burial ship was built by Michael Titone starting from a Billings Boats kit.

Ostrich Egg Dollhouse Scene
Craftsman: Sheila McKisic
Catalog #: 2017.24.11
Contributor: San Diego Miniature Crafters Assn.
This clever dollhouse scene was crafted inside of an ostrich egg by Sheila McKisic.

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.

Overcrank Vertical Steam Engine
Craftsman: Rudy Kouhoupt
Donor: Susan Alvaro
This Overcrank vertical steam engine features a unique system of links and levers to guide the piston rod.

P-51 Mustang Paper Airplane
Craftsman: Huntly Briggs
Catalog #: 2015.21.1
Donor: Huntly Briggs
This unique paper airplane is modeled after a P-51 Mustang.

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.

Pacinotti Machine
Craftsman: Birk Petersen
Catalog #: 2016.15.72
Donor: Mark Petersen
This small Pacinotti machine can be run with an electric motor.

Paddle Wheel Engine
Craftsman: Birk Petersen
Catalog #: 2016.15.5
Donor: Mark Petersen
This riverboat paddle wheel is driven by a dual horizontal steam engine—all built by Birk.

Pancake Stirling Engine
Craftsman: Birk Petersen
Catalog #: 2016.15.111
Donor: Mark Petersen
A miniature pancake Stirling engine made by Birk Petersen.

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.

Panther Pup Gas Engine
Craftsman: Birk Petersen
Catalog #: 2016.15.13
Donor: Mark Petersen
This brass Panther Pup 4-cylinder internal combustion engine runs on gas with spark ignition.

Paper Models
Craftsman: David Kemp
Catalog #: 2019.16.1 ; 2019.16.2 ; 2019.16.3 ; 2019.16.4
Donor: David Kemp
David Kemp built and donated four paper models including a model tank, an SE5 airplane, a Sopwith Dolphin airplane, and a German airplane.
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