Britnell Original Design Radial Engine
Craftsman: George Britnell
Catalog #: 2019.23.1
Donor: George Britnell
George’s radial has a bore and stroke of .625 x .600. Designed and built in 2012, it took about 600 hours to complete.
Coholic 3-Cylinder Radial Engine
Craftsman: Andrew Coholic
Knapp Collection #: 37
Catalog #: 2008.16.05
Contributor: Paul Knapp
Andrew Coholic designed and built this tiny 2-cycle radial engine by mounting three Cox .049 engines into a common crankcase. The engines are geared together with a common propeller shaft.
Cox .75 5-Cylinder Radial Engine
Craftsman: Paul Daniels
Knapp Collection #: 26
Catalog #: 2011.27.5
Contributor: Paul Knapp
This Cox .75 radial aircraft engine is 7″-long, 8″-wide, 9″-high, and weighs 7 lbs. 8 oz. The “Cox .75” consists of five Cox .15 cubic-inch engines geared together.
Custom 5-Cylinder Radial Airplane Engine
Craftsman: Charles “Chuck” Harty
Knapp Collection #: 527
Catalog #: 2017.27.12
Contributor: Paul Knapp
Chuck’s custom 5-cylinder radial engine resembles the Morton M5 but measures 8” in diameter, 8”-long, and weighs 6 pounds 5 ounces on the base.
Edward’s Style 5-Cylinder Radial Airplane Engine
Craftsman: Charles “Chuck” Harty
Knapp Collection #: 524
Catalog #: 2017.27.16
Contributor: Paul Knapp
This Edward’s style 5-cylinder radial airplane engine closely resembles Forest Edward’s radial engine in size and configuration; however, it does not have a pressure lubrication system.
Edwards 5-Cylinder Radial
Craftsman: Forest Edwards
Knapp Collection #: 02
Catalog #: 2008.10.1
Contributor: Paul Knapp
1/4 Scale 5-cylinder radial airplane engine.
Edwards FA90-3, 3-Cylinder Radial Aircraft Engine
Craftsman: Forest Edwards
Knapp Collection #: 192
Catalog #: 2008.16.36
Contributor: Paul Knapp
Forest Edwards’ first homemade model airplane engine. He utilized the cylinder heads and cams from three Saito FA-30 single cylinder model airplane engines to produce this radial.
Fadden 1-Cylinder and 3-Cylinder Engines
Craftsman: Dennis Fadden
Knapp Collection #: 05 and 06
Catalog #: 2008.16.02
Contributor: Paul Knapp
Dennis Fadden designed both the 1-cylinder and the 3-cylinder engines in the early 1990s. Both engines have spark ignition and burn regular gasoline or methanol mixed with oil for lubrication.
G-Mark .30 5-Cylinder Radial Engine
Craftsman: G-Mark
Catalog #: 2010.19.3
Donor: Jerry Nelson
Built by G-Mark and donated by Jerry Nelson. The G-Mark .30 5-cylinder radial engine was made in Japan.
Gasparin 18-Cylinder Radial CO2 Engine
Craftsman: Stefan Gasparin
Knapp Collection #: 288
Catalog #: 2011.32.8
Contributor: Paul Knapp
Stefan Gasparin designed and built over 60 variations of CO2 engines from 1 through 18-cylinders—including single-cylinder, inline, opposed flat, “V,” rotary, and radial configurations.
Gasparin 3-Cylinder Soda Gas (CO2) Radial Engine
Craftsman: Stefan Gasparin
Knapp Collection #: 286
Catalog #: 2011.32.6
Contributor: Paul Knapp
Stefan Gasparin designed and built over 60 variations of CO2 engines from 1 through 18-cylinders—including single-cylinder, inline, opposed flat, “V,” rotary, and radial configurations.
Handt 3-Cylinder Radial Aircraft Engine
Craftsman: Erich Handt
Knapp Collection #: 191
Catalog #: 2011.27.15
Contributor: Paul Knapp
In this design, Erich Handt used three carburetors—one for each cylinder. It runs on methanol with oil mixed in for lubrication.
Handt 5-Cylinder Radial Aircraft Engine
Craftsman: Erich Handt
Knapp Collection #: 190
Catalog #: 2011.27.14
Contributor: Paul Knapp
Erich Handt machined and constructed his first two-cycle engine in 1967, and his first successful four-cycle engine in 1971.
Heinen 5-Cylinder Radial Engine
Craftsman: Charles “Chuck” Harty
Knapp Collection #: 528
Catalog #: 2017.27.7
Contributor: Paul Knapp
This Heinen 5-cylinder radial engine measures 10” in diameter, 7.5”-long, and weighs 10 pounds. The drawings for Jurgen Heinen’s radial were published in Strictly IC magazine in 1990.
Hodgeson 7-Cylinder Radial Airplane Engine
Craftsman: Charles “Chuck” Harty
Knapp Collection #: 525
Catalog #: 2017.27.6
Contributor: Paul Knapp
This Hodgeson 7-cylinder radial airplane engine measures 12” in diameter, 11”-long, and weighs 10 pounds 9 ounces.
Jemma 7-Cylinder Radial Airplane Engine
Craftsman: Charles “Chuck” Harty
Knapp Collection #: 526
Catalog #: 2017.27.11
Contributor: Paul Knapp
Built from construction articles in Strictly IC Magazine, the engine is machined completely from bar stock; there are no castings. It is about 9-inches in diameter and 8-inches long.
JEMMA 7-Cylinder Radial Engine
Craftsman: Bob Haagenson
Knapp Collection #: 358
Catalog #: 2013.53.2
Contributor: Paul Knapp
The JEMMA 7-cylinder radial engine is 13”-long, 9”-wide, 10”-high, and weighs 11 lbs. 6 oz. It has a bore of .750 and stroke of .800.
JT 1800 9-Cylinder Radial Model Airplane Engine
Craftsman: John V. Thompson
Knapp Collection #: 145
Catalog #: 2008.10.43
Contributor: Paul Knapp
This 9-cylinder radial engine weighs 28 pounds and has a 1.25-inch (32 mm) bore and a 1-inch (24.8 mm) stroke with a total displacement of 10.8 cu. in. (180 cc).
King “741” 7-Cylinder Radial Airplane Engine
Craftsman: Stephen J. King
Knapp Collection #: 200
Catalog #: 2008.16.42
Contributor: Paul Knapp
This King “741” 7-cylinder, two-cycle, air-cooled radial airplane engine is similar in appearance to the “Gnome” rotary engines of WWI.
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