Kinner Radial Model Airplane Engine
Craftsman: Charles “Chuck” Harty
Knapp Collection #: 523
Catalog #: 2017.27.8
Contributor: Paul Knapp
This Kinner radial model airplane engine was built using construction articles published in Strictly IC magazine. It has a 1.062 bore and a 1.312 stroke for a total displacement of 5.8 cubic inches.
Mike GR6-120 6-Cylinder 2-Cycle Radial Engine
Craftsman: Mike Goldowsky
Knapp Collection #: 111
Catalog #: 2011.35.5
Contributor: Paul Knapp
Mike Goldowsky designed this 6-cylinder 2-cycle engine in an attempt to make a powerful radial engine that would be economically attractive to the average modeler.
Miniature 3-Cylinder Radial Engine
Craftsman: Cliff Bumpus
Knapp Collection #: 78
Catalog #: 2009.9.09
Contributor: Paul Knapp
Cliff Bumpus designed and machined this miniature engine from bar stock (aluminum ingots). The cylinders are spaced 120° apart in a circular pattern.
Miniature 7-Cylinder Radial Engine
Craftsman: Lee Root
Knapp Collection #: 101
Catalog #: 2009.9.14
Contributor: Paul Knapp
This miniature 7-cylinder radial engine was machined entirely from bar stock. Mr. Root’s 7-cylinder was ahead of its time and more advanced than most miniature engines made today.
Miniature 7-Cylinder Radial Engine
Craftsman: Pierre Blais
Knapp Collection #: 83
Catalog #: 2009.9.11
Contributor: Paul Knapp
This 7-cylinder radial engine burns a methanol/castor oil mixture on glow ignition. The engine is 10”-long, 11”-wide, and 12”-high.
Miniature 7-Cylinder Radial Engine
Craftsman: Pius Job
Knapp Collection #: 86
Catalog #: 2008.16.14
Contributor: Paul Knapp
This engine burns methanol (with oil mixed in for lubrication) on glow ignition and turns a 24-10 propeller at 6,000 rpm. The engine is 10”-long, 9”-wide, and 15”-high (on stand).
Morton M5 5-Cylinder Radial Engine
Craftsman: Morton Aviation
Knapp Collection #: 18
Catalog #: 2009.9.01
Contributor: Paul Knapp
The Morton M5 5-cylinder radial engine was designed and built by Morton Aviation. The M5 was the first miniature radial engine made for model airplanes.
Morton M5 Radial Model Aircraft Engine (cutaway)
Craftsman: Dennis Fadden
Knapp Collection #: 20
Catalog #: 2008.10.8
Contributor: Paul Knapp
A Morton M5 radial model aircraft engine (cutaway). The engine is 7″-long, 6″-wide, and 7″-high.
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.
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.
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.
RCS 400 5-Cylinder Radial Airplane Engine
Craftsman: Moki, Inc.
Knapp Collection #: 201
Catalog #: 2008.16.43
Contributor: Paul Knapp
This RCS 400cc radial burns a gasoline/oil mixture on spark ignition. The unique electronic ignition utilizes a miniature high tension coil located at each spark plug.
Robarts R780 7-Cylinder Radial Engine
Craftsman: Bob Walker
Knapp Collection #: 13
Catalog #: 2011.27.3
Contributor: Paul Knapp
This Robarts R780 7-cylinder radial engine has a bore of 1.125 inches and stroke of 1.125 inches for a total displacement of 7.8 cubic inches.
Satra “R-5” Model Radial Airplane Engine
Craftsman: Bruce Satra
Knapp Collection #: 202
Catalog #: 2008.16.44
Contributor: Paul Knapp
Intrigued by the Morton M5, Bruce Satra built a more robust design which he dubbed the Satra R-5. The bore is .700 and stroke is .625, making the total displacement 1.2 cubic inches.
Seidel 770 Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 15
Catalog #: 2022.8.1
Contributor: Paul Knapp
This Seidel ST770 engine is a 7-cylinder 70cc (4.17 cubic inch) radial engine with a speed range or 1,000 to 6,000 revolutions per minute (rpm), using a 26-10 propeller.
Seidel Prototype Radial Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 283
Catalog #: 2011.32.5
Contributor: Paul Knapp
This pre-production model, built in the early 1980s, is one of Mr. Seidel’s first prototypes intended to introduce his engines at trade fairs and model airplane shows.
Seidel ST 1426 14-Cylinder Radial Model Aircraft Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 56
Catalog #: 2008.10.16
Contributor: Paul Knapp
The ST 1426 is the largest engine in the series, and perhaps the largest model airplane engine commercially sold.
Seidel ST 525 5-Cylinder Radial Model Airplane Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 70
Catalog #: 2008.10.22
Contributor: Paul Knapp
The Seidel ST 525 radial airplane engine is among the largest 5-cylinder model airplane engines built to date.
Seidel ST 540 5-Cylinder Radial Model Aircraft Engine
Craftsman: Wolfgang Seidel
Knapp Collection #: 14
Catalog #: 2008.10.5
Contributor: Paul Knapp
The Seidel ST540 has a speed range of 1,100 to 6,800 revolutions per minute, using a 22-6 propeller.
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