Jerry E. Howell Model Project Plans & Kits
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(World Wide Supplier of Quality Model Project Plans & Kits Since 1992)

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"Duplex Vacuum" Stirling Cycle Engine

This engine is not a "vacuum" engine, it is a "beta" type stirling engine. Beta means that the power piston and the displacer are both working in the same cylinder. This arrangement gives greater power output than the typical two cylinder engine. The reason for this is that the compression ratio can be higher due to less "dead" space inside the engine.

The Duplex Vacuum Company of Chicago, Illinois made this type of engine about 100 years ago. They were widely used in popcorn wagons and to operate dental drills among other applications due to their silent operation and reliability.

A unique feature of the Duplex engines is the oscillating shaft and linkage which produces an interesting motion in operating the displacer.

The plans set consists of 8 sheets of drawings and 2 sheets of construction and assembly notes.

Specifications:

Bore: .750" Stroke: .750" Flywheel Dia.: 3.750" Height: 10-5/8"

"Duplex Vacuum" Engine Plans Set - $23.00
(Use the Project Plans Order Form to place an order. Otherwise, see the "How To Order" page)

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Graphite & Bearings Kit

(1) Graphite rod to make piston
(2) 3/16" ID x 3/8" OD x 1/8" thick precision ball bearings

Duplex Engine Graphite & Bearings Kit $16.00
(Use the Kits & Parts Order Form to place an order. Otherwise, see the "How To Order" page)

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