The Essex Hot Air Engine is a replica model in scale 1:1 based on the US-patent No. 723660 granted to Henry Essex in 1903. The patent can be downloaded from a patent server.
This hot air engine is a very elegant and unusual design in which the displacer cylinder and the power cylinder are arranged in the opposed cylinder type. The heating zone is located in between the cylinders. This hot air engine is a beta type engine.
The original engines were used for running fans, peanut roasters, window displays, dental drills and sewing machines.
The model was build from castings. The castings and a set of drawings I purchased from myfordboy.
The model is fired with gas fuel. This engine is a version with water cooler at the displacer end.
Technical Data:
Power piston diameter: 47,5mm
Displacer piston diameter: 45 mm
Stroke power piston: 32mm
Stroke displacer piston: 38mm
Power piston length: 122mm (incl. extension cap)
Displacer piston length: 119mm
Overall dimensions: 49 x 16 x 18cm