Aerospace Engines A to Z
Aerospace Engines A to Z

Updated: 25-Mar-2021

Among the novelties of the 1922 Paris Air Show was a small two-stroke rotary engine designed by Paul Petit.

Petit 2-stroke engine cross-section
“Petit 2-stroke engine cross-section”

-Analyzing the shape of the piston, we observe that it has an upper “skirt” with ports and which is also inserted into a long cylinder head.

-According to the information that accompanies this illustration, the intention was to save the complicated and fragile system of piston head valves that radial rotary engines had at that time.

-This also saves weight with the two-stroke cycle and gains in simplicity.

Engines of PETIT

Model: Rotary radial, 2-stroke

Arquitecture:
Cooling:
Total Displacement:
Bore / Stroke: x
Power:
Weight:

Other details:

The author of this edition of Aeroengines AtoZ, through Aeroteca, collaborated on Version 2 of this video, which is presented here.

To understand the operation of the connecting rods, the 1929 Continental R 670 single-cylinder engine was chosen.

A demonstration of Version 3, improved at the author's suggestion, is also available on YouTube at a later date. This version shows bronze valve guides, improved valve spring movement, and the split crankshaft counterweights and front bearing balls also move.

The design is from Juan Soler, Sant Cugat, Barcelona

Below we show a flash of version 3

Counting also with the coloboration of JMC of Enginys Mecanics in Mataro, Barcelona