Aerospace Engines A to Z
Aerospace Engines A to Z

Updated: 16-Apr-2021

Based on La Hire's theorem and with the intention of “breaking” with the James Watt's connecting-rod system, the basis of all current piston engines.

Motor Le Grand
“Le Grand”

-They had the intention of eliminating the "rocking" of the connecting rods. The proposed system is of rigid pistons and connecting rods (see Bourke).

-In 1910, Burlat in Lyon made a bi-rotary radial engine with the La Hire method. The same as Pouit, a disciple of Pescara.

We can see that the fresh air enters through the bottom of the piston, formed with the intake valve, which allows it to cool as well.

-The exhaust flows through the cylinder head valve with a truncated conical shape that facilitates the Atkinson phenomenon and automatic evacuation of gases.

Engines of LE-GRAND

Model: Radial rotary, base LaHire

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

Other details:
Le Grand engine

"Le Grand engine"

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