Sometimes known simply as Cyclone (possibly referring to the engine of the previous Item).

-It is a very special engine, a 9-cylinder radial that was used for studies only. It gave 90 hp, and was developed in 1915.

-The cylinders were attached to the crankcase by their head or bottom of the combustion chamber, that is, upside down their normal position.

"Cyclone - Collet"

-The exhaust was produced at the end of the piston stroke, that is to say, close to the engine periphery.

-You can see the "connecting rods" on the outside and the inclinations that they have with respect to the cylinder axis according to the position.

"Cyclone - Collet engine diagram"

-The pistons and their short rods form a rigid assembly.

-The presented diagram is the seven-cylinder rotary version.

-In the center of the radial there is a circular crown and the radial rotates around the central group in a uniform motion.

-The cylinders are the ones that move up and down, with the radial crankcase.

-Cyclone-Collet had in fact two solutions to this principle, although both theoretically and experimentally.