In an old aeronautical publication we found a reference on an engine designed by Desiderio Martinez Feduchy. (DMF)

-From the year 1911. Madrid, February 15. And it says:

-DMF rotary engine.

-"In the midst of a completely hostile environment, in the midst of the most absolute indifference of the common of my fellow citizens, there are many Spaniards who put their intelligence and their enthusiasms at the service of progress"

-"Rotary engine - built by Desiderio Martinez Feduchy with the aim, the first one of this type built in Spain, with 35 CV and 58 Kg of weight."

-Therefore, it is reflected here for the search of more details and later development.

From Appendix 10: DMF are the initials of Desiderio Martinez Feduchy, in the years 1910 and 1911 he made patents and even a material realization of types of interesting engines at the time.

.-One two-stroke engine and another four-stroke one. Below we show the patent copy for the three radial cylinders operating in two strokes, the "Dessy"

"Feduchy 2-stroke engine with swiveling cylinders"

-The cylinders are fastened with bolts by the head so that they oscillate when forced by pistons and connecting rods. The crank heads - attached to the crankshaft - are only sectors like on the French Le-Rhone engines.

"Four-stroke patent with sliding valves"