Initials of Socqueville et Hoyau.

-In 1910 they built single-valve rotary engines (Monosoupape), but not under the Gnome concept.

“SHK single-valve”

-It is a double concentric valve in which first the central valve opens the exhaust and in the next step in the sequence a jacket that surrounds the valve opens the intake passages, and the exhaust valve closes.

-Four types of SHK engines were made, the most common being the 70 CV 7-cylinder.

-The 14 cylinder gave 110 HP.

“SHK seven-cylinder engine”

From Appendix 12: Another photo of the 7-cylinder engine in radial arrangement giving 70 HP.

“From the Krakow Aviation Museum, SHK engine”

-Document taken from the Museum's technical library, available on the Internet.

-Of its 70 HP radial engine. now a front view of it.

“70 HP SHK engine”