There should be a lot more on BRF about the racing outboards built by Paul Bonnemaison and his patron Ricardo Soriano here on BRF.

Soriano was a Spanish nobleman with a passion for racing and some cash for investing. Looking at an add on Marc Hammer's http://www.soriano-outboard.com/ website shows outboards and motorcycles among other things being sold under the Soriano name.

Bonnemaison was a successful French outboard racer in the 1920's.

Bonnemaison and Soriano got together with one thing in mind ... to build the ultimate racing outboard at the time when the fastest speed ever achieved by an outboard was still less than 50 mph.

The first version was a 4 stroke 4 cylinder opposed motor like the old air cooled VW motor or if you are thinking 21st Century ... a Subaru car motor. To get good power to weight ratio Bonnemaison used overhead valves and overhead cams and a Rootes type supercharger.

The 4 cylinder Soriano was just over 40 ci (just over 650cc's) and made an amazing 65 hp.

The actual production of the Soriano motors was contracted to a company in Spain with experience in casting steel and aluminum ... OSSA. The same OSSA that would later be famous for dirt bikes with monster power and advanced suspension. If you are familiar with OSSA's logo you will recall the cloverleaf looking emblem in the middle of the O ... the O with that is supposed to represent a film reel, the cloverleaf looking thing are the spokes of the reel. Motion picture projectors were their original main product