Can you note that the comment Parnall Peto refers to the British sub photo that you posted. The Parnall was British and is the Acft in that photo. The subject photo is the Cox-Klemin XS-1 (because of the 3-cylinder engine.)

That's a Parnall Peto, built by George Parnall and Company, Ltd.

http://en.wikipedia.org/wiki/Parnall_Peto

Or XS-2, depending on the engine. They both competed in trials during 1926 with the very similar Martin MS-1, before the Navy eventually decided to drop the whole idea.

One old adage that I remember came from a friend who was in the submarine service: "There's only two kinds of ships in the Navy-submarines and targets."

That raises the perhaps stupid question of how the submarine plane was designed and fitted out in order to be submerged? As in strapped on the deck while underwater. Looking at the photo, it seems much of that mini floatplane could be assembled and disassembled readily. And placed in a waterproof chamber perhaps? My father was a WWII submariner, a torpedo man on the USS Raton. Didn't talk about it all that much. But his South Pacific shore leave stories were hilarious.

[Click the photo below. - Dave]

Submarine plane...? Hope that name didn't reflect on its ability to stay in the air, and not under water. More likely just another one of those off-the-cuff descriptive titles that didn't last as long as its subject did.

[It's a floatplane that could be launched from a submarine. Who can identify it ... Caspar-Heinkel U-1? - Dave]