The Hydro flying boat built by Christofferson Aviation flew in 1913, and was probably designed by Alan Loughead who worked for Christofferson at the time.
A two-bay biplane, of the three or four examples known to have been completed in 1914, two were sold to explorer Roald Amundsen for a proposed Arctic flight (that never happened), and one was used by Silas Christofferson’s San Francisco-Oakland Aerial ferry in 1914. This was the second scheduled airline to operate in the US.
Another Hydro is listed as having been sold to Japan.
Engine: Hall-Scott V-8, 120 hp
Span: upper: 49′ lower 33’6″
Length: 28′
All Aero 