The upper wing had a centre-section filling 63% of the span and two outer panels; all sections were essentially rectangular, though the wingtips were slightly blunted.

Both upper and lower wings combined wood and metal construction, had two spars and were fabric covered with plywood leading edges.

A pair of N-form struts supported both the inner upper wing and the centrally positioned, pusher configuration, 541 kW (725 hp) Hispano-Suiza 12Nbr liquid-cooled V12 engine.

The engine sat on the wing in a flat-sided cowling, with its honeycomb radiator at the front and a three-bladed propeller working in a rectangular cut-out in the trailing edge.

Single-stepped floats, each mounted on two pairs of short struts from the tips of the lower wings ensured lateral stability on water.

In the nose was an open position from which a crew member could take observations or bearings, assist with mooring or, in event of attack, uses a pair of machine guns on a flexible mounting.

[2][3] Passage rearwards between the seats led to a large cabin with windows for observation, containing radio equipment, a mapping table and a camera mounted for vertical or oblique photographs.

All three joined the bottom end of an oblique Messier retracting shock absorber which projected inwards above the wing.