Fifty Curtiss H.12 "
Large America" were ordered in Britain and began arriving in March 1916. The underpowered Curtiss engines were replaced with Rolls-Royce 250-hp Eagle VIIIs, which increased the plane's capabilities remarkably.
There is some confusion over the difference between H.12s, H.12Bs, and H.16s. After the initial batch with the 250hp engine, another twenty-four were upgraded with the 375hp Rolls-Royce and were designated the H.12B, and a further fifteen were ordered as H.12s without engines, delivered as H.16s, and fitted with the 375hp Rolls-Royce.
Lessons learned from flying the H.12s led to the excellent Felixstowe F.2, with a stronger hull and improved hydrodynamics.
Perhaps the H.12's finest moments were on 14 May 1917 when a RNAS Curtiss shot down the zeppelin L22 and on 14 June 1917 when L43 was shot down by another. H.12 operated widely and had frequent encounters with German seaplanes and submarines.
The US Navy experimented with H.12s (including some with Liberty engines), but the type was not used internationally.
Curtiss HS-1L's filled that role instead.
DESIGNER NOTE:
Models at scales smaller than 1:144 may no longer be available. Shapeways discontinued the material for which they were designed, and the newer materials require that each and every model be adjusted to thicken surfaces like wings. If you are interested in a particular model in a small scale, please let me know and I will prioritize it higher in the queue.
See
https://linen.miraheze.org/wiki/Curtiss_H-12.