The Army issued a specification for a new engine, known as the R-1454, on 15 Aug 1923. Development of the engine itself had been carried out by the Army through Wright, Lawrance, and an independent engineer, S D Heron, and had been through many changes, to the cylinders in particular. The fixed-price contract was won by Curtiss, following its bid on 13 Nov 1923, and was for the construction of three engines with an option for three more. The first engine was delivered in Sept 1924 and it gave up to 405hp @ 1650rpm. A modified cylinder developed by Heron (Type M) was fitted to the engine, and the Army instructed Curtiss to proceed with the other engines called for under the contract in Feb 1926.
Output: 400hp
Capacity: 1454ci.
All Aero 