By 1931 Pratt & Whitney had started a development of their equally famous single-row, Wasp nine-cylinder design into a larger and much more powerful fourteen-cylinder, twin-row design - the Twin Wasp — of a nearly identical 30-liter displacement figure, that would easily compete with this larger, single-row Cyclone. In 1935 Wright decided to follow P&W's lead, and started to develop much larger engines based on the mechanics of the Cyclone. The result was two designs with a somewhat shorter stroke, a 14-cylinder design that would evolve into the Twin Cyclone, and a much larger 18-cylinder design that became the R-3350.