Editing Hyper engine (section)

===Continental O/V/IV/XIV-1430===
{{main|Continental I-1430}}
[[File:Continental I-1430.jpg|thumb|IV-1430-9 in the [[National Museum of the United States Air Force]]]]
The Army apparently became concerned about the development of a suitable supercharger for high-altitude use, and for further development in 1934 they asked for a newer cylinder with slightly less performance and an increased volume of 118.8&nbsp;in<sup>3</sup> from its {{convert|5.5|in|mm|abbr=on}} bore and {{convert|5.0|in|mm|abbr=on}} stroke. This size cylinder would then be used in a 1,425&nbsp;in<sup>3</sup> 12-cylinder engine, delivering the same 1,000&nbsp;hp, with a performance of 0.7&nbsp;hp/in<sup>3</sup>. This placed its performance on a par with newer experimental engines from Europe like the [[Rolls-Royce Merlin|Rolls-Royce PV-12]], at least when running on the higher-octane fuels the Army planned to use.<ref name="White376">White p&nbsp;376</ref>

Another change was to the engine layout. The Army, convinced that future aircraft designs would use engines buried in the wings for additional streamlining, asked Continental to design a full-sized flat-horizontally opposed engine for installation inside a wing. The resulting engine was the Continental O-1430, which would require a ten-year development period which changed the layout to first an upright [[V12 engine|V-12 engine]] and later, an inverted V-12 engine before becoming reliable enough to be considered for full production as the Continental IV-1430 in 1943. By then other engines had already passed its 1,600&nbsp;hp (1,200&nbsp;kW) rating, and although the IV-1430 had a better power-to-weight ratio, there was little else to suggest setting up production in the middle of the war was worthwhile.<ref name="White376"/>

The project was eventually guided by the requirements in the "Request for data R40-C", which was included as a part of the Financial Year (FY) 1940 aircraft procurement program.