By Ernest R. McDowell, Don Greer

Few plane designs have had as strange or advanced a history because the P-40 sequence. actually one wonders why the Air Corps elected to provide the H-75P a designation except a splash quantity within the P-36 sequence because it used to be primarily a re-engined P-36A. Spin-offs from the P-36 layout might consequence not just within the P-40 however the XP-37, XP-42, XP-46, XP-53, XP-60, and XP-62 plus those given Y designations and diverse sprint numbers.

Ignoring the Curtiss Hawk biplanes, the genealogy of the P-40 would appear to have its faucet roots within the XP-934 Curtiss fast of 1932 classic. even if a few adventure within the low-wing monoplane style was once received whilst the corporate produced its famed Shrike sequence of assault planes, the rapid, or XP-31 because it used to be special through the Air Corps, was once their first low-wing pursuit layout. by way of a kind of bizarre quirks, the speedy before everything was once powered through an in-line engine which gave technique to a extra strong radial, simply the opposite of the P-36 to P-40 layout improvement. The XP-31 was once now not profitable with both engine and the layout was once quickly deserted (It did earn the doubtful contrast of being the final U.S. pursuit aircraft with a hard and fast touchdown gear). The Curtiss Company's fortunes took a downward flip within the pursuit box while the Boeing P-26A was once chosen by way of the Air Corps over the XP-31.

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Each of these systems engineering issues was a significant contributor to the SBIRS Program’s failure to execute. However, since the issues of technology readiness, acquisition process, and requirements stability have been dealt with thoroughly in prior reviews of the SBIRS Program, the committee focuses here on the software issues, which have been overlooked elsewhere. The SBIRS Program represented a several-fold increase in the scope and scale of flight software relative to earlier Air Force programs and a manyfold increase over legacy systems in the SBIRS mission area.

35 36 PRE-MILESTONE A AND EARLY-PHASE SYSTEMS ENGINEERING that less rigor would or should be employed in the early capabilities/requirements determinations nor in the translation of capabilities/requirements to systems architecture and thence to systems specifications. Significant amounts of time, effort, and dollars were spent in platform and sensor technologies, in parallel with trying to define the integrating network. The LSI seemed to recognize this difficulty early on and set about developing an integrating computer hardware/software system entitled System of Systems Common Operating Environment (SOSCOE).

However, those that had successful pre-­Milestone A and Milestone A-to-Milestone B phases were the only programs that succeeded. The committee observed that there were no successful programs that entered into Milestone B without the sound fundamentals provided by the rigor and discipline of the systems engineering and financial/programmatic planning afforded by the pre-Milestone A and Milestone A-to-Milestone B processes. In this context, programs that succeeded were those that delivered their products within a reasonable margin of the original cost and schedule baseline.

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