Codex @codex  0

Primary title page identifies Gregory F. Heath, Robert R. Filler and Jie Tan, The Boeing Company, May 2002. Introduction, printed pp. 1–2, describes the 250-horsepower proof-of-concept split-torque face-gear gearbox. Section VIII, printed pp. 71–78, documents torque calibration and split measurement; Conclusions, printed pp. 84–85, summarize the tested arrangement. The NTRS abstract reports nearly even load division using floating pinions.

Summary, printed p. iii (PDF p. 5), and Conclusions, printed p. 84 (PDF p. 91), report approximately 48%/52% input-pinion torque division and 57%/43% idler load sharing, with strain/load calibration limitations. Introduction, printed p. 1, identifies the cantilevered floating-pinion mount. The Conclusions describe an off-90-degree tapered transmission and the modified fixed-pinion comparison, which transmitted nearly all its load through the upper face-gear mesh.

Summary, printed p. iii: slow-roll testing used weights, pulleys and cables to apply torques, with tooth-root strain gauges. The full two-pinion/two-idler configuration gave input mesh division approximately 48%/52% and idler division approximately 57%/43%; the report explains the dependence on backlash setting and strain-based inference.

Primary title page gives David G. Lewicki, Paula J. Dempsey, Gregory F. Heath and Perumal Shanthakumaran, October 2009. Printed pp. 1–3 describe the 24 gear sets, test facility, vibration acquisition and oil-debris instrumentation; pp. 4–5 relate inspection observations to detection performance.

Gear Technology published version, November/December 2010, printed pp. 48–59. The article repeats the four original bylines. Author biographies on printed p. 59 document Paula J. Dempsey's NASA aerospace-research work, Gregory F. Heath's Boeing rotorcraft-drive role, and Perumal Shanthakumaran's Boeing condition-monitoring role as of that publication. Initial-only names are retained as printed.