Research Document #20
“Lockheed Report 487: Range Study of Lockheed Electra Bimotor Airplane”
by C.L. Johnson, June 19, 1936. [PDF]
This document is provided on this web site as a matter of general interest and to aid in research by individuals. No permission to reproduce it or transmit it is implied or granted.

This range study of the Lockheed 10E includes performance graphs and much technical information about the aircraft. It is, nonetheless, a marketing document. Written by Clarence L. “Kelly” Johnson, later of the famed Skunk Works, it is determinedly optimistic in its assumptions and judgments. This is the Index:

  1. Introduction
  2. Summary and Recommendations
  3. Discussion
  4. Discussion of Curves Derived
  5. Additional Data
  6. Conclusions
  7. Flight Procedure Data
  8. Effect of Head and Tail Winds
  9. Various Curves on Range Performance
  10. Take-off Curves and Effect of Wing Flaps
  11. Normal Airplane Cruising Charts
  12. Engine Power Curves
  13. Appendix and Computations

Note: this is a transcription/facsimile document, not an original. The text is searchable. Pages 17 & 18, “Engine Power Curves,” are missing from the original microfilm document from which this PDF was made. If we can find them in another source they will be added.

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