From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Notes and specifications for the Goshawk dynamo.
| Identifier | ExFiles\Box 51\1\ Scan385 | |
| Date | 5th June 1924 | |
| X 4383 5.6.24. GOSHAWK DYNAMO NOTES. X 4363 X 4383 Expl. Std. and thick carcase armatures. Resis. std. .347 ohm "Th.C" .365 ohm. Diff. .018 ohm Ratio 1.05. Armature active length, standard 2.8" (helically), Th.C. 2.75". Gos. dynamo brush current-density. Area = .75" x .3" = .225 sq.". Main current (+) ~about 16 A .`. Density about 70A/sq." Gos. dynamo pressed brush-gear, clearance from comm. by drawing - .075" Ditto Scintilla on actual machine (2057) approx. .125". First Gos. dynamo with retarded comm. No.383. Goshawk brush spans. On one coil per slot machine .3"(main)= 1.32 segments. " " " " " .2"(control)= .88 " " two " " " " .3"(main) = 2.59 " " " " " " .2"(control &) 1.73 " (modifd.main) " " " " " .125"(modif'd) 1.08 " (controb) Goshawk pole-shoe displacement. .25" of pole-shoe, equiv. to .374" on carcase (for brush adjustment). Goshawk 2 coil/slot brush position is 3.5o less retarded than std. 29 segment arm: = 3.5o more than old 29 segment. Correct std. brush (main) position on Gos. dynamo. Contd. | ||