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Data table showing efficiency ratios from starter motor tests.

Identifier	ExFiles\Box 64\1\ scan0275
Date	14th June 1928

STARTER MOTOR TESTS. FORM 5. EFFICIENCY RATIOS. C2 2s 2p \| C \| ϕE \| ϕe \| ϕB \| ϕT \| ϕe {Mr Elliott - Chief Engineer} /ϕE = es/E \| ϕT/ϕB = Tr {Capt. F. W. Turner - Finance} /Ts \| ϕT/ϕE = η \| ϕB/ϕe \| \|-----\|-----\|-----\|-----\|-----\|--------------\|---------------\|-----------\|-------\| \| 20 \| \| \| \| \| \| \| \| \| \| 30 \| \| \| \| \| \| \| \| \| \| 40 \| \| \| \| \| \| \| \| \| \| 50 \| 118 \| — \| 88 \| 26 \| .745 \| .296 \| .220 \| — \| \| 60 \| 126 \| — \| 94 \| 36 \| .745 \| .383 \| .286 \| — \| \| 80 \| 139 \| — \| 108 \| 55 \| .778 \| .509 \| .395 \| — \| \| 100 \| 155 \| 141 \| 118 \| 73 \| .762 \| .618 \| .471 \| .837 \| \| 120 \| 169 \| 152 \| 126 \| 85 \| .746 \| .674 \| .502 \| .829 \| \| 140 \| 189 \| 163 \| 130 \| 95 \| .688 \| .730 \| .503 \| .797 \| \| 160 \| 205 \| 174 \| 134 \| 103 \| .654 \| .768 \| .502 \| .770 \| \| 180 \| 222 \| 180 \| 137 \| 108 \| .617 \| .788 \| .487 \| .761 \| \| 200 \| 244 \| 187 \| 140 \| 112 \| .573 \| .801 \| .458 \| .748 \| \| 220 \| 271 \| 194 \| 142 \| 117 \| .524 \| .823 \| .432 \| .732 \| \| 240 \| 312 \| 200 \| 145 \| 120 \| .465 \| .828 \| .385 \| .725 \| 14.6.28.

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).