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).
Comparison table of armature windings for S.S. Motors.
| Identifier | ExFiles\Box 68\4\ scan0195 | |
| Date | 26th April 1917 | |
| -2- TABLE OF ARMATURE WINDINGS ( S.S. MOTOR) (Contd) Machine. | R.R.45A. | R.R.17 | R.R.24 | Lucas A.510 | C.A.V. | Bosch. | Bijur 6 volt. ---|---|---|---|---|---|---|--- step. Winding pitch in slots. | 11 coil 12 com. | 4 coil 4 & 5 com. | 6 coil 5 & 6 com. | 10 11 | 5 6 | 11 10 | 5 6 Armature dimensions. | 3⅜" x 2¼" | 3⅜" x 2⁹/₁₆" | 3⅜" x 2⁹/₁₆" | | 2.90"x 2.85" | 3¹¹/₁₆" x 2¾" | 3.55 x 3.00 Commutator dimensions. | 2⁷/₁₆" x 1¼" | 2⁷/₁₆ x 1¼" | 2⁷/₁₆ x 1¼" | | 1.75"x 1.15" | 2⅛" x ⅞" | 2.00 x 1.20 Brush contact area. | 1.00"x .4" | 1.00"x .4" | 1.00"x .4" | .60 x .25 | | | 1 x 1.00"x .25" Armature resistance at 15° C. | .0114 | .0150 | .0195 | .00845 | .00864 | .00952 | .00157 Top right corner text: R.R. 63 (50 T) (S.D. 40A. 26-4-17) Bm. 2/55/14. | ||