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).
Table of magneto distributor dimensions, make ratios, and ranges, expressed in fractional values of the distributor pitch.
Identifier | ExFiles\Box 4\5\ 05-page206 | |
Date | 24th June 1921 | |
X 430 X.430. TABLE OF MAGNETO DISTRIBUTOR DIMENSIONS, MAKE RATIOS, AND RANGES X 800 EXPRESSED IN FRACTIONAL VALUES OF THE DISTRIBUTOR PITCH IN EACH CASE. | Magneto. | Type. | Width of carbon brush. | Width of segment. | Sum of brush & seg: | Make ratio. | Sum of make ratio, brush & segment. | Range. | Forward overlap at advance. | Forward overlap at retard. | Backward overlap at advance. | Backward overlap at retard. | Remarks. | |---|---|---|---|---|---|---|---|---|---|---|---|---| | Watford. | E.6 | .15 | .62 | .77 | .86 | 1.63 | .17 | .14 | .31 | .49 | .32 | Standard. | | " | EO.6(a) | .15 | .61 | .76 | .91 | 1.67 | .18 | .15 | .33 | .52 | .34 | | | " | (b) | .16 | .62 | .78 | .89 | 1.67 | .35 | .08 | .43 | .59 | .24 | Extra long range (630). | | R.Bosch. | ZR.6 | .12 | .65 | .77 | .46 | 1.23 | .20 | .15 | .35 | .08 | -.12 | Long cams. | | U.S.A. Bosch | ZR.6 | .22 | .61 | .83 | .85 | 1.68 | .21 | .13 | .34 | .55 | .34 | | | " " | B.6 | .25 | .18 | .43 | ..86 | 1.29 | .20 | .03 | .23 | .26 | .06 | Jump spark distributor. | | " " | DUZ.6 | .20 | .61 | .81 | .87 | 1.68 | .19 | .13 | .32 | .55 | .36 | | | Conner. | CM.1 | .10 | .62 | .72 | .43 | 1.15 | .27 | .10 | .37 | .05 | -.22 | Long cams. | | B.T.H. | PM.6 | .26 | .25 | .51 | .56 | 1.07 | .25 | .01 | .26 | .06 | -.19 | Jump spark distributor. Medium cams | | Eisemann. | GN.6 | .18 | .55 | .73 | ..84 | 1.57 | .17 | .22 | .39 | .35 | .18 | 6 Stationary carbon brushes, and one revolving metal segment. | | Dixie | Aero 648. | .18 | .54 | .72 | .41 | 1.13 | .21 | .12 | .33 | .01 | -.20 | Polar Inductor machine. Long cams | | ||