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).
Chart detailing steering conversion specifications for complaints, aiming for a 15/1 over-all ratio.
| Identifier | WestWitteringFiles\S\March1928-May1928\ Scan171 | |
| Date | 1st May 1928 | |
| 40/50 CONVERSIONS FOR COMPLAINTS AIMING AT OVER-ALL RATIO of 15/1. TABLE DATA: Column Headers (L-R): 1, 2, 3, 4, 5, 6, 7, 8 Column Sub-headers: V, ORIGINAL CONVERSION, CONVERSION FOR STEERING COLS: 1 AND 2, 'B' 2, CONVERSION FOR 'B' 2 SERIES, 'F' 2, CONVERSION FOR 'F' 2 SERIES, 14 EX. E.A.C.7 Row Data (values per column): SERIES: V, , , , , , , LEAD: 1.125, .940, .825, .720, [Note], .720, .720, .720 PITCH DIA: 1.400, 1.400, 1.400, 1.800, [Note], 1.800, 1.800, 1.800 HELIX ANGLE: 14°-20', 12°-4', 10° 36', 7° 15', [Note], 7° 15', 7° 15', 7° 15' Nº OF STARTS: 4, 4, 4, 3, [Note], 3, 3, 3 ANGLE OF CUTTER: 29°, 29°, 29°, 29°, [Note], 29°, 29°, 29° ROCKING LEVER: 2.300, 2.300, 2.300, 1.750, [Note], 1.750, 1.750, 1.500 PENDULUM LEVER: 9.500, 9.500, 9.500, 9.500, [Note], 11.000, 10.0, 7.500 SIDE STEERING LEVER: 8.000, 8.000, 8.000, 8.000, [Note], 9.225, 9.225, 9.500 LOCK ANGLES: L.H. 38° R.H. 32°, L.38° R.32°, L.38° R.32°, L.38° R.32°, [Note], L.38° R.32°, L.38° R.32°, L.38° R.32° LEVERAGE: 11/1, 13.6/1, 15/1, , [Note], 13/1, 14.3/1, 16.5/1 TURNS OF WHEEL: 2, 2.4, 2.65, 2.2, [Note], 2.250, 2.350, 3.000 Bottom Section Data (per column): Col 1: S.S. TUBE USED: F.5007 SPRING RATING: F.4614, 3,500LBS/i" MAXIMUM MOVEMENT: .250" TRAVEL Col 2: S.S. TUBE USED: N.SCH. 2258, F.76787 SPRING RATING: F.76726, 1500 LBS/1" MAXIMUM MOVEMENT: .600 STRESS: 84,500 Col 3: [Note] Col 4: S.S. TUBE USED: F.4614 SPRING RATING: 3,500LBS/i" MAXIMUM MOVEMENT: .250" STRESS: -2.50" Col 5: Data: N.SCH. 2258, F.76726, 1500 LBS/", .600, 84,500. Col 6: Data: N.SCH. 2258., F.76787, F.76726, 1500 LBS/", .600, 84,500 Col 7: Data: N.SCH. 2258., F.76787, F.76726, 1500 LBS/1", .600, 84,500. Col 8: Data: F.76108, F.76110, 1400 LBS/1", .400, 84,100 --- NOTES --- Note in Column 3: "THE VERY LOW RATIO MAY REQUIRE A SIDE STEERING TUBE END MODIFICATION TO PREVENT EXCESSIVE SPONGINESS." Note in Column 5 (Vertical): "IN EXCEPTIONAL CASES WHERE OWNERS ARE DISSATISFIED, SHORTER PENDULUM LEVERS CANNOT BE FITTED, THEREFORE USE COL:3 CONVERSION." | ||