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 specifications for various steering system conversions, aiming to resolve complaints.
| Identifier | ExFiles\Box 68\1\ scan0056 | |
| Date | 1st May 1928 | |
| 40/50 CONVERSIONS FOR COMPLAINTS AIMING AT OVER-ALL RATIO OF 15/1. 1/5/28 TABLE DATA: COLUMN HEADERS: 1: SERIES V 2: ORIGINAL CONVERSION 3: CONVERSION FOR STEERING COLS: 1 AND 2 4: 'B' 2 5: CONVERSION FOR 'B' 2 SERIES 6: 'F' 2 7: CONVERSION FOR 'F' 2 SERIES 8: 14 EX. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. 7 ROW DATA: LEAD: 1.125 | .940 | .825 | .720 | .720 | .720 | .720 | .720 PITCH DIA: 1.400 | 1.400 | 1.400 | 1.800 | 1.800 | 1.800 | 1.800 | 1.800 HELIX ANGLE: 14°-20' | 12°-4' | 10°36' | 7°15' | 7°15' | 7°15' | 7°15' | 7°15' N° OF STARTS: 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 ANGLE OF CUTTER: 29° | 29° | 29° | 29° | 29° | 29° | 29° | 29° ROCKING LEVER: 2.300 | 2.300 | 2.300 | 1.750 | 1.750 | 1.750 | 1.750 | 1.500 PENDULUM LEVER: 9.500 | 9.500 | 9.500 | 9.500 | 11.000 | 11.000 | 10.0 | 7.500 SIDE STEERING LEVER: 8.000 | 8.000 | 8.000 | 8.000 | 9.225 | 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° | L.38° R.32° | L.38° R.32° | L.38° R.32° | L.38° R.32° LEVERAGE: 11/1 | 13.6/1 | 15/1 | 13/1 | 13/1 | 13/1 | 14.3/1 | 16.5/1 TURNS OF WHEEL: 2 | 2.4 | 2.65 | 2.2 | 2.250 | 2.250 | 2.350 | 3.000 SPECIFICATIONS (BOTTOM SECTION): COLUMN 1 (SERIES V): S.S. TUBE USED: F.5007 SPRING RATING: F.4614 MAXIMUM MOVEMENT: 3,500LBS STRESS: .250" TRAVEL COLUMN 2 (ORIGINAL CONVERSION): S.S. TUBE USED: N.Sch. 2258 F.76787 SPRING RATING: F.76726 MAXIMUM MOVEMENT: 1500 LBS/1" STRESS: .600 84,500 COLUMN 3 (CONVERSION FOR STEERING COLS: 1 AND 2): S.S. TUBE USED: N.Sch. 2258 F.76787 SPRING RATING: F.76726 MAXIMUM MOVEMENT: 1500 LBS/1" STRESS: .600 84,500 NOTE: THE VERY LOW RATIO MAY REQUIRE A SIDE STEERING TUBE END MODIFICATION TO PREVENT EXCESSIVE SPONGINESS. COLUMN 4 ('B' 2): S.S. TUBE USED: F4614 MAXIMUM MOVEMENT: 3,500LBS STRESS: .250" COLUMN 5 (CONVERSION FOR 'B' 2 SERIES): S.S. TUBE USED: N.Sch. 2258 F.76726 MAXIMUM MOVEMENT: 1500 LBS/" STRESS: .600 84500 NOTE (Vertical): A NUMBER OF DISSATISFIED OWNERS NOT LARGE. SHORTER PENDULUM LEVERS CANNOT BE FITTED. IN EXCEPTIONAL CASES THEREFORE USE COL:3 CONVERSION. COLUMN 6 ('F' 2): S.S. TUBE USED: N.Sch. 2258 F.76787 F.76726 MAXIMUM MOVEMENT: 1500 LBS/1" STRESS: .600 84,500 COLUMN 7 (CONVERSION FOR 'F' 2 SERIES): S.S. TUBE USED: N.Sch. 2258 F.76787 F.76726 MAXIMUM MOVEMENT: 1500 LBS/1" STRESS: .600 84,500 COLUMN 8 (14 EX. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. 7): S.S. TUBE USED: F.76108 F.76110 SPRING RATING: 1400 LBS/1" MAXIMUM MOVEMENT: .400 STRESS: 84,100 | ||