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).
Specifications for various steering systems.
| Identifier | ExFiles\Box 154\3\ scan0008 | |
| Date | 28th January 1927 | |
| Oy2-E-12827 X3682 January 28th, 1927. To: Mr. Nadin cc: Mr. Haldenby Mr. Hives Mr. Hulley Mr. Ainsworth Mr. Caswell Mr. Soutter Mr. Beaver Mr. Southern Mr. Burton Mr. Bagnall From: Mr. Olley STEERING - SECTION 7050 Following particulars of steerings will be convenient for reference:- (Note that R.H. drive cars have R.H. thread and L.H. drive cars L.H. thread) Type of Steering Pitch line diameter Overall ratio steering wheel to front wheel at centre position. Helix angle of thread at pitch line "Pressure Angle" of thread Original 40/50 (S start) 1.218" 9.46 (17" wheel) 16° 23' 14-1/2° 40/50 2 Start Springfield 1.218" 14.20 (17" wheel) 10° 56' 14-1/2° Orig. English Phantom (1.125 lead) 1.400" 10.81 (17" and 18" whl.) 14° 20' 20° Improved Eng. Phantom (.940" lead) 1.400"(?) 12.90 (17" and 18" whl.) 12° 5' (?) 20° (?) 1701 New type Phantom steering with old type front axle (8" side steering lever) 1.800" 12.90 (18" wheel) 7° 15' 14-1/2° 1766 New type Phantom steering with front brakes (also on latest English chassis) 1.800" 15.20 (18" wheel) 7° 15' 14-1/2° | ||