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).
List of advantages for the 'X' Series design focusing on parallel control of axles to make it more like the 20 HP model.
| Identifier | ExFiles\Box 101\1\ scan0013 | |
| Date | 9th May 1925 | |
| (5420) To CJ. Hs.{Lord Ernest Hives - Chair} RG.{Mr Rowledge} Wor.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} LHS.{Lord Herbert Scott} DA.{Bernard Day - Chassis Design} PN.{Mr Northey} } FROM R.{Sir Henry Royce} R3/M9.5.25. 45-HP. 'X' SERIES. <s>PARALLEL CONTROL OF AXLES TO MAKE IT</s> X.5770 STILL MORE LIKE 20 HP. X.5420 (These papers are to be sent to CJ. confidentially to be distributed if, and when, he thinks proper. They indicate the chassis work in hand. There is little now to do to the 20 HP. which seems satisfactory.) ADVANTAGES. (1) Torque reaction dithers due to backward drive and forward braking are overcome - make more effective braking. (2) Transmission knocks avoided. (3) Fabric coupling has longer life, and less need for fabric coupling. (4) Lighter back axle. (5) Improved sideways control to the rear of car. (6) Lower frame. (7) Constant angular velocity of the road wheels - probably improved tyre wear. (8) Rear of frame is a stiffer base for the body. (9) Admits of an underframe without raising the floor to 3". (10) Permits of a good design of battery in the frame. (11) Automatically provides a protection for the petrol tank. (12) Spare wheel can be carried at the rear. (13) A strong luggage carrier can be readily designed. (Diagonal stays to sphere) (14) Drawbars are not needed, there is one cross member less, and the rear of chassis is cleaned up. (15) Improved road holding qualities. (16) Total weight and cost reduced. (17) } Increase track to 58", increasing width of radiator and with increase depth - i.e. 1" each way and fan increased from 23" to 24" gives a gain of 10% of both rad. and fan. A little may be more than we think: Hs.{Lord Ernest Hives - Chair} believes EAC. will as 'V' seires be a great improvement. (Handwritten note for 17: Independent items but much more economical at same time.) (18) Front axle changed to new 20 HP. type. contd :- | ||