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).
Modifications to a 20/25 hypoid rear axle, strengthened to take a 4 1/4 litre J3 engine.
| Identifier | ExFiles\Box 102\4\ scan0091 | |
| Date | 17th April 1935 | |
| To DY.{F R Danby} Copy to Wor.{Arthur Wormald - General Works Manager} H.{Arthur M. Hanbury - Head Complaints} Hs.{Lord Ernest Hives - Chair} HDY.{William Hardy} RHO. ------------------ x502 Da.{Bernard Day - Chassis Design}1/MN.17.4.35. P GRY{Shadwell Grylls} Imagine this puts this axle back about two months Re J3 Hypoid Rear Axle on 20/25. Since the 20/25 Hypoid rear axle did two 10,000 miles in France it has been strengthened to take the 4 1/4 litre J3 engine. As a result the flanges of the axle tubes are larger than the 20/25 and so are the axle driving shafts. This means that axle tubes are required which have the J3 flanges for attachment to the centre casing, and 20/25 outer ends for carrying the hubs, brakes, etc. Also driving shafts of 20/25 size are needed to go into the 20/25 hubs, but the differential wheel ends must suit the J3 centre casing. We have shown this on N.Sch.4462, which will enable the tubes and driving shaft to be got going. It appears to be perfectly possible to turn the new tubes out of the existing 20/25 forgings. We may send some further information as to the pinion thrust bearing in the course of a short time. The gears we require ordering are 9/41 ratio, viz: G54233. G 54463. De | ||