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).
The width of the back axle and frame for the 'Goshawk 11' chassis.
| Identifier | ExFiles\Box 75\3\ scan0309 | |
| Date | 25th January 1921 | |
| R.R. 285A (100 T) (S.H. 798. 10-12-20) G 2947 X4260 To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ. c. to Wor.{Arthur Wormald - General Works Manager} c. to Hs.{Lord Ernest Hives - Chair} c. to EFC. E1/G25.1.21. X.4260. RE "GOSHAWK 11" - WIDTH OF BACK AXLE AND FRAME. We send you herewith drawing LeC.1336 shewing on what grounds it is impossible to increase the width of the frame at the rear of "Goshawk 11" to a dimension greater than 34". I believe Mr. Royce has written to you about his decision to employ wire wheels on this chassis in preference to Michelin disc wheels, since the latter have not promised to be an entire success, and as you know, the wire wheels require more room, that is to say, the brake drums and steering pivots must be pushed further in. On LeC.1336 we have made up a rie wire wheel from 40/50 HP. information. the hub has been drawn in to suit the road wheel ball bearings shewn for "Goshawk 1", and is otherwise about .8 of the 40/60 H.P. wire wheel hub. We shall probably have to use some standard hubs, and Mr. Royce would be glad if you could get information as to what these will be like, so that the outer ends of the back axle can be designed, for which I believe he wishes you to make a scheme. the brake drum should be 14" diameter x 2.75" wide. This will allow brake shoes of about 1¼" wide. An inspection of LeC.1336 will reveal that there is a little spare room, but not enough to allow of an addition of 2" to the frame width. if at any time it was thought desirable to decrease the track a little, it could Contd. | ||