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).
Proposal for mounting a spare wheel carrier on an armoured car, discussing dimensions and clearances.
| Identifier | ExFiles\Box 20\10\ Scan016 | |
| Date | 2nd December 1920 | |
| X.4195 To BY from DA.{Bernard Day - Chassis Design} Copy to Mr H (1 print). Copy to TE (1 print). Copy to Mett (1 print). Copy to DFO. DA{Bernard Day - Chassis Design}5/CB2-12-20. DEC 2 X.4195 Armoured Cars - Spare Wheel Carrier. -------------------------------- RECEIVED Replying to your BY/C6/11-12-20. we send herewith two prints of "R" Scheme 668 shewing the spare wheel carrier we propose when mounted on the armour. We are not sure whether this is what Col. Hutchinson is thinking of, and we are not sure whether we quite understand what his wishes are, as expressed in your note. He appears to require the wheel to rest on the ditching board, but at the same time to be carried off the armouring. We do not think it would be possible to do both with any sort of certainty. Accordingly we have shewn the wheel carried off a spigot on the spare wheel carrier, and thus this weight is carried by the armouring. The dimension is such that provided the running board is 1 3/4" thick, and provided the depth from the bottom of the running board to the top of the ditching board is 5", as given on the latest armour plate drawing, and provided that the wheels are to size, and provided the holes in the armouring come in right, the circumference of a fully inflated tyre will just touch the ditching board. If this is thought to be impracticable, as we are rather inclined to think, then we suggest that either the dimension given as 4" should be increased to 4.25 or 4.5, or else that the spigot should be taken off the carrier bracket, and the wheel should be definitely pushed down on to the ditching board each time. Contd. | ||