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).
Proposed modifications to the subframes for two chassis types.
| Identifier | ExFiles\Box 15\4\ Scan041 | |
| Date | 1st February 1929 | |
| BY.{R.W. Bailey - Chief Engineer} from DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} c. to Hs.{Lord Ernest Hives - Chair} DA{Bernard Day - Chassis Design}/EV{Ivan Evernden - coachwork}6/M5. 2. 29. RE. SUBFRAMES. As a result of our experience with the mounting of SS.{S. Smith} and India bodies we agree to the following modifications to the subframes of both chassis. (1) Owing to the upsweep of the frame at the rear having considerable variations we suggest the rear supporting bracket on the frame be fitted, at a given height above the level top of the frame, but at a fixed dimension below the top of the frame at the centreline of the bracket. This should assume that the top of the subframe is always slightly above the top of the chassis frame - see section A-A on F.79576. (2) We agree to the clearance between the chassis frame and the main frame being increased to 1". The front ends of the subframe cannot be moved. The brackets will need lengthening. (3) We agree to packing being provided under the front as well as the rear supports to enable the dash to be matched up with the scuttle - (we believe we have already instructed this). (4) We agree to a slotted hole being provided in the centre support bracket on the subframe as well as the large clearance hole in the chassis frame. We also agree to the bracket remaining as at present and the effect of (2) being to make the packing washer .400" thick. We suggest that this packing be made up of plate washers about .060" thick, and that with each subframe an excess of these be supplied. These remarks apply to both chassis. Would Derby please put these modifications in hand. (5) We shall set out a coachbuilder's print of the subframe telling how to use it, profitting by our experience with the experimental bodies. We shall expect Derby to add to this print as information comes through. (6) We do not wish to have to provide a detachable front cross member to the subframe, unless it is absolutely necessary. We agree that the gearbox must be capable of being removed without removing the unit. This would appear possible if the front end of the body were raised an inch or two by slackening the supporting bolts and jacking up. The instrument board connectings need not be disturbed. We should be glad if Hs.{Lord Ernest Hives - Chair} will tell us whether this can be done. DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} | ||