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).
Frame deflection measurements on the Goshawk 11 and proposing modifications.
| Identifier | WestWitteringFiles\K\September1923\ Scan112 | |
| Date | 20th September 1923 | |
| R.R. 235a (100 T) (S H.{Arthur M. Hanbury - Head Complaints} 159 1-S 20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 ORIGINAL TO HS.{Lord Ernest Hives - Chair} FROM DA.{Bernard Day - Chassis Design} DA{Bernard Day - Chassis Design}2/M20.9.23. RE. FRAME DEFLECTIONS. 44260 With reference to the diagram shewing frame deflections on Goshawk 11. with and without tie-bars, we should like you to confirm the figures shewn on the diagram, especially those in which there is a reversal of sign. We find it very difficult to believe that there can be a reversal of sign in the way indicated, and we should be much obliged if you would give us very full particulars of this, that is, how the deflection is measured, etc. Assuming that the figures given are correct we should then like you to try some modifications:- (1) Put the rear king post in the tie-rods immediately underneath the front rear spring bracket, or even a little behind it and run the rear tie-rod to a point close to the bumping position of the back axle. (2) Stiffen up the joggle part by means of a liner inserted. The object of this liner is principally to prevent the top and bottom flanges of the joggle portion distorting, and consequently it would probably consist of a flat plate with angles riveted along the top and bottom side and bolted or riveted to the side channel very near the inside edge. There was a similar scheme on Hawk-Northcliffe. As regards the deflection at the front end we should like you to ascertain how much, if any, is due to torsion on account of the side member being off-set in the plan view. If it were found that an appreciable amount of deflection was due to this cause we should then like to try reinforcing the front end of the frame against torsion, possibly by a box section too. Mr. Royce would also like you to carry the front tie-bar nearer the rear shackle of the front spring, in fact, as near as possible to it. DA.{Bernard Day - Chassis Design} | ||