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).
Body stiffness modifications and measurements for a Coupé model.
| Identifier | ExFiles\Box 117\2\ scan0055 | |
| Date | 21th July 1939 | |
| -3- (4) Coupé after stiffening mods. carried out by Park Ward - No chan. (5) Coupé with diagonal strut across scuttle between door pillars - .000" (6) Coupé with stiffened door pillars doors shut - .004" (7) Coupé as (6) but with additional struss from top of dash to front pan - .003" (8) Coupé as (7) but with door catches solid, rubber removed - .002" The saloons are so stiff that the above method of measurement gives no result. The effect of increasing the stiffness on the coupé from .005" to .003" is to raise the frequency of the shake without decreasing the amplitude. It is clear that we shall not have to double the stiffness, but to increase it say 10 times if we are to affect an improvement. As previously mentioned, the coupé in condition (5) did not shake. The strut in question was not very stiff, it whipped when on the road. Further alterations to be made. From calculations made by Mr. Bower it would seem that if we are to increase the stiffness to .0005" we shall have to make the following structure:- (1) Door pillars about 2½" square up to screen level. (2) Door pillars solid with frame, and the frame stiffened locally. (3) Door pillars joined by a beam immediately behind facia board about 6" deep. Beam welded to pillars. | ||