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).
Resonance and booming issues of the Phantom III 33 gallon petrol tank.
| Identifier | ExFiles\Box 95\4\ scan0197 | |
| Date | 8th January 1936 | |
| To E.{Mr Elliott - Chief Engineer} Copy to Ba. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X351 E/Ev.{Ivan Evernden - coachwork}5/MN.8.1.36. file Bowering Phantom III. 33 Gallon Petrol Tank. We have had the opportunity of examining one of the latest Phantom III 33 gallon petrol tanks with the latest stiffened baffles. This tank appears to be a great improvement over the one which we made for the last 10,000 miles test car. There are no local areas of the tank which are more resonant that the rest, but the whole tank, apparently due to the thinner gauge, has a lower resonant note than the thick gauge 28 gallon tank which we have used previously, whilst the 25 H.P. tank has a still higher note. The pitch of the resonant note of the tank may be all important as we know that the lower the frequency the more likely it is for booming to be experienced. Now that the baffles have been stiffened they themselves will have a very high period and the low note comes from the vibration of the body as a whole, in which case some advantage might be gained by the use of dampers on the outside of the tank consisting of a thin steel strap having a lining of some vibration absorbing material. Ev.{Ivan Evernden - coachwork} Chup instructed | ||