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).
Flywheel inertia calculations and design suggestions.
| Identifier | ExFiles\Box 130\3\ scan0124 | |
| Date | 28th February 1940 | |
| File 1110 NRS To. Ev.{Ivan Evernden - coachwork} & Jnr.{Charles L. Jenner} c. Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/NRC.{N. R. Chandler}9/AP.28.2.40. SPOONER Please WILTAN note. [Signature] Rm{William Robotham - Chief Engineer} RE: FLYWHEELS. Many thanks for Ev{Ivan Evernden - coachwork}/1 & 2/JH.23.2.40., With regard to the light wheel, B.60, Lucas, I agree I had slipped up in the arithmetic on the dimension 13.75 which would give an inertia of about 740 instead of 611. On the other hand, I think you will find the inertia of the rim shown on the blue print is nearer 587 instead of 611 as stated, and the attached sheet Fig.A. shows the working. Do you not think a rim of only .175 radial thickness is rather light? I suggest that if the bore is made 14.05 as shown in red, the rim would look more substantial, and the gain in inertia would be 6% for only ½lb. in weight, also, the total inertia would more nearly approach that of the 'Corniche', with a very slight saving in weight. As a matter of interest, I tried the effect of 'panneling' out the section 'c', Fig.B, which is correct from an idealistic point of view, but the gain in weight-inertia ratio is so small that I do not think the extra cost of machining would be justified. Hs{Lord Ernest Hives - Chair}/NRC.{N. R. Chandler} NRS | ||