The moment of inertia for a lightened B.T.H. aero magneto rotor.
| Identifier | ExFiles\Box 43\4\ Scan117 | |
| Date | 17th April 1928 | |
| To R. {Sir Henry Royce} from EFC. {E. Fowler Clarke - Electrical Engineer} c. BJ. E. {Mr Elliott - Chief Engineer} c. EX. RG. {Mr Rowledge} X4021 EFC {E. Fowler Clarke - Electrical Engineer} 2/T17.4.28. X3832/ MOMENT OF INERTIA OF LIGHTENED B.T.H. AERO MAGNETO. A lightened B.T.H. rotor similar to those provided in the two lightened B.T.H. type SC12-7 aero magnetos which we reported upon in EFC {E. Fowler Clarke - Electrical Engineer} 6/T4.4.28 was loaned to us by the B.T.H. Co. for the purpose of taking its moment of inertia. This we have done and the result, inclusive as before, of half the moment of inertia of the spring drive, is 1.37 lb-inches2. This is to be compared with the previous results given in our EFC {E. Fowler Clarke - Electrical Engineer} 2/T10.12.27, viz :- Watford rotor 1.01 lb-inches2 B.T.H. " (unlightened) 1.48 lb-inches2. EFC. {E. Fowler Clarke - Electrical Engineer} | ||
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).