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).
The comparative test results for Lucas C.575, E.575, A.400 and Smith Type 2D dynamos.
| Identifier | WestWitteringFiles\E\June1920\ Scan9 | |
| Date | 18th June 1920 | |
| ORIGINAL. For complete set of curves see X. 3936. To R.{Sir Henry Royce} from EFC. c. CJ. c. Bm. c. E.{Mr Elliott - Chief Engineer} c. EP.{G. Eric Platford - Chief Quality Engineer} c. Hs.{Lord Ernest Hives - Chair} c. Wd.{Mr Wood/Mr Whitehead} c. PN.{Mr Northey} c. Bv. c. Pa{Mr Paterson} EFC1/T18.6. O.{Mr Oldham} X.4080 - LUCAS C.575 DYNAMO. X.314s. - LUCAS E.575 DYNAMO. X.295. - SMITH TYPR 2D DYNAMO. X.3936 Further to our EFC1/T17.6.20, we have now to report complete results of comparative tests of the above dynamos. Curves sheet A give the open circuit volt-speed relations for cold and hot conditions for the above three dynamos, together with similar relations for the Lucas A.400 39 1/4 lb. dynamo. A feature of these curves to be noticed is that on the 4-pole machines the gradient is steeper. Otherwise the lines for different dynamos, and for hot and cold conditions, are practically parallel. This at any rate would be expected between the cold and hot condition of any one machine, as the principal difference is due to the increased resistance of the field winding. Curves sheet B giving the comparative outputs in the hot and cold condition for the E.575 and C.575 machines have already been issued to you, with the necessary remarks, under cover of our EFC1/T29.5.20. Curves sheet C give the comparative outputs of Smith dynamos types A and 2D, for the cold and hot conditions. Contd. R.R. 199 (2501) (SD67649-7-17) MP180865 | ||