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 performance of a Lorraine-Dietrich engine on the test bench, with comparisons to the 20 HP and Goshawk engines.
| Identifier | ExFiles\Box 22\4\ Scan087 | |
| Date | 30th March 1927 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} X3588 Hs{Lord Ernest Hives - Chair}/ACL1/LG30.3.27. PERFORMANCE OF LORRAINE-DIETRICH ENGINE ON THE TEST BENCH. X5771 We have made a number of tests on the Lorraine Dietrich engine and obtained a fairly complete set of results giving the characteristics of this engine. In the results which follow we have, where possible, supplied for comparison the corresponding figures for the 20 HP. R-R and in some cases have computed curves from the original 20 HP. results to bring the two engines nearer the same basis and thereby render the results more comparable. For example the power output of the 20 HP. with a 5.9 to 1 compression ration has been computed from the std. curve for a 4.75 to 1 comp: ratio. The results obtained should prove useful as a basis of comparison for development tests on the Goshawk. These experiments were carried out on the test bench under the same conditions as existed for the Goshawk tests - i.e. the usual test bench silencing system was employed in both cases which at maximum power absorbs approx. 8-10 % of the total power given with free exhausts. This point is mentioned in order to avoid direct comparison with figures which at future times may be submitted for open exhaust tests on the 20 HP., as usually we conduct power development experiments with open exhausts. A description of the engine and review of the results obtained follow :- contd :- | ||