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).
Note outlining the threefold gain in speed from using exhaust momentum manifolds.
| Identifier | ExFiles\Box 134\1\ scan0045 | |
| Date | 7th December 1937 | |
| 1129 To Sg.{Arthur F. Sidgreaves - MD} & Hs.{Lord Ernest Hives - Chair} Copies Mr. [crossed out] Lr{Mr Ellor}/Lov.{Mr Lovesey} [crossed out] E/Dn. [crossed out] Rm.{William Robotham - Chief Engineer} Rg.{Mr Rowledge} [crossed out] Ds. [crossed out] Lp.{Mr Lappin} [crossed out] Lp.{Mr Lappin} [crossed out] Dor{Mr Dorey}/Pav.1/EKB. 7. 12. 37. [Handwritten] EDWARDS WYMAN } Please note -Ed{J. L. Edwards} Stans Rms Attached is a note on Exhaust Momentum, showing that the gain in speed using momentum manifolds, is threefold. At a speed of 300 MPH., these are :- 1. A gain of almost 6 MPH., due to a direct Momentum effect. 2. A gain of 3 MPH. with a fixed pitch, or 2-position airscrew, due to increased R.P.M. and boost. 3. A gain of 0 - 3 MPH., due to smoothing out the airflow over the aeroplane surface, i.e. improved streamlining. Total gain 9-12 MPH. Dor{Mr Dorey}/Pav. | ||