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).
Aircraft engine performance, climbing capabilities, and comparisons with German equipment.
| Identifier | ExFiles\Box 182\M21\ img015 | |
| Date | 1st July 1917 | |
| To EH. from R.{Sir Henry Royce} 2. 250 - 270 HP this engine will give. As I have written to Lord Herbert Scott, I believe that the Germans are using a larger plane for the weight of their equipment and the horse power of their engines. Consequently, they will probably be able to climb higher than we can, with a smaller proportionate wing area. At moderate heights, however, our machines will probably be faster, but I doubt if this is a real advantage compared with the rate and height of climb, and ease of getting off the ground and landing. [Handwritten section 1] obtained & results though wrong area. See WW to find me a more efficient propeller they are using on the BH4 at the front ask them to let me know if there is anything special about the typed page. R.{Sir Henry Royce} If you think this little memo would interest Mr Walker send him a copy [Handwritten section 2] first seen 22/8/17 I have heard from two separate sources of improvements effected in the climb (at higher altitudes) of DH{D. Henderson - Showroom}4 with our 2-275 Eagles, when fitted with "Libbenham" propellers. I am also informed that they are made to the same drawings as the standard props for this engine. (4 bladed) Reliable information as to props. is not very easily obtained, but I hope to report more information shortly. D.H.4 have the reputation of being very good at the front for high altitude work (2-275 Eagles), can maintain & cruise at an altitude of 22,000 ft. Successful scouting & photographic work is now being done at this altitude (on their side?). EP{G. Eric Platford - Chief Quality Engineer} | ||