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 performance comparing gear reduction, speeds, retractable undercarriages and flaps.
| Identifier | ExFiles\Box 173\1\ img165 | |
| Date | 22th January 1933 guessed | |
| II runs faster, & requires therefore a lower gear reduction, penalises it slightly for weight as a simple epicyclic cannot be used. I have no figures for the top speed of scouts interceptors fitted with double row radials but hope to get them in Washington. It may be difficult to compare them with our speeds as the retractable under carriage seems to be almost universal here. Frank Hawks usually has the last word in high speed machines & I understand his latest does 275 M.P.H which, if true, does not seem very flattering for the air cooled, as he flies an essentially freak machine. They talk a lot about flaps "here" reducing the landing speeds of these fast machines; apparently these are a type of air brake, similar in action to that of the puss moth, but fitted between the ailerons. | ||